Updated on 2026/04/05

写真a

 
ishihara tadashi
 
Organization
Institute of Integrated Research Multidisciplinary Resilience Research Center Professor
Title
Professor
External link

Research Interests

  • Nonstructural component

  • Uplift

  • Steel structure

  • Structural dynamics

  • Earthquake Engineering

Research Areas

  • Social Infrastructure (Civil Engineering, Architecture, Disaster Prevention) / Building structures and materials

Education

  • Tokyo Institute of Technology

    - 2000.3

      More details

    Notes: Doctor course Completed

    researchmap

  • Tokyo Institute of Technology

    - 1997.3

      More details

    Notes: Master course Completed

    researchmap

  • Tokyo Institute of Technology

    - 1995.3

      More details

    Notes: Graduated

    researchmap

Research History

  • Institute of Science Tokyo   Institute of Integrated Research   Professor

    2024.10

      More details

    Country:Japan

    researchmap

  • Tokyo Institute of Technology   Institute of Innovative Research   Professor

    2022.4 - 2024.9

      More details

    Country:Japan

    researchmap

  • National Institute for Land and Infrastructure Management   Building Dept.   Head

    2018.4 - 2022.3

      More details

  • Building Research Institute

    2011.4 - 2018.3

      More details

  • National Institute for Land and Infrastructure Management   Building Dept.

    2003.11 - 2011.3

      More details

  • National Institute for Land and Infrastructure Management   Building Department

    2002.11 - 2011.3

      More details

  • Ministry of Land, Infrastructure, Transport and Tourism

    2001.11 - 2002.10

      More details

  • Ministry of Land, Infrastructure, Transport and Tourism   Housing Bureau

    2001.11 - 2002.10

      More details

  • National Institute for Land and Infrastructure Management   Building Dept.

    2001.4 - 2001.10

      More details

  • Building Research Institute   Structural Department   Researcher

    2000.4 - 2001.3

      More details

▼display all

Professional Memberships

  • ARCHITECTURAL INSTITUTE OF JAPAN

    1995.3

      More details

  • JAPAN ASSOCIATION FOR EARTHQUAKE ENGINEERING

      More details

Committee Memberships

  •   Architectural Institute of Japan  

    2025.6 - 2027.5   

      More details

  •   Japan Building Disaster Prevention Association  

    2025.6 - 2026.3   

      More details

  •   Japan Building Disaster Prevention Association  

    2025.6 - 2026.3   

      More details

  •   Japan Building Disaster Prevention Association  

    2025.5 - 2026.3   

      More details

  •   Japan Association for Building Research Promotion  

    2025.5 - 2025.9   

      More details

  •   Architectural Institute of Japan  

    2025.4 - 2027.3   

      More details

  •   Architectural Institute of Japan  

    2025.4 - 2027.3   

      More details

  •   Japan Building Disaster Prevention Association  

    2025.4 - 2026.3   

      More details

  •   Center for Better Living  

    2025.4   

      More details

  •   Japan Building Disaster Prevention Association  

    2024.10   

      More details

  •   Center for Housing Renovation and Dispute Settlement Support  

    2024.8 - 2026.3   

      More details

  •   Building Maintenance & Management Center  

    2024.8 - 2025.8   

      More details

  •   Japan Building Disaster Prevention Association  

    2024.8 - 2025.3   

      More details

  •   株式会社 日本鉄骨評価センター 評価員  

    2024.7 - 2026.6   

      More details

  •   Japan Building Disaster Prevention Association  

    2024.7 - 2025.2   

      More details

  •   Public Buildings Association  

    2024.6 - 2025.8   

      More details

  •   Architectural Institute of Japan  

    2024.4   

      More details

  •   Architectural Institute of Japan  

    2024.3 - 2026.3   

      More details

  •   Japan Building Disaster Prevention Association  

    2023.9 - 2024.3   

      More details

  •   Japan Building Disaster Prevention Association  

    2023.7   

      More details

  •   (一社)茨城県建築士事務所協会 耐震診断補強計画判定会議 委員  

    2023.5 - 2026.3   

      More details

  •   全国鉄骨評価機構 鉄骨製作工場性能評価員  

    2023.3 - 2028.3   

      More details

  •   Japan Building Disaster Prevention Association  

    2022.9 - 2024.3   

      More details

  •   Center for Housing Renovation and Dispute Settlement Support  

    2022.8 - 2024.3   

      More details

  •   イントラスト株式会社 総合技術開発プロジェクト「建築物と地盤に係る構造規定の合理化による都市の再生と強靭化に資する技術開発」既存杭分科会 委員  

    2022.6 - 2024.3   

      More details

  •   Building Research Institute Visiting Research Fellow  

    2022.5 - 2026.3   

      More details

  •   The Building Center of Japan  

    2022.5 - 2025.3   

      More details

  •   Japan Building Disaster Prevention Association  

    2022.5 - 2024.3   

      More details

  •   Japan Building Disaster Prevention Association  

    2022.5 - 2024.2   

      More details

  •   Japan Building Disaster Prevention Association  

    2022.5 - 2023.3   

      More details

  •   The Japan Building Equipment and Elevator Center Foudation  

    2022.5 - 2023.2   

      More details

  •   Japan Building Disaster Prevention Association  

    2022.5 - 2022.9   

      More details

  •   Japan Building Disaster Prevention Association  

    2022.4 - 2026.3   

      More details

  •   Building Maintenance & Management Center  

    2021.10 - 2022.8   

      More details

  •   Public Buildings Association  

    2021.10 - 2022.8   

      More details

  •   Architectural Institute of Japan  

    2021.4 - 2023.3   

      More details

  •   Architectural Institute of Japan  

    2021.4   

      More details

  •   Architectural Institute of Japan  

    2020.6 - 2022.5   

      More details

  •   Architectural Institute of Japan Sub Committee on Innovative Design Standard of Steel Structure  

    2020.4 - 2024.3   

      More details

  •   Japan Building Disaster Prevention Association  

    2020.2 - 2025.3   

      More details

  •   Public Buildings Association  

    2018.10 - 2019.8   

      More details

  •   Building Maintenance & Management Center  

    2018.10 - 2019.8   

      More details

  •   Architectural Institute of Japan  

    2018.6 - 2025.3   

      More details

  •   Architectural Institute of Japan Managing Committee of Steel Structures  

    2018.4   

      More details

  •   Japan Building Disaster Prevention Association  

    2017.4 - 2022.3   

      More details

  •   Architectural Institute of Japan  

    2017.4 - 2021.3   

      More details

  •   Japan Building Disaster Prevention Association  

    2017.4 - 2018.3   

      More details

  •   Architectural Institute of Japan  

    2016.4 - 2018.3   

      More details

  •   Public Buildings Association  

    2015.10 - 2016.8   

      More details

  •   Building Maintenance & Management Center  

    2015.10 - 2016.8   

      More details

  •   The Building Center of Japan  

    2013.10 - 2018.3   

      More details

  •   Japan Building Disaster Prevention Association  

    2013.10 - 2014.3   

      More details

  •   National Research Institute for Earth Science and Disaster Resilience  

    2013.6 - 2017.3   

      More details

  •   Architectural Institute of Japan  

    2013.4 - 2018.3   

      More details

  •   Architectural Institute of Japan  

    2013.4 - 2017.3   

      More details

  •   Architectural Institute of Japan  

    2013.4   

      More details

  •   Japan Building Disaster Prevention Association  

    2012.10 - 2019.3   

      More details

  •   Public Buildings Association  

    2012.10 - 2013.8   

      More details

  •   Building Maintenance & Management Center  

    2012.10 - 2013.8   

      More details

  •   Japanese Society of Steel Construction  

    2012.7 - 2014.3   

      More details

  •   Architectural Institute of Japan  

    2011.4 - 2017.3   

      More details

  •   Japan Building Disaster Prevention Association  

    2011 - 2016   

      More details

  •   Japan Association for Earthquake Engineering  

    2011 - 2012   

      More details

  •   Japan Association for Earthquake Engineering  

    2010 - 2014   

      More details

  •   Architectural Institute of Japan  

    2009.4 - 2013.3   

      More details

  •   Architectural Institute of Japan Managing Committee on Loads and Actions on Buildings  

    2005.4 - 2013.3   

      More details

▼display all

Papers

  • RESPONSE REDUCTION EFFECT DUE TO UPLIFT IN FREE VIBRATION OF VERTICAL HYBRID BUILDINGS Reviewed

    Tadashi Ishihara, Yutaka Morishita

    Journal of Structural and Construction Engineering (Transactions of AIJ)   91 ( 843 )   633 - 642   2026.5

     More details

    Authorship:Lead author   Language:Japanese   Publishing type:Research paper (scientific journal)  

    The modal properties and the free vibration behavior accompanied with uplift motion are examined in vertical hybrid buildings with wooden upper part and RC lower part. Eigenvalue analysis is conducted to derive the uplifting modes. Using these modes, free vibration during an uplift excursion is simulated by modal analysis. In the hybrid buildings, it was clarified that the effective mass ratio for third- and fourth- modes and the base shear coefficients at the static equilibrium position become larger than those of a uniform structure, making it difficult to achieve the response reduction effect due to uplift.

    DOI: 10.3130/aijs.91.633

    researchmap

  • Shaking Table Test of Seismic-Resistant Ceiling Systems with Asymmetric Mass or Stiffness Distribution Reviewed

    Haruki Yamaguchi, Tadashi Ishihara, Yusuke Oki

    Proceedings of Sixth International Workshop on Seismic Performance of Non-Structural Elements (SPONSE)   2026.3

     More details

    Language:English   Publishing type:Research paper (international conference proceedings)  

    researchmap

  • PIECEWISE-LINEAR MODAL-ANALYSIS METHOD FOR SEISMIC UPLIFTING RESPONSE OF MULTISTORY BUILDINGS MODELED AS UNIFORM SHEAR-BEAM Reviewed

    Tadashi ISHIHARA, Hisatoshi KASHIWA, Tatsuya AZUHATA, Mitsumasa MIDORIKAWA

    Journal of Structural Engineering   Vol. 71B   113 - 119   2025.4

     More details

    Authorship:Lead author   Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Architectural Institute of Japan  

    DOI: 10.3130/aijjse.71B.0_113

    researchmap

  • SEISMIC RESPONSE OF LARGE SECONDARY SYSTEMS INSTALLED IN CONTINUOUS BROAD AREAS IN SINGLE-STORY ASYMMETRIC BUILDINGS Reviewed

    Kohei MIYAMURA, Tadashi ISHIHARA

    Journal of Structural Engineering   Vol. 71B   185 - 192   2025.4

     More details

    Authorship:Last author   Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Architectural Institute of Japan  

    DOI: 10.3130/aijjse.71B.0_185

    researchmap

  • Floor Response Spectra of Single-story Asymmetric Buildings Reviewed

    Tadashi ISHIHARA

    Journal of Japan Association for Earthquake Engineering   Volume 24 ( Issue 4 )   76 - 84   2024.9

     More details

    Authorship:Lead author   Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Japan Association for Earthquake Engineering  

    In the seismic design of secondary systems (SS) such as nonstructural components, the effect of torsional vibration of structural frames is not explicitly considered. Although torsional vibration may increase the inertia forces of SS, the degree of amplification and governing parameters have not been sufficiently clarified yet. In this paper, floor response spectra are investigated for single-story asymmetric buildings to understand the effect of torsion on SS. The results show that the maximum value of floor response spectrum becomes larger than that without the effect of torsion as the eccentricity ratio increases. But when the eccentricity ratio exceeds 0.1, the maximum value is almost constant at about 1.2 times larger than that without eccentricity.

    DOI: 10.5610/jaee.24.4_76

    researchmap

  • SEISMIC TORSIONAL RESPONSE OF ASYMMETRIC SECONDARY SYSTEMS Reviewed International journal

    Tadashi Ishihara

    Proceedings of the 18th world conference on earthquake engineering   2024.6

     More details

    Authorship:Lead author   Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:International Association for Earthquake Engineering  

    researchmap

  • EFFECT OF STIFFNESS ECCENTRICITY OF SWAY SPRINGS ON SEISMIC TORSIONAL RESPONSE OF BUILDINGS Reviewed

    Tadashi ISHIHARA, Hisatoshi KASHIWA, Hitomitsu KIKITSU, Namihiko INOUE

    AIJ Journal of Technology and Design   Vol. 30 ( No. 74 )   53 - 58   2024.2

     More details

    Authorship:Lead author   Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Architectural Institute of Japan  

    DOI: 10.3130/aijt.30.53

    researchmap

  • CORRELATION COEFFICIENTS BETWEEN STORY DRIFTS OF PRIMARY FRAMES AND DISPLACEMENTS OF SECONDARY SYSTEMS IN LINEAR SEISMIC RESPONSES Reviewed

    Tadashi Ishihara, Atsuko Sauda, Masayuki Nagano

    Journal of Structural and Construction Engineering (Transactions of AIJ)   88 ( 808 )   932 - 937   2023.6

     More details

    Authorship:Lead author   Language:Japanese   Publishing type:Research paper (scientific journal)  

    In the seismic design of nonstructural components, inertial forces and relative displacements are usually considered separately. But the two factors should be appropriately combined in some cases of connecting conditions to the structural frames. In this paper, the correlation coefficients between the story drifts of structural frames and the displacements of secondary systems are investigated in linear seismic responses. An approximate evaluation formula for multistory buildings is presented and validated through response history analysis. It is shown that the correlations are relatively high in the range of periods shorter than the first natural periods of structural frames.

    DOI: 10.3130/aijs.88.932

    researchmap

  • MODAL ANALYSIS OF SEISMIC FORCES FOR LIGHT-WEIGHT BENDING BEAM FIXED AT ONE END AND PIN-SUPPORTED AT THE OTHER IN A MULTISTORY BUILDING Reviewed

    Tadashi ISHIHARA, Yusuke Oki, Shoichi Kishiki

    Journal of Structural Engineering   Vol. 68B   435 - 441   2022.4

     More details

    Authorship:Lead author   Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Architectural Institute of Japan  

    In our previous studies, seismic forces for secondary systems (SS) such as nonstructural components are investigated using light-weight bending-beam models with boundary condition (BC) of both pin-supported ends or of both fixed ends. In this paper, seismic forces for SS modeled as beams with another BC of one fixed end and the other pin-supported end are examined. Structural frames and SS are assumed to be linear. A modal analysis method for them is derived. The results with different BCs are compared and clarify the effect of BCs on seismic forces for SS.

    DOI: 10.3130/aijjse.68B.0_435

    researchmap

  • SEISMIC INERTIAL AND RELATIVE DISPLACEMENT DEMANDS FOR LIGHT-WEIGHT BENDING BEAM FIXED TO THE UPPER AND LOWER FLOORS IN A MULTISTORY BUILDING Reviewed

    Tadashi ISHIHARA, Shojiro MOTOYUI, Shoichi KISHIKI, Yusuke OKI

    Journal of Structural and Construction Engineering (Transactions of AIJ)   Vol. 86 ( No. 779 )   43 - 51   2021.1

     More details

    Authorship:Lead author   Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Architectural Institute of Japan  

    1. Introduction
    In the seismic design of secondary systems (SS) such as nonstructural components, inertial and relative displacement effects are usually considered independently. But the reason for this independence is not clarified enough. In past researches, response spectrum methods have been proposed to analyze three-dimensional piping. Those methods are too complicated to apply for the seismic design of SS in general buildings. It seems useful to obtain basic knowledge for the practical design of SS by studying both effects with a simple typical model.
    In this paper, seismic responses due to both effects are studied for SS modeled as light-weight bending beams fixed to the upper and lower floors in a multistory building through response history analysis.
    2. Mathematical model and analysis method
    Lumped-mass shear-type models and uniform bending-beam models are used for structural frames and SS respectively. The boundary conditions of SS are pin-ends and fixed-ends. The former condition is for comparison and has no effect of relative displacement. Structural frames and SS are assumed to be linear.</p><p> A modal analysis method is derived. For inertial effect, responses of modes of structural frames are used as inputs to those of SS.
    3. Response histories and peak sectional forces
    A three-story model is used as a structural frame. The first natural period is set to be 0.6 sec. except for some cases, while those for SS with pin-ends and fixed-ends are set to be 0.4 and 0.176 sec. respectively for almost cases. Ground motion to the structural frame is an artificial one with a response spectrum corresponding to the lower seismic design level in Japan.
    Response histories are shown to confirm the characteristics of responses of SS and phases of effects of inertia and relative displacements. Peak sectional forces along the height of SS are shown. Variations in those peak values due to the change of the natural period of structural frame and SS are shown in spectral form.
    4. Conclusion
    The results of this paper are summarized as follows.
    (1) A modal analysis method has been derived.
    (2) Characteristics of the responses of SS such as pseudo-static responses have been confirmed.
    (3) The primary mode of SS is dominant in responses by inertial effects.
    (4) Even if the natural frequency of SS is increased by changing the boundary condition from pin-ends to fixed-ends, it may be impossible to decrease seismic responses due to the effect of relative displacements.
    (5) Because forces due to the effects of inertia and relative displacement are often in-phase, both effects should be appropriately combined in design.
    (6) Seismic responses of SS increase with increase or decrease its natural frequency.
    (7) While seismic responses of SS with pin-ends decreases as the natural frequency of the structural frame decreases, those with fixed-ends increase.

    DOI: 10.3130/aijs.86.43

    researchmap

  • EFFECTIVE MASS TENSOR TO IDENTIFY THE INERTIAL MASS AND PRINCIPAL AXIS OF A MULTIDIMENSIONAL MODE International journal

    Tadashi Ishihara

    Proceedings of 17th World Conference on Earthquake Engineering   ( 2k-0039 )   2020.9

     More details

    Authorship:Lead author   Language:English   Publishing type:Research paper (international conference proceedings)  

    researchmap

  • On Seismic Torsional Response of Secondary Systems Reviewed

    Tadashi ISHIHARA

    Journal of Japan Association for Earthquake Engineering   Vol. 19 ( No. 5 )   224 - 234   2019.9

     More details

    Authorship:Lead author   Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Japan Association for Earthquake Engineering  

    In regards to seismic response of secondary systems, maximum floor acceleration and floor response spectrum have been studied by many researchers. But characteristics of seismic torsional responses of secondary systems have not been clarified yet. In this paper, seismic torsional responses of secondary systems are investigated through response history analysis. A structural frame for secondary systems is assumed to be linear without irregularity. Secondary systems are also assumed to be linear but with plan irregularity. Characteristics of seismic torsional responses of secondary systems are clarified comparing with those of primary systems.

    DOI: 10.5610/jaee.19.5_224

    researchmap

  • On acceleration of main frames for estimation of inertia force in seismic design of non-structural components Reviewed

    Tadashi Ishihara, Yuichi Yamanaka, Satoshi YAMADA, Shojiro Mptoyui, Tsuyoshi Seike, Yoshio Wakiyama

    Journal of Structural Engineering   Vol. 63B ( No. )   75 - 82   2017.3

     More details

    Authorship:Lead author   Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Architectural Institute of Japan  

    CiNii Books

    CiNii Research

    researchmap

  • Seismic design force on nonstructural components based on a direct method for floor response spectrum Reviewed

    Tadashi Ishihara, Shojiro Motoyui, Yoshio Wakiyama

    AIJ Journal of Technology and Design   Vol. 21 ( No. 48 )   511 - 515   2015.6

     More details

    Authorship:Lead author   Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Architectural Institute of Japan  

    DOI: 10.3130/aijt.21.511

    Scopus

    researchmap

  • EFFECTIVE MASS TENSOR Inertial mass and principal axis of multidimensional mode Reviewed

    Tadashi Ishihara

    Journal of Structural and Construction Engineering (Transactions of AIJ)   Vol. 78 ( No. 691 )   1553 - 1558   2013.9

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Architectural Institute of Japan  

    DOI: 10.3130/aijs.78.1553

    Scopus

    researchmap

  • RELATION BETWEEN UNIFORM ELONGATION AND RUPTURE ELONGATION AT COUPON TENSION TESTS OF STRUCTURAL STEEL Reviewed

    Yoshihiro IWATA, Tadashi ISHIHARA, Akiyoshi MUKAI, Isao NISHIYAMA, Hirofumi AOKI

    Journal of Structural and Construction Engineering (Transactions of AIJ)   Vol. 78 ( No. 683 )   223 - 232   2013.1

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Architectural Institute of Japan  

    DOI: 10.3130/aijs.78.223

    Scopus

    researchmap

  • EFFECT OF ROTATIONAL INERTIA ON UPLIFTING BEHAVIOR OF MULTISTORY BUILDINGS MODELED AS UNIFORM SHEAR-BEAM Reviewed

    Tadashi ISHIHARA, Tatsuya AZUHATA, Mitsumasa MIDORIKAWA

    Journal of Structural and Construction Engineering (Transactions of AIJ)   Vol. 76 ( No. 667 )   1601 - 1610   2011.9

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Architectural Institute of Japan  

    DOI: 10.3130/aijs.76.1601

    Scopus

    researchmap

  • MODAL PROPERTIES AND FREE VIBRATION OF UPLIFTING BEHAVIOR OF MULTISTORY BUILDINGS MODELED AS UNIFORM SHEAR-BEAM Reviewed

    Tadashi ISHIHARA, Mitsumasa MIDORIKAWA, Tatsuya AZUHATA

    Journal of Structural and Construction Engineering (Transactions of AIJ)   Vol. 74 ( No. 640 )   1055 - 1061   2009.6

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:日本建築学会  

    DOI: 10.3130/aijs.74.1055

    Scopus

    researchmap

  • Shaking table tests on seismic response of steel braced frames with column uplift Reviewed International journal

    Mitsumasa Midorikawa, Tatsuya Azuhata, Tadashi Ishihara, Akira Wada

    Earthquake Engineering & Structural Dynamics   Vol. 35 ( No. 14 )   1767 - 1785   2006.11

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1002/eqe.603

    Web of Science

    researchmap

  • Damage Behavior of Light Gauge Steel Partition Wall under In-plane and Out-of-plane External Forces Reviewed

    Yusuke Oki, Shoichi Kishiki, Tadashi Ishihara

    Proceedings of Sixth International Workshop on Seismic Performance of Non-Structural Elements (SPONSE)   2026.3

     More details

    Language:English   Publishing type:Research paper (international conference proceedings)  

    researchmap

  • Identification of Natural Frequency and Damping Ratio of Partition Wall from Earthquake Observation Records Reviewed

    Sora Hagiwara, Daiki Sato, Sono Yanagiya, Yinli Chen, Alex Shegay, Shoichi Kishiki, Tadashi Ishihara, Shojiro Motoyui, Yuzi Huang

    Proceedings of Sixth International Workshop on Seismic Performance of Non-Structural Elements (SPONSE)   2026.3

     More details

    Language:English   Publishing type:Research paper (international conference proceedings)  

    researchmap

  • Experiments on the reinforcement of insert plate in axial members with single-shear-type joints Reviewed

    YAMAGUCHI Yuto, MIKI Norihito, ISHIHARA Tadashi, KIKITSU Hitomitsu

    Vol. 33   628 - 634   2025.11

     More details

    Language:Japanese   Publishing type:Research paper (conference, symposium, etc.)  

    researchmap

  • SEISMIC PERFORMANCE OF PARTITION WALLS SUBJECTED TO STORY DRIFT AND INERTIAL FORCE Reviewed International journal

    Yusuke Oki, Shoichi Kishiki, Nobuhiko Tatsumi, Tadashi Ishihara

    Proceedings of the 18th world conference on earthquake engineering   2024.6

     More details

    Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:International Association for Earthquake Engineering  

    researchmap

  • Seismic Response of a Secondary System Occupying a Large Area in a Single-Story Asymmetric Building

    MIYAMURA Kohei, ISHIHARA Tadashi

    Ⅰ   493 - 496   2024.3

     More details

    Language:Japanese   Publishing type:Research paper (conference, symposium, etc.)  

    researchmap

  • Floor Response Spectrum of a Single-story Building Causing Torsional Vibration

    Tadashi Ishihara

    Proceedings of the 16th Japan Earthquake Engineering Symposium   Day1-G416-09   2023.11

     More details

    Authorship:Lead author   Language:Japanese   Publishing type:Research paper (conference, symposium, etc.)  

    researchmap

  • STRUCTURAL BEHAVIOR OF BEAM JOINT USING BEARING BOLTS Reviewed

    Ryohei OBA, Tatsuya NAKANO, Takashi HASEGAWA, Tadashi ISHIHARA, Susumu KUWAHARA

    Journal of Structural and Construction Engineering (Transactions of AIJ)   Vol. 87 ( No. 801 )   1071 - 1081   2022.11

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Architectural Institute of Japan  

    DOI: 10.3130/aijs.87.1071

    researchmap

  • Mechanical behavior of beam joint using normal bolts Part4 Evaluation of the rotation angle according to the slip and the bearing rotational stiffness

    Ryohei Oba, Tatsuya Nakano, Takashi Hasegawa, Tadashi Ishihara, Susumu Kuwahara

    Summaries of Technical Papers of Annual Meeting, AIJ   構造Ⅲ   861 - 862   2022.7

     More details

    Language:Japanese   Publishing type:Research paper (conference, symposium, etc.)   Publisher:Architectural Institute of Japan  

    researchmap

  • CYCLIC LOADING TEST OF CLT-STEEL HYBRID STRUCTURE FRAME WITH CONNECTIONS TO IMPROVE HYSTERETIC BEHAVIOR Reviewed

    Norihito MIKI, Shoichi NAKASHIMA, Yoshihiro YAMAZAKI, Tadashi ISHIHARA

    AIJ Journal of Technology and Design   Vol. 27 ( No. 65 )   213 - 218   2021.2

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Architectural Institute of Japan  

    DOI: 10.3130/aijt.27.213

    researchmap

  • SEISMIC DAMAGE REDUCTION DUE TO UPLIFT: SHAKING TABLE TEST OF A SINGLE-STORY FRAME MODEL ON RIGID GROUND International journal

    Mitsumasa Midorikawa, Tadashi Ishihara, Hisatoshi Kashiwa, Tatsuya Azuhata

    Proceedings of 17th World Conference on Earthquake Engineering   Vol. ( No. )   2020.9

     More details

    Language:English   Publishing type:Research paper (international conference proceedings)  

    researchmap

  • DAMAGE REDUCTION OF LIGHT-GAUGE STEEL STUD PARTITION WALL (PART 1): OUT-OF-PLANE STRENGTH OF STUD-TO-TRACK CONNECTIONS Reviewed

    Shoichi KISHIKI, Syougo SAKURADA, Nobuhiko TATSUMI, Tadashi ISHIHARA, Shojiro MOTOYUI

    Journal of Structural and Construction Engineering (Transactions of AIJ)   Vol. 85 ( No. 773 )   969 - 979   2020.7

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Architectural Institute of Japan  

    <p> Although the structural system was slightly damaged, damage to the nonstructural components could lead to the complete or partial closure of buildings. Lessons learned from recent earthquakes indicate that protecting the nonstructural components is very important for structural engineers to realize functional continuity of buildings after earthquakes. Especially from the damage of the 2011 Tohoku earthquake, a number of research has been conducted to investigate the structural behavior and damage mechanisms of ceilings as non-structural components. And based on the research, seismic design procedures were established to avoid the fall of ceilings in order to save human life and to keep functional continuity. On the other hand, a reconnaissance of recent earthquakes reported that light-gauge steel (LGS) stud partition walls were also damaged, and its damage led to the complete or partial closure of buildings. Following the previous research project for ceilings, a number of research on LGS partition wall has to be conducted to reduce the seismic damage to the walls.</p><p> In this research, a systematic experimental program for investigating the structural behavior and damage mechanism of LGS partition walls will be conducted to establish the seismic design procedure. As the first step, element tests of stud-to-track connections were conducted to evaluate the ultimate strength. The main test parameters are the length of track, the clearance between track and stud, the pitch of bolts which connect the track to the reaction jig, and the number and spacing of studs. Here, a clearance of 10mm is employed at the top side of stud for workability on construction site. Power actuated fasteners are widely used for tracks to concrete slab connections, and a distance around 900mm is recommended for a pitch of the fasteners in standard specification of construction work.</p><p> The test results can be summarized as follows:(1) the structural behavior of stud-to-track connection is dominated by the out-of-plane bending of one-side flange plate of track. Therefore, effects of cyclic loadings on ultimate strength are few; (2) the strength is affected by the length of track and inversely proportional to the clearance between track and stud: (3) the total strength of multiple studs is not in proportional to the number of studs because the multiple studs share the effective width for strength evaluation; (4) a strength evaluation model has been established from the test results.</p>

    DOI: 10.3130/aijs.85.969

    CiNii Books

    CiNii Research

    researchmap

  • STUDY ON ESTIMATION METHOD FOR RAIN-ON-SNOW LOAD ON THE ROOF CONSIDERING CAPILLARY ACTION Reviewed

    Daisuke SAKURAI, Shiryu KOJIMA, Masaya OTSUKI, Hitomitsu KIKITSU, Tadashi ISHIHARA, Toru TAKAHASHI

    Journal of Structural and Construction Engineering (Transactions of AIJ)   Vol. 85 ( No. 776 )   1255 - 1262   2020.5

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Architectural Institute of Japan  

    DOI: 10.3130/aijs.85.1255

    Scopus

    researchmap

  • MODAL ANALYSIS OF SEISMIC FORCES FOR NONSTRUCTURAL COMPONENTS MODELED AS PIN-SUPPORTED BENDING BEAMS Reviewed

    Tadashi ISHIHARA, Yusuke Oki, Shoichi Kishiki, SHOJIRO MOTOYUI, Yoshihiro IWATA

    Journal of Structural Engineering   Vol. 66B ( No. )   339 - 344   2020.3

     More details

    Authorship:Lead author   Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Architectural Institute of Japan  

    researchmap

  • A Study on Story Drift under Severe Earthquakes Based on Response and Limit Capacity Calculation Reviewed

    Tadashi ISHIHARA

    Proceedings of Constructional Steel   27   2019.11

     More details

    Authorship:Lead author   Language:Japanese   Publishing type:Research paper (conference, symposium, etc.)  

    researchmap

  • Experiment on Response Characteristics of A Single-Story Structure with Mass Asymmetry in the Vibration Direction Accompanied by Uplift and Its Seismic Response Prediction Reviewed

    Hirofumi KAMBE, Tadashi ISHIHARA, Masayuki NAGANO

    Journal of Japan Association for Earthquake Engineering   19 ( 5 )   235 - 246   2019.9

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)  

    DOI: 10.5610/jaee.19.5_235

    researchmap

  • EVALUATION OF MODAL CORRELATION COEFFICIENT IN SECONDARY SYSTEMS Reviewed

    Kazuhisa TAKAHASHI, Tadashi ISHIHARA, Kento SUZUKI, Masayuki NAGANO

    Journal of Structural and Construction Engineering (Transactions of AIJ)   Vol. 84 ( No. 756 )   161 - 170   2019.2

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Architectural Institute of Japan  

    It is important to evaluate the modal correlation coefficient when the responses to be combined are from modes with closely spaced frequencies. In these cases, the complete quadratic combination (CQC) rule is used instead of the square root of the sum of the squares(SRSS). To evaluate the value of the modal correlation coefficient, it was evaluated as a CQC factor. However, an exception to this approach arises when the modal correlation coefficient in secondary systems is evaluated. When the modal correlation coefficient in secondary systems was evaluated, it was found that the tendency of the modal correlation coefficient in the primary and secondary systems analyzed by time history response was different, with the latter being greater than the former for the modal correlation coefficient when the natural period in the primary system is longer than that in secondary system. Other studies have proposed formulas for the modal correlation coefficient in a primary system. This study aims to propose a formula for the modal correlation coefficient in secondary systems based on primary system formulas reported in these previous studies. Furthermore, the modal correlation coefficient in the secondary system was examined based on our proposed formula.<br> The conclusions of this study are summarized as follows:<br> 1) Comparing of the modal correlation coefficient in secondary systems in single degree of freedom with that in multi-degrees-of-freedom, the tendencies were found to be different. Moreover, they were particularly different from the secondary and tertiary natural periods in multi-degrees-of-freedom.<br> 2) The modal correlation coefficient in multi-degrees-of-freedom is expressed as the sum of the products of a participation vector of primary systems, the Fourier amplitude of ground motion and a factor of the modal correlation coefficient in single-degree-of-freedom primary systems. Additionally, the modal correlation coefficient in the secondary systems calculated by Eq. 10 can be evaluated by adding components around three-order modes.<br> 3) It is confirmed that CQC factors to combine peak values nearly correspond to correlation coefficient not only in primary systems but also in secondary systems.

    DOI: 10.3130/aijs.84.161

    researchmap

  • Seismic performance in the out-of-plane direction of partition wall with 65-type light-gauge steel Reviewed

    Yusuke Oki, Tadashi Ishihara, Shun Okabe, Kento Suzuki, Masayuki Nagano, Yoshihiro Iwata

    AIJ Journal of Technology and Design   Vol. 24 ( No. 58 )   935 - 939   2018.10

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Architectural Institute of Japan  

    DOI: 10.3130/aijt.24.935

    researchmap

  • Relationship between uniform elongation and rupture elongation of coupon tension specimens with full thickness more than width Reviewed

    Tadashi Ishihara, Yoshihiro Iwata, Takashi Hasegawa, Norihito Miki

    AIJ Journal of Technology and Design   Vol. 24 ( No. 58 )   1059 - 1062   2018.10

     More details

    Authorship:Lead author   Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Architectural Institute of Japan  

    Coupon tension tests using steel plate specimens with full thickness more than width were conducted to obtain the relation between uniform elongation and rupture elongation. Two types of steel materials (SA440, H-SA700) were selected and three types of coupon tension specimen (JIS No.1A, No.5, and No.12A) were used for the tests. After showing characteristic results of thick specimens, the applicability of a prediction formula for the relation proposed by the authors is investigated. It is clarified that the rupture elongation values obtained from the proposed formula are almost equal to or larger than those of the corresponding test results.

    DOI: 10.3130/aijt.24.1059

    CiNii Books

    CiNii Research

    researchmap

    Other Link: http://id.ndl.go.jp/bib/029299432

  • MECHANICAL PROPERTIES AND REQUIRED SEISMIC DEFORMATIONS OF STEP PARTS IN STEEL-FURRING SUSPENDED-CEILING SYSTEMS IN JAPAN International journal

    Keigo Yamashita, Tadashi Ishihara, Hirofumi Kambe, Kento Suzuki, Masayuki Nagano

    Proceedings of 16th European Conference on Earthquake Engineering   Vol. ( No. )   2018.6

     More details

    Language:English   Publishing type:Research paper (international conference proceedings)  

    researchmap

  • COMPARISON BETWEEN THE SEISMIC RESPONSE AND FREE VIBRATION OF A UNIFORM SHEAR-BEAM MODEL ALLOWED TO UPLIFT BASED ON A PIECEWISE-LINEAR MODAL ANALYSIS METHOD International journal

    Tadashi Ishihara, Tatsuya Azuhata, Hisatoshi Kashiwa, Mitsumasa Midorikawa

    Proceedings of 16th European Conference on Earthquake Engineering   Vol. ( No. )   2018.6

     More details

    Language:English   Publishing type:Research paper (international conference proceedings)  

    researchmap

  • SEISMIC DESIGN FORCE FOR CEILINGS IN JAPAN BASED ON A DIRECT METHOD FOR FLOOR RESPONSE SPECTRUM International journal

    Tadashi Ishihara, Shojiro Motoyui, Yoshio Wakiyama

    Proceedings of 16th European Conference on Earthquake Engineering   Vol. ( No. )   2018.6

     More details

    Authorship:Lead author   Language:English   Publishing type:Research paper (international conference proceedings)  

    researchmap

  • EVALUATION OF SEISMIC IN-PLANE SHEAR DEFORMATION OF GRID-TYPE SYSTEM CEILINGS IN JAPAN International journal

    Hirofumi Kambe, Tadashi Ishihara, Keigo Yamashita, Kento Suzuki, Masayuki Nagano

    Proceedings of 16th European Conference on Earthquake Engineering   Vol. ( No. )   2018.6

     More details

    Language:English   Publishing type:Research paper (international conference proceedings)  

    researchmap

  • NUMERICAL STUDY ON A PROPOSED FORMULA FOR FLOOR ACCELERATION OF MAIN FRAMES IN SEISMIC DESIGN OF NON-STRUCTURAL COMPONENTS Reviewed

    YAMANAKA Yuichi, ISHIHARA Tadashi, YAMADA Satoshi, MOTOYUI Shojiro, SEIKE Tsuyoshi, Yotai Wakiyama

    AIJ Journal of Technology and Design   Vol. 24 ( No. 57 )   547 - 552   2018.6

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Architectural Institute of Japan  

    &lt;p&gt;In general, it is difficult to calculate floor accelerations of main frames in non-linear seismic responses for seismic design of non-structural components. A formula to calculate them without time history analysis and eigenvalue analysis has been proposed by authors. Based on the formula, this paper verifies applicability of the formula to real building models and proposes a practical way of setting strength factor in the formula. By comparing the results by time history analysis, it is confirmed that the formula gives good estimation for floor accelerations.&lt;/p&gt;

    DOI: 10.3130/aijt.24.547

    CiNii Books

    CiNii Research

    researchmap

  • A DIRECT ESTIMATION METHOD FOR RC BUILDINGS FOR NON-LINEAR FLOOR RESPONSE SPECTRUM Reviewed

    SATO Kohei, ISHIHARA Tadashi, SUZUKI Kento, NAGANO Masayuki

    AIJ Journal of Technology and Design   Vol. 24 ( No. 57 )   679 - 683   2018.6

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Architectural Institute of Japan  

    &lt;p&gt;In this report, a direct estimation method is proposed for non-linear floor response spectrum in RC buildings with a degrading hysteretic loop based on the Takeda model. The method uses the concept of linear modal analysis with empirical coefficients and formulas characterized for the RC buildings. A shift of the resonance region, which is negligible for S buildings with bi-linear hysteresis, is also empirically evaluated for the first mode. Amplification factors of floor responses for the multi story RC buildings are verified by compared with those by nonlinear time history response analyses using number of earthquake input motions.&lt;/p&gt;

    DOI: 10.3130/aijt.24.679

    researchmap

  • Proposal of a selection method of structural submembers for partition walls made of stacked alc-panels based on out-of-plane natural frequency Reviewed

    Tadashi Ishihara, Takushi Ishida, Ken'ichi Matsushita, Hisashi Taguchi, Morimasa Watakabe

    AIJ Journal of Technology and Design   Vol. 23 ( No. 55 )   801 - 804   2017.10

     More details

    Authorship:Lead author   Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Architectural Institute of Japan  

    DOI: 10.3130/aijt.23.801

    Scopus

    researchmap

  • STATIC LOADING TESTS OF STEP PART IN STEEL FURRING SUSPENDED CEILING SYSTEM AND ESTIMATION OF REQUIRED DEFORMATION CAPACITY DURING EARTHQUAKES Reviewed

    YAMASHITA Keigo, ISHIHARA Tadashi, KAMBE Hirofumi, SUZUKI Kento, NAGANO Masayuki

    AIJ Journal of Technology and Design   Vol. 23 ( No. 55 )   827 - 831   2017.10

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Architectural Institute of Japan  

    According to the new standard for specified ceiling, it is recommended to separate adjacent ceiling zones at step parts. In specified ceilings, conventional continuous step parts may not be damaged because of small deformations by bracings, but the requirements are not clear. In this report, static loading tests are conducted to clarify mechanical properties of step parts of steel furring suspended ceiling systems. The required displacements are calculated by numerical analysis and compared with the experimental results. Integration of the step part can be allowable by properly selecting combination of the natural period of buildings and adjacent ceiling zones.

    DOI: 10.3130/aijt.23.827

    researchmap

  • STATIC LOADING TESTS ON IN-PLANE SHEAR BEHAVIOR OF GRID-TYPE SYSTEM CEILINGS AND EVALUATION OF THEIR SEISMIC RESPONSES Reviewed

    KAMBE Hirofumi, ISHIHARA Tadashi, YAMASHITA Keigo, SUZUKI Kento, NAGANO Masayuki

    AIJ Journal of Technology and Design   Vol. 23 ( No. 55 )   839 - 843   2017.10

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Architectural Institute of Japan  

    Grid-type system ceilings are widely used in Japan, but those seismic performances have not been clarified sufficiently yet. In this report, static loading tests are conducted to clarify in-plane shear behaviors and collapse states of system ceilings. Based on the test results, an analytical model with corresponding restoring force characteristics is established. Seismic response analyses under moderate earthquakes show that in-plane deformations are less than about 20% of the one corresponding to maximum bearing capacity in the test. It is noteworthy that brace layout and number of earthquakes can be factors to increase shear deformations.

    DOI: 10.3130/aijt.23.839

    CiNii Books

    researchmap

  • STUDY ON ESTIMATION METHOD FOR SURCHARGE SNOW LOAD DUE TO RAINFALL Reviewed

    Masaya OTSUKI, Toru TAKAHASHI, Tsukasa TOMABECHI, Takahiro CHIBA, Takuya TSUTSUMI, Isao KAMIISHI, Hitomitsu KIKITSU, Yoshihiro IWATA, Tadashi ISHIHARA, Yasuo OKUDA

    Journal of Structural and Construction Engineering (Transactions of AIJ)   Vol. 82 ( No. 739 )   1329 - 1338   2017.9

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Architectural Institute of Japan  

    DOI: 10.3130/aijs.82.1329

    Scopus

    researchmap

  • A SIMPIFIED PREDICTION METHOD FOR SEISMIC RESPONSES OF BUILDING FRAME STRUCTURES ALLOWED TO UPLIFT International journal

    Tatsuya Azuhata, Tadashi Ishihara

    Proceedings of COMPDYN 2017   Vol. ( No. )   2950 - 2962   2017.6

     More details

    Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:National Technical University of Athens  

    DOI: 10.7712/120117.5619.17955

    Scopus

    researchmap

  • Proposal of a direct estimation method for floor response spectrum in non-linear seismic behavior Reviewed

    Tadashi Ishihara, Kohei Sato, Kento Suzuki, Masayuki Nagano

    AIJ Journal of Technology and Design   Vol. 23 ( No. 54 )   433 - 436   2017.6

     More details

    Authorship:Lead author   Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Architectural Institute of Japan  

    DOI: 10.3130/aijt.23.433

    Scopus

    researchmap

  • Seismic Energy Response of Multi-story Steel Rocking Frames Allowing Column Mid-height Uplift at the First Story International journal

    M. Midorikawa, N. Kotani, T. Okazaki, T. Asari, Tadashi Ishihara, T. Azuhata

    Proceedings of 16th World Conference on Earthquake Engineering   Vol. ( No. )   2017.1

     More details

    Language:English   Publishing type:Research paper (international conference proceedings)  

    researchmap

  • STATIC LOADING TESTS FOR IN-PLANE COMPRESSION STRENGTH OF STEEL FURRING SUSPENDED CEILING SYSTEM WITH DIFFERENT OVERHANGING LENGTH Reviewed

    ISHIHARA Tadashi, INAI Shinsuke, MORITA Yasuhiro, WATAKABE Morimasa, Yoshio Wakiyama

    AIJ Journal of Technology and Design   Vol. 22 ( No. 52 )   993 - 996   2016.10

     More details

    Authorship:Lead author   Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Architectural Institute of Japan  

    Recent researches pointed out that steel furring suspended ceiling systems attached to its surrounding walls/beams without clearance have a certain seismic capacity. Although guidelines limit overhanging length at the end of ceilings, the effect of the length on in-plane compression strength of ceilings has not been clarified yet. In this paper, static loading tests are conducted to grasp the effect and collapse mechanisms using some specimens with different overhanging length. The results show that the effect is relatively small.

    DOI: 10.3130/aijt.22.993

    CiNii Books

    researchmap

  • Evaluation of Roof Snow Load considering Rain–on–Snow Surcharge- Part 7 Indoor experimental study on unusual shaped roofs –

    Otsuki M., Takahashi T., Adachi S., Saito Y., Nakamura K., Kikitsu H., Okuda Y., Ishihara T., Chiba T.

    Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research   2016   75   2016

     More details

    Language:Japanese   Publisher:The Japanese Society of Snow and Ice / Japan Society for Snow Engineering  

    DOI: 10.14851/jcsir.2016.0_75

    CiNii Research

    researchmap

  • MECHANICAL PROPERTIES OF STEEL FURRING SUSPENDED CEILING SYSTEM UNDER STATIC IN-PLANE COMPRESSION Reviewed

    INAI Shinsuke, ISHIHARA Tadashi, WATAKABE Morimasa, MORITA Yasuhiro, Yotai Wakiyama, KIKITSU Hitomitsu

    AIJ Journal of Technology and Design   Vol. 21 ( No. 48 )   455 - 460   2015.6

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Architectural Institute of Japan  

    In recent years, suspended ceilings were often damaged by earthquakes. Investigations on seismic capacity of ceilings have been conducted by some researchers. The new standard for ceilings against earthquakes requires a relatively large clearance around those to prevent collision with surrounding walls. On the other hand, there are still the needs for ceilings without clearance because of workability or room&amp;rsquo;s uses. In this paper, mechanical properties of steel furring suspended ceiling system for in-plane compression are clarified by static compression tests, using small and large scale specimen. Those properties are essential to evaluate the seismic capacity of ceilings without clearance.

    DOI: 10.3130/aijt.21.455

    CiNii Books

    researchmap

  • Static Loading Tests of Column Mid-height Uplift Mechanism with Steel Damper International journal

    M. Midorikawa, Y. Kato, Y. Kawai, Tadashi Ishihara, T. Okazaki, T. Asari

    Proceedings of IABSE Nara 2015   466 - 467   2015.5

     More details

    Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:International Association for Bridge and Structural Engineering (IABSE)  

    Scopus

    researchmap

  • SEISMIC ENERGY RESPONSE OF TEN-STORY STEEL ROCKING FRAMES WITH COLUMN MID-HEIGHT UPLIFT AT FIRST STORY International journal

    M. Midorikawa, N. Kotani, T. Okazaki, T. Asari, Tadashi Ishihara, T. Azuhata

    Proceedings of 5th ECCOMAS, COMPDYN2015   3004 - 3013   2015.5

     More details

    Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:National Technical University of Athens  

    DOI: 10.7712/120115.3595.538

    Scopus

    researchmap

  • BENDING MECHANICAL PROPERTIES OF STEEL FURRING SUSPENDED CEILING SYSTEM Reviewed

    ISHIHARA Tadashi, INAI Shinsuke, MORITA Yasuhiro, WATAKABE Morimasa, WAKIYAMA Yoshio, KIKITSU Hitomitsu

    日本建築学会技術報告集   Vol. 21 ( No. 47 )   45 - 48   2015.2

     More details

    Authorship:Lead author   Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Architectural Institute of Japan  

    In the Great East Japan Earthquake, many suspended ceilings were damaged and fell down. If ceiling systems are attached to its surrounding walls and beams, in-plane compression strength of ceilings can be a primary factor of seismic design. By the results of compression tests, the strength is often limited by the buckling of ceiling as a composite plate. In this case, bending mechanical properties of ceiling system can be major factors of fragility against earthquakes. In this paper, bending stiffness and strength of steel furring suspended ceiling system are clarified by static bending tests.

    DOI: 10.3130/aijt.21.45

    CiNii Books

    CiNii Research

    researchmap

  • Analytical study on vibrational characteristics of out-of-plane behavior of large-scale partition walls with intermediate sub beams Reviewed

    石田 琢志, 石原 直, 渡壁 守正

    鋼構造年次論文報告集 Proceedings of constructional steel   22   328 - 333   2014.11

     More details

    Language:Japanese   Publisher:日本鋼構造協会  

    researchmap

  • Shaking table test on out-of-plane behavior of large-scale partition walls with intermediate sub beams Reviewed

    石原 直, 渡辺 貴樹, 石田 琢志

    鋼構造年次論文報告集 Proceedings of constructional steel   22   322 - 327   2014.11

     More details

    Language:Japanese   Publisher:日本鋼構造協会  

    researchmap

  • Strongmotionobservationonawarehousewithlarge-scale partitionwalls Reviewed

    石原 直, 渡壁 守正, 長谷川 隆

    鋼構造年次論文報告集 Proceedings of constructional steel   21   725 - 730   2013.11

     More details

    Language:Japanese   Publisher:日本鋼構造協会  

    researchmap

  • DYNAMIC CHARACTERISTICS OF A GYMNASIUM BEFORE AND AFTER THE 2011 OFF THE PACIFIC COAST OF TOHOKU EARTHQUAKE Reviewed

    WATAKABE Morimasa, Yotai Wakiyama, ISHIHARA Tadashi, IWATA Yoshihiro, INAI Shinsuke, ISHIOKA Taku, ISHIDA Takushi

    AIJ Journal of Technology and Design   Vol. 18 ( No. 40 )   865 - 870   2012.10

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Architectural Institute of Japan  

    This paper presents dynamic characteristics of a gymnasium determined from recorded strong-motion response data and from microtremor tests. The results show that the fundamental periods and corresponding percentages of critical damping before the 2011 off the Pacific coast of Tohoku Earthquake changed significantly after the severe Tohoku Earthquake. The data set collected during this study contributes to the evaluation of dynamic characteristics of large space structures.

    DOI: 10.3130/aijt.18.865

    CiNii Books

    CiNii Research

    researchmap

  • Modal Analysis of Dynamic Behavior of Buildings Allowed to Uplift at Mid-story International journal

    Tadashi Ishihara, T.Azuhata, M.Midorikawa

    Proceedings of 15th World Conference on Earthquake Engineering   Vol. ( No. )   Paper ID: 4635   2012.9

     More details

    Authorship:Lead author   Language:English   Publishing type:Research paper (international conference proceedings)  

    researchmap

  • Multi-dimensional Earthquake Response of Self-Centering Building Structural System Using Uplift Mechanism International journal

    T.Azuhata, Tadashi Ishihara, M.Midorikawa

    Proceedings of 15th World Conference on Earthquake Engineering   Vol. ( No. )   Paper ID: 1960   2012.9

     More details

    Language:English   Publishing type:Research paper (international conference proceedings)  

    researchmap

  • EVALUATION OF LATERAL AND BUOYANT FORCES ON REINFORCED CONCRETE BUILDINGS BY THE TSUNAMI OF THE 2011 EAST JAPAN EARTHQUAKE International journal

    T. Kabeyasawa, Y. Okuda, A. Fukai, H. Fukuyama, H. Kato, Tadashi Ishihara, S. Tajiri, M. Tani

    Proceedings of 15th World Conference on Earthquake Engineering   Vol. ( No. )   2012.9

     More details

    Language:English   Publishing type:Research paper (international conference proceedings)  

    researchmap

  • Damage Mechanism for High Strength Steel Part Frame without Diaphragm

    Y. Kimura, Tadashi Ishihara

    Proceedings of HPSM 2012, 6th International Conference on High Performance Structures and Materials   2012.6

     More details

    Language:English   Publishing type:Research paper (international conference proceedings)  

    researchmap

  • ALLOWABLE STRENGTH AND CYCLIC CHARACTERISTIC CONSIDERING OF STRESS CONCENTRATION OF PERFORATED BEAM MADE OF HIGH STRENGTH STEEL Reviewed

    Kikuo IKARASHI, Tadashi ISHIHARA, Fumihiko IGURO

    Journal of Structural and Construction Engineering (Transactions of AIJ)   Vol. 77 ( No. 675 )   755 - 763   2012.5

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Architectural Institute of Japan  

    DOI: 10.3130/aijs.77.755

    Scopus

    researchmap

  • AN EVALUATION OF TSUNAMI LOADS ON REINFORCED CONCRETE BUILDING STRUCTURES BASED ON DAMAGE INVESTIGATION IN 2011 TOHOKU EARTHQUAKE Reviewed

    toshikazu kabeyasawa, HIROSHI FUKUYAMA, Yasuo OKUDA, Hiroto KATO, Tadashi ISHIHARA, seitaro tajiri, Masanori Tani

    Journal of Structural Engineering   Vol. 58B   91 - 96   2012.3

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Architectural Institute of Japan  

    CiNii Books

    researchmap

  • Seismic Response of Uniaxially Eccentric Steel Frames Allowed to Uplift at Column-Bases Reviewed

    Naruo, W, Hasegawa, T, Midorikawa, M, Ishihara, T, Azuhata, T

    Journal of Constructional Steel   19   461 - 468   2011.11

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)  

    researchmap

  • DAMAGE MECHANISM AND STRUCTURAL PROPERTY FOR HIGH-STRENGTH-STEEL PARTIAL FRAME WITHOUT DIAPHRAGM Reviewed

    Yoshihiro KIMURA, Shinichi SHINOZAKI, Tadashi ISHIHARA

    Journal of Structural and Construction Engineering (Transactions of AIJ)   Vol. 75 ( No. 658 )   2221 - 2230   2011.2

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Architectural Institute of Japan  

    DOI: 10.3130/aijs.75.2221

    Scopus

    researchmap

  • Structural Design Requirement on the Tsunami Evacuation Buildings International journal

    Hiroshi Fukuyama, Hiroto Kato, Tadashi Ishihara, Seitaro Tajiri, Masanori Tani, Yasuo Okuda, Toshikazu Kabeyasawa, Yoshiaki Nakano

    Vol. ( No. )   2011

     More details

    Language:English   Publishing type:Research paper (international conference proceedings)  

    researchmap

  • CUMULATIVE CYCLIC DEFORMATION CAPACITY OF HIGH-STRENGTH STEEL FRAMES WITH ENERGY DISSPATION BRACES — Seismic performance of high-strength steel frames with energy dissipation braces Part 1 — Reviewed

    Toru TAKEUCHI, Tatsuya OHYAMA, Tadashi ISHIHARA

    Journal of Structural and Construction Engineering (Transactions of AIJ)   Vol. 75 ( No. 655 )   1671 - 1679   2010.9

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Architectural Institute of Japan  

    DOI: 10.3130/aijs.75.1671

    Scopus

    researchmap

  • Effect of Rotational Inertia on Dynamic Uplifting Behavior of Buildings Modeled as Uniform Shear-Beam International journal

    Tadashi Ishihara, T.Azuhata, M.Midorikawa

    Proceedings of 14th European Conference on Earthquake Engineering   Vol. ( No. )   2010.8

     More details

    Language:English   Publishing type:Research paper (international conference proceedings)  

    researchmap

  • THREE-DIMENSIONAL SHAKING TABLE TESTS ON THREE-STORY REDUCED-SCALE STEEL ROCKING FRAMES International journal

    M.Midorikawa, Tadashi Ishihara, T.Azuhata, H. Hori, T. Kusakari, T. Asari

    Proceedings of the 9th US National and 10th Canadian Conference on Earthquake Engineering 2010   Vol. ( No. )   Paper No. 385   2010.7

     More details

    Language:English   Publishing type:Research paper (international conference proceedings)  

    researchmap

  • HYSTERETIC CHARACTERISTICS AND PLASTIC DEFORMATION CAPACITY OF UPLIFT YIELDING BASE-PLATES FOR CONTROLLED ROCKING FRAMES Reviewed

    Mitsumasa MIDORIKAWA, Tatsuya HASEGAWA, Tadashi ISHIHARA, Tatsuya AZUHATA, Tetsuhiro ASARI

    Journal of Structural and Construction Engineering (Transactions of AIJ)   Vol. 75 ( No. 652 )   1159 - 1166   2010.6

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Architectural Institute of Japan  

    DOI: 10.3130/aijs.75.1159

    Scopus

    researchmap

  • Seismic Response and Estimation of Equivalent Damping Ratios of Structural Rocking Systems Using Simplified Models Reviewed

    MITSUMASA MIDORIKAWA, Takayoshi Kusakari, Tadashi Ishihara, Tetsuhiro Asari, Tatsuya Azuhata

    Journal of Structural Engineering   Vol. 56B   237 - 245   2010.3

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Architectural Institute of Japan  

    Previous studies have suggested that rocking vibration accompanied with foundation uplift motion might reduce the seismic damage of buildings subjected to severe earthquake motions. In this paper, the seismic response of simplified analytical models of rocking frames with column-bases allowed to uplift is evaluated by numerical analyses. The results are: 1)The base shear spectra for rocking models subjected to an earthquake motion demonstrate the definite reduction of base shear as compared to the fixed-base models over a certain range of natural period; 2) The total input energy exerted to rocking models during uplift motion is reduced by the amount of the incremental potential energy; and, 3) The vertical component of earthquake motions does not much affect the horizontal responses of rocking models but increases slightly their uplift response displacement.

    CiNii Books

    researchmap

  • Investigation of oscillatory properties of school gymnasiums Reviewed

    Yoshio WAKIYAMA, Masanobu TOHDO, Morimasa WATAKABE, Shinsuke INAI, Taku ISHIOKA, Koichi MORITA, Takashi HASEGAWA, Tadashi ISHIHARA, Masanori IIBA, Shinichi IIZUKA

    AIJ Journal of Technology and Design   Vol. 16 ( No. 32 )   91 - 96   2010.2

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Architectural Institute of Japan  

    DOI: 10.3130/aijt.16.91

    Scopus

    researchmap

  • THREE-DIMENSIONAL SHAKING TABLE TESTS ON SEISMIC RESPONSE OF REDUCED-SCALE STEEL FRAMES WITH YIELDING BASE PLATES ALLOWED TO UPLIFT Reviewed

    Mitsumasa MIDORIKAWA, Hirotake HORI, Tadashi ISHIHARA, Tatsuya AZUHATA, Takayoshi KUSAKARI, Tetsuhiro ASARI

    Journal of Structural and Construction Engineering (Transactions of AIJ)   Vol. 75 ( No. 647 )   213 - 221   2010.1

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Architectural Institute of Japan  

    DOI: 10.3130/aijs.75.213

    Scopus

    researchmap

  • Hysteretic Characteristics and Cumulative Plastic Deformation Capacity of Yielding Haunched Base Plates for Structural Rocking Systems Reviewed

    Asari, T, Hasegawa, T, Midorikawa, M, Azuhata, T, Ishihara, T

    Journal of Constructional Steel   17   121 - 126   2009.11

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)  

    researchmap

  • Basic Experimental Study on Seismic Uplifting Behavior of Single Story Structures with Plan Asymmetry about One Axis Reviewed

    Ishihara, T, Azuhata, T, Midorikawa, M

    Journal of Constructional Steel   17   115 - 120   2009.11

     More details

  • THREE-DIMENSIONAL SHAKING TABLE TESTS ON SEISMIC RESPONSE OF REDUCED-SCALE STEEL ROCKING FRAMES International journal

    M.Midorikawa, Tadashi Ishihara, T.Azuhata, H. Hori, T. Kusakari, T. Asari

    Proceedings of 3AESE   Vol. ( No. )   2009.10

     More details

    Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:EUCENTRE  

    Scopus

    researchmap

  • Seismic performance improvement of existing buildings by rocking structural system International journal

    T.Azuhata, T.Ishihara, M.Midorikawa, T.Miyake, K.Matsumoto, Tadashi Ishihara

    Proceedings of Stessa 2009   Vol. ( No. )   543 - 548   2009.8

     More details

    Language:English   Publishing type:Research paper (international conference proceedings)  

    researchmap

  • THREE-DIMENSIONAL SEISMIC RESPONSE OF TEN-STORY STEEL FRAMES WITH YIELDING BASE PLATES ALLOWED TO UPLIFT Reviewed

    緑川 光正, 須藤 智文, 麻里 哲広, 小豆畑 達哉, Tadashi Ishihara

    Journal of Structural and Construction Engineering   74 ( No. 637 )   495 - 502   2009.2

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:日本建築学会  

    DOI: 10.3130/aijs.74.495

    Scopus

    researchmap

  • Modal Analysis of Uplifting Behavior of Buildings Modeled as Uniform Shear-Beam International journal

    Tadashi Ishihara, M. Midorikawa, T. Azuhata

    Proceedings of 14th World Conference on Earthquake Engineering   Vol. ( No. )   05-06-0116   2008.10

     More details

    Language:English   Publishing type:Research paper (international conference proceedings)  

    researchmap

  • Earthquake Damage Reduction of Buildings by Self-Centering Systems Using Rocking Mechanism, International journal

    T. Azuhata, Tadashi Ishihara, M. Midorikawa

    Proceedings of 14th World Conference on Earthquake Engineering   Vol. ( No. )   05-06-0156   2008.10

     More details

    Language:English   Publishing type:Research paper (international conference proceedings)  

    researchmap

  • Seismic Response of Six-Story Eccentrically Braced Steel Frames with Columns Partially Allowed to Uplift Reviewed

    M. Midorikawa, S. Toyomaki, H. Hori, T. Asari, T. Azuhata, T. Ishihara

    Proceedings of 14th World Conference on Earthquake Engineering   2008.10

     More details

    Language:English   Publishing type:Research paper (international conference proceedings)  

    researchmap

  • Proposal of Seismic Performance Evaluation Method for Innovative Building Structures using High Strength Steel International journal

    A. Mukai, T. Azuhata, Tadashi Ishihara

    Vol. ( No. )   2008.5

     More details

    Language:English   Publishing type:Research paper (international conference proceedings)  

    researchmap

  • SEISMIC RESPONSE OF ECCENTRICALLY BRACED STEEL FRAMES WITH PARTIAL COLUMNS ALLOWED TO UPLIFT Reviewed

    MIDORIKAWA Mitsumasa, TOYOMAKI Shingo, HORI Hirotake, ASARI Tetsuhiro, AZUHATA Tatsuya, ISHIHARA Tadashi

    Journal of Structural Engineering   Vol. 54B   535 - 545   2008.3

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Architectural Institute of Japan  

    Previous studies have suggested that rocking vibration accompanied with uplift motion might reduce the seismic damage of buildings subjected to severe earthquake motions. In this paper, the seismic response of eccentrically braced steel frames with partial columns allowed to uplift is evaluated and compared with that of fixed-base frame by numerical analyses, whose prototype test frame of a full-scale six-story eccentrically braced steel building structure was tested by pseudo-dynamic testing technique in Tsukuba in 1982 to 1984. The results show that the base shears in the frames with column uplift are significantly reduced as compared to the fixed-base frames.

    CiNii Books

    researchmap

  • Self-centering building system composed of rocking structural members

    T. Azuhata, T. Ishihara, M. Midorikawa

    Proceedings of the World Forum on Smart Materials and Smart Structures Technology, SMSST'07   378   2008

     More details

    Language:English   Publishing type:Research paper (international conference proceedings)  

    Scopus

    researchmap

  • Two Dimensional Analysis of One Story 1x1 Bay Elastic Models Allowed to Uplift with Plan Asymmetry about One Axis Reviewed

    Ishihara, T, Azuhata, T, Midorikawa, M

    Journal of Constructional Steel   15   489 - 492   2007.11

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)  

    researchmap

  • Hysteretic Characteristics and Cumulative Plastic Deformation Capacity of Yielding Base Plates for Structural Rocking Systems Reviewed

    Sudo, T, Ishihara, T, Azuhata, T, Midorikawa, M

    Journal of Constructional Steel   15   493 - 498   2007.11

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)  

    researchmap

  • Effect of Yielding Base Plate on the Seisimic Responses of Braced Frame Allowed to Uplift Reviewed

    Suzuki, T, Ishihara, T, Azuhata, T, Midorikawa, M

    Journal of Constructional Steel   15   481 - 488   2007.11

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)  

    researchmap

  • Effect of impulsive force on earthquake response of rocking structural systems International journal

    T. Azuhata, T. Ishihara, M. Midorikawa, Tadashi Ishihara

    Earthquake Resistant Engineering Structures Ⅵ   Vol. ( No. )   459 - 468   2007.6

     More details

    Language:English   Publishing type:Research paper (international conference proceedings)  

    DOI: 10.2495/ERES070441

    Web of Science

    researchmap

  • Shaking table test on seismic response of reduced scale models of multi-story buildings allowed to uplift International journal

    Tadashi Ishihara, T. Azuhata, K. Noguchi, K. Morita, M. Midorikawa

    Earthquake Resistant Engineering Structures Ⅵ   Vol. ( No. )   175 - 184   2007.6

     More details

    Authorship:Lead author   Language:English   Publishing type:Research paper (international conference proceedings)  

    DOI: 10.2495/ERES070171

    Web of Science

    researchmap

  • Seismic response three-dimensional analysis of ten-story frames with column uplift International journal

    M. Midorikawa, T. Azuhata, Tadashi Ishihara

    Earthquake Resistant Engineering Structures Ⅵ   Vol. ( No. )   165 - 174   2007.6

     More details

    Language:English   Publishing type:Research paper (international conference proceedings)  

    researchmap

  • Coupled Vibration Control System for Slender Buildings Constructed Closely in Urban Area International journal

    T. Azuhata, Tadashi Ishihara, M. Midorikawa

    Proceedings of SPIE, Sensors and Smart Structures Technologies for Civil, Mechanical and Aerospace Systems 2007   Vol. 6529 ( No. )   65293A-1-8   2007.3

     More details

    Language:English   Publishing type:Research paper (international conference proceedings)  

    DOI: 10.1117/12.715864

    Web of Science

    researchmap

  • Shaking Table Test on Uplifting Responses of Reduced-scale Models of Multi-story Buildings Considering Story Stiffness Distribution Reviewed

    Ishihara, T, Azuhata, T, Noguchi, K, Morita, K, Midorikawa, M

    Journal of Constructional Steel   14   327 - 334   2006.11

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)  

    researchmap

  • Effect of dampers on dynamic behavior of structures allowed to uplift International journal

    Tadashi Ishihara, T. Azuhata, M. Midorikawa

    Proceedings of Stessa 2006   Vol. ( No. )   709 - 715   2006.8

     More details

    Language:English   Publishing type:Research paper (international conference proceedings)  

    Scopus

    researchmap

  • Seismic response reduction of steel frames with multi-spans by applying rocking structural system International journal

    T. Azuhata, Tadashi Ishihara, M. Midorikawa, A. Wada

    Proceedings of Stessa 2006   Vol. ( No. )   659 - 664   2006.8

     More details

    Language:English   Publishing type:Research paper (international conference proceedings)  

    Scopus

    researchmap

  • Vibration Characteristics and Dynamic Behavior of Multiple Story Buildings Allowed to Uplift International journal

    Tadashi Ishihara, M. Midorikawa, T. Azuhata

    Proceeding of SPIE, Smart Structures and Material 2006, Damping and Isolation   Vol. 6169 ( No. )   61691A-1-8   2006.2

     More details

    Authorship:Lead author   Language:English   Publishing type:Research paper (international conference proceedings)  

    DOI: 10.1117/12.658465

    Web of Science

    researchmap

  • Seismic response reduction of buildings by rocking structural systems with adaptive dampers International journal

    T. Azuhata, M. Midorikawa, Tadashi Ishihara

    Proceeding of SPIE, Smart Structures and Material 2006, Damping and Isolation   Vol. 6169 ( No. )   61691B-1-9   2006.2

     More details

    Language:English   Publishing type:Research paper (international conference proceedings)  

    DOI: 10.1117/12.658420

    Web of Science

    researchmap

  • Hysteresis Characteristics of Large-scale Column Base for Rocking Structural Systems Reviewed

    Ishihara, T, Midorikawa, M, Azuhata, T, Wada, A

    Journal of Constructional Steel   13   381 - 384   2005.11

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)  

    researchmap

  • Tornado Disaster in Saga Prefecture, Japan on June 27, 2004

    Junji Maeda, Eriko Tomokiyo, Nobuyuki Ishida, Yasuo Okuda, Hitomitsu Kikitsu, Tomonori Murakami, Tadashi Ishihara, Masahiro Matsui, Yukio Tamura, Kichiro Kimura

    Proceedings of The Sixth Asia-Pacific Conference on Wind Engineering (APCWE-Ⅵ)   6   2874 - 2887   2005.9

     More details

  • The seismic energy dissipation mechanism of rocking structural systems with yielding base plates International journal

    T. Azuhata, M. Midorikawa, Tadashi Ishihara

    Earthquake Resistant Engineering Structures V   Vol. ( No. )   343 - 354   2005.5

     More details

    Language:English   Publishing type:Research paper (international conference proceedings)  

    Web of Science

    researchmap

  • Seismic response analyses of rocking structural systems with yielding base plates by the finite element method International journal

    M. Midorikawa, T. Azuhata, Tadashi Ishihara, A. Wada

    Earthquake Resistant Engineering Structures V   Vol. ( No. )   333 - 341   2005.5

     More details

    Language:English   Publishing type:Research paper (international conference proceedings)  

    Web of Science

    researchmap

  • Seismic response analyses of rocking structural systems with yielding base plates by the finite element method

    M. Midorikawa, T. Azuhata, T. Ishihara, A. Wada

    WIT Transactions on the Built Environment   81   333 - 341   2005

     More details

    Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:WITPress  

    Scopus

    researchmap

  • The seismic energy dissipation mechanism of rocking structural systems with yielding base plates

    T. Azuhata, M. Midorikawa, T. Ishihara

    WIT Transactions on the Built Environment   81   343 - 354   2005

     More details

    Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:WITPress  

    Scopus

    researchmap

  • ENERGY DISSIPATION MECHANISM AND MAXIMUM RESPONSE DISPLACEMENT PREDICTION OF STEEL FRAMES WITH YIELDING BASE PLATES IN UPLIFT MOTION FOR SEISMIC RESPONSE REDUCTION Reviewed

    Tatsuya AZUHATA, Mitsumasa MIDORIKAWA, Tadashi ISHIHARA

    Journal of Structural and Construction Engineering (Transactions of AIJ)   Vol. 69 ( No. 583 )   61 - 68   2004.9

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Architectural Institute of Japan  

    Energy dissipation mechanism of base plate yielding systems is investigated based on results of shaking table tests using a half scale steel frame with three stories. Hysteresis damping capacity of yielding base plates is verified. And effects of vertical inertia force to the energy dissipation mechanism which include impact effects are clarified. The energy dissipation of the system corresponding to the maximum momentary input energy is expressed using the maximum rigid rotational anele. The maximum response displacements are predicted considering the energy balance condition of the system.

    DOI: 10.3130/aijs.69.61_2

    CiNii Books

    researchmap

  • SEISMIC RESPONSE PREDICTION OF STEEL FRAMES WITH HYSTERETIC DAMPERS BASED ON ENERGY BALANCE Reviewed

    Takashi HASEGAWA, Isao NISHIYAMA, Akiyoshi MUKAI, Tadashi Ishihara, Hisaya KAMURA

    Journal of Structural and Construction Engineering (Transactions of AIJ)   Vol. 69 ( No. 582 )   147 - 154   2004.8

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Architectural Institute of Japan  

    This paper presents a seismic response prediction method for steel frames with hysteretic dampers. This method is based on energy balance and is able to predict the seismic response of frames with dampers yielding under an earthquake to occur several times during the life of buildings. In this method, the number (_dn_l) of eauivalent cycles of plastic deformation in hysteretic dampers is utilized to predict earthquake response of frames with hysteretic dampers. In order to grasp the _dn_l values, earthquake response analysis of analytical frames with hysteretic dampers is carried out. And, the adequacy of seismic response prediction by this method is verified through a comoarison with results of earthquake response analysis of three different story frames.

    DOI: 10.3130/aijs.69.147_2

    CiNii Books

    researchmap

  • Simplified Prediction Method for Seismic Response of Rocking Structural Systems with Yielding Base Plates International journal

    T. Azuhata, M. Midorikawa, Tadashi Ishihara, A. Wada

    Proceedings of 13th World Conference on Earthquake Engineering   Vol. ( No. )   Paper No. 371   2004.8

     More details

    Language:English   Publishing type:Research paper (international conference proceedings)  

    researchmap

  • DYNAMIC BEHAVIOR OF. STEEL FRAMES WITH YIELDING BASE PLATES IN UPLIFT MOTION FOR SEISMIC RESPONSE REDUCTION Reviewed

    Mitsumasa MIDORIKAWA, Tatsuya AZUHATA, Tadashi ISHIHARA, Akira WADA

    Journal of Structural and Construction Engineering (Transactions of AIJ)   Vol. 68 ( No. 572 )   97 - 104   2003.10

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Architectural Institute of Japan  

    Shaking table tests are carried out to examine the seismic response of structural systems with yielding base plates using a half scale steel frame with three stories and one bay. During a strong earthquake, these systems cause rocking vibration with the base plates yielding to reduce the seismic response. In the test, the seismic response of base plate yielding systems are compared with that of fixed base systems. Furthermore, simplified methods are proposed to predict their seismic responses, which are vertical stress at column bases, uplift displacements, base shears and roof displacements.

    DOI: 10.3130/aijs.68.97_3

    CiNii Books

    researchmap

  • Shaking table tests on earthquake response reduction effects of rocking structural systems Reviewed

    M Midorikawa, T Azuhata, T Ishihara, Y Matsuba, A Wada

    SMART STRUCTURES AND MATERIALS 2003: DAMPING AND ISOLATION   5052   277 - 286   2003

     More details

    Language:English   Publishing type:Research paper (international conference proceedings)  

    Web of Science

    researchmap

  • Earthquake response reduction of buildings by rocking structural systems Reviewed

    Mitsumasa Midorikawa, Tatsuya Azuhata, Tadashi Ishihara, Yutaka Matsuba, Yoshiyuki Matsushima, Akira Wada

    Proceedings of SPIE - The International Society for Optical Engineering   4696   265 - 272   2002

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1117/12.472562

    Scopus

    researchmap

  • A STUDY ON STRUCTURAL PROPOERTIES OF ECCENTRICALLY JOINTED SPACE TRUSS GRIDS WITH SHEAR PANELS Reviewed

    鈴木 敏郎, 今井 一郎, Tadashi Ishihara

    Transactions of AIJ   Vol. 65 ( No. 535 )   95 - 100   2000.9

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:日本建築学会  

    In this paper, we propose a method of improving the deformation capacity of truss grids, without the loss of initial stiffness and load bearing capacity. Shear panels are introduced into the eccentric joint areas To investigate the behavior of the trusses, numerical analysis is carried out using X-braced models for shear panels As a result, it is cleared that such trusses show stable elasto-plastic behavior, keeping their initial stiffness and maximum strength as high as those of ordinary trusses. And the present method improves hysteresis characteristics of truss grids under cyclic loading.

    DOI: 10.3130/aijs.65.95_5

    CiNii Books

    researchmap

  • A STUDY ON STRUCTURAL PROPERTIES OF SPACE TRUSS GRIDS WITH ECCENTRIC MEMBERS Reviewed

    鈴木 敏郎, Tadashi Ishihara

    Transactions of AIJ   Vol. 65 ( No. 534 )   73 - 78   2000.8

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:日本建築学会  

    Double layer space truss grids can cause spreading member failures and progressive collapse. To improve this brittle-type post-buckling behavior, we have proposed to introduce eccentric joints in compressive chord members. In this study, structural properties of space truss grids with eccentric members are investigated by numerical analysis. Eccentric joints shed the compressive force of critical chord members to other under-stressed members, and different collapse mechanisms are formed. They make the behavior in post-buckling range stabler. In some cases, load carrying capacity of eccentric jointed trusses can be higher than that of ordinary trusses.

    DOI: 10.3130/aijs.65.73_2

    CiNii Books

    researchmap

  • A STUDY ON STRUCTURAL PROPERTIES OF TRUSS BEAMS WITH ECCENTRIC JOINTS UNDER THE CYCLIC LOAD Reviewed

    Toshiro SUZUKI, Kikuo IKARASHI, Ichiro IMAI, Tadashi ISHIHARA

    Transactions of AIJ   Vol. 65 ( No. 530 )   191 - 198   2000.4

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:日本建築学会  

    In this study, hysteretic characteristics of eccentric jointed truss beams under the cyclic load are investigated by experiments. It is clear that eccentric joints control the buckling of chord member. Chord member buckling deformation is not large easily under cyclic load for eccentric joints. So eccentric jointed truss beams have very stable hysteretic characteristic. And the eccentric jointed truss beams with shear panels are investigated. As a results, it is clear that the shear panels improve the hysteretic characteristic of truss beams. Because the diagonal tension occurs at effective and stable direction in shear panels under cyclic load.

    DOI: 10.3130/aijs.65.191_1

    CiNii Books

    researchmap

  • A STUDY ON STRUCTURAL PROPERTIES OF TRUSS BEAMS WITH SHEAR PANELS Reviewed

    鈴木 敏郎, 五十嵐 規矩夫, 今井 一郎, Tadashi Ishihara

    Transactions of AIJ   Vol. 64 ( No. 526 )   185 - 192   1999.12

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:日本建築学会  

    In this study, the truss beam with the eccentric joints and shear panels is proposed to improve the plastic deformation capacity. Eccentric joints and shear panels are intended to disperse plastic deformation in truss beam and to transform the buckling mode. Mechanical properties of this truss beam are investigated by the loading test and the numerical analysis. As a result, initial stiffness and maximum strength of the truss beam with shear panels are equated with ones of the ordinary truss beam, and plastic deformation behavior is very stable. And shear panel form and arrangement are able to choose suitably.

    DOI: 10.3130/aijs.64.185_2

    CiNii Books

    researchmap

  • A STUDY ON STRUCTURAL PROPERTIES OF SPACE TRUSS BEAMS WITH ECCENTRIC MEMBERS : In cases where eccentric members yield Reviewed

    Toshiro SUZUKI, Toshiyuki OGAWA, Tadashi ISHIHARA

    Transactions of AIJ   Vol. 64 ( No. 526 )   101 - 108   1999.12

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:日本建築学会  

    In this paper, structural properties of truss beams with eccentric members are investigated by numerical analysis. The analytical parameters are the length and properties of the eccentric members. As a result, it is cleared that the plastic deformation behavior of such truss beams is improved, if the eccentric members yield before the critical chord member buckles. The initial stiffness and the maximum strength do not largely depend on the sectional properties of eccentric members. The slenderness ratio of the eccentric members can be a deciding factor not only in the yield load but also in the plastic deformation capacity.

    DOI: 10.3130/aijs.64.101_4

    CiNii Books

    researchmap

  • A STUDY ON STRUCTURAL PROPERTIES OF TRUSS BEAMS WITH ECCENTRIC JOINTS Reviewed

    Toshiro SUZUKI, Ichiro IMAI, Tadashi ISHIHARA

    Transactions of AIJ   Vol. 64 ( No. 519 )   103 - 109   1999.5

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:日本建築学会  

    We have proposed the trusses with eccentric joints to improve the post-buckling behavior. It is confirmed that the trusses with eccentric joints show stable behavior, although their initial stiffness and ultimate strength are not so high as those of ordinary trusses. In this paper, loading tests and numerial analyses are carried out to investigate the effect of lattice patterns (warren or double-warren) on ultimate strength and plastic deformation behavior of truss beams with several types of eccentric joints. As a result, double-warren trusses with eccentric joints show stable behavior, keeping their load bearing capacity high enough.

    DOI: 10.3130/aijs.64.103_2

    CiNii Books

    researchmap

  • A STUDY ON STRUCTURAL PROPERTIES OF DOUBLE LAYER SPACE TRUSS WITH ECCENTRIC JOINTS IN COMPRESSIVE CHORD MEMBERS Reviewed

    鈴木 敏郎, 小河 利行, 木村 祥裕, Tadashi Ishihara

    Transactions of AIJ   Vol. 62 ( No. 497 )   181 - 188   1997.7

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:日本建築学会  

    The space truss is subject to failure by the member buckling of compressive chord members. After buckling, a member loses most of its strength, shedding force to neighbor members. This causes spreading member failures and a progressive collapse, which could take only seconds to develop. We propose a method to control collapse mechanism to improve the plastic deformation capacity of the space truss. The method is to use the compressive chord members with eccentric joints in space truss. We clarified the structural properties of this space truss by experiment and numerical analysis.

    DOI: 10.3130/aijs.62.181_1

    CiNii Books

    researchmap

▼display all

Books

MISC

▼display all

Presentations

▼display all

Awards

  • Encouragement Prize of AIJ

    2011.8   Architechtural Institute of Japan  

     More details

  • Prize

    2010.11   Japan Society of Steel Construction  

     More details

Research Projects

  • 偏心のある建物に設置される天井の地震応答評価

    Grant number:23H01550  2023.4 - 2027.3

    日本学術振興会  科学研究費助成事業  基盤研究(B)

    石原 直, 吉敷 祥一, 沖 佑典

      More details

    Grant amount:\18330000 ( Direct Cost: \14100000 、 Indirect Cost:\4230000 )

    researchmap

  • 偏心のある建物に設置される天井の地震応答評価

    Grant number:23K26244  2023.4 - 2027.3

    日本学術振興会  科学研究費助成事業  基盤研究(B)

    石原 直, 吉敷 祥一, 沖 佑典

      More details

    Grant amount:\18330000 ( Direct Cost: \14100000 、 Indirect Cost:\4230000 )

    天井の地震力等に対する構造躯体の偏心の影響に関しては、理想化した構造躯体のモデルを設定し、小規模の部屋を想定した「単点入力」、大規模の部屋を想定した「多点入力」の理論を整理し、応答解析用プログラムを構築した。両者とも線形応答を対象として、構造躯体のモード解析を基に、固有モード別に天井に与える影響を評価し、重ね合わせることで天井の地震応答を評価した。2023年度は建物が単層(1階建て)の場合に絞って検討を行った。理論の整理に当たっては、申請者の既往の研究も参考として、固有周期や刺激関数等として表現される各モードの振動特性を求めるための図解法も示し、各種パラメータの影響を図として表示して理解しやすくした。構造躯体のパラメータは、弾力半径比(質量と剛性の平面的な分布を表す指標の比)、偏心の大きさ、固有周期などである。天井のパラメータは固有周期に加え、「多点入力」では建物内での平面的な位置と建物との平面的大きさの比である。応答解析の結果から、構造躯体の偏心が大きくなると地震力も大きくなるが、偏心がない場合に比べて最大でも1.2倍程度に収まり、偏心によって極端に大きくなることはないことなどを明らかにした。
    また、不均等な外力を受けた場合の天井の耐力・剛性、損傷・破壊形態を検討するため、小規模な試験体に対して偏心した水平荷重を与える実験を行った。試験体はいわゆる在来工法の耐震天井で、平面寸法は約3m×約3mとした。集中荷重の作用位置を変えた3体の実験結果から、天井の初期剛性や最大耐力等に与える荷重の偏心の影響はさほど大きくないことを確かめた。

    researchmap

  • 高耐震性を有する直接基礎建物を可能とする既存杭を活用した複合地盤の開発

    Grant number:20H02306  2020.4 - 2024.3

    日本学術振興会  科学研究費助成事業  基盤研究(B)

    柏 尚稔, 石原 直, 中川 博人, 大村 早紀

      More details

    Grant amount:\17680000 ( Direct Cost: \13600000 、 Indirect Cost:\4080000 )

    都市の再生の機運が高まっている中において、建物の建替えを計画する際には既存杭の処理が大きな問題となる。しかし、既存杭を有用物として捉えて再利用することができれば、環境負荷の問題に対して多大な貢献が可能となる。さらに、既存杭を含む敷地地盤に対する適切な補強により地盤の支持力を高めて、新築建物の基礎形式を直接基礎として設計できれば、浮き上がり挙動など建物の損傷低減に繋がる現象を利用して、極大地震に対してレジリエントな建物の設計機構を実現することも可能と考えられる。本研究課題では、既存杭と地盤の両方が安定的な支持力を発揮できる複合地盤の設計法を示すとともに、複合地盤上の建物の巨大地震に対するレジリエンスの評価手法を提案することを目的としている。今年度の成果は次の通りである。
    ・せん断土槽と遠心載荷装置を用いて、埋め込みを有する直接基礎建物の振動台実験を実施した。模型地盤としては砂質土を用い、直接基礎、地中杭あり直接基礎、杭基礎の実験を実施した。
    ・実験では、既存杭の有無が建物の地震応答に及ぼす影響は小さく、杭頭絶縁基礎を適用した建物の地震応答は直接基礎のそれと同等である一方、杭頭絶縁基礎建物の弾性変形成分は杭基礎建物のそれより小さくなることが分かった。
    ・杭頭絶縁基礎建物の地震応答が大きくなると、深部での地中の杭の軸力は杭頭部よりも大きく変動するため、杭頭だけでなく、杭周面摩擦抵抗が建物に対する杭頭絶縁基礎の支持性能に寄与する可能性が示唆されることを示した。

    researchmap

  • Fundamental study on seismic design of building structures allowed to uplift considering dynamic soil-structure interaction

    Grant number:16K06601  2016.4 - 2019.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

    ISHIHARA tadashi

      More details

    Grant amount:\4810000 ( Direct Cost: \3700000 、 Indirect Cost:\1110000 )

    By shaking table tests using two types of building models with three different soil conditions, it was clarified that (1) higher mode vibrations during uplift excursions are not seen much in a soft ground while those vibrations appear remarkably in a rigid ground, and (2) the damage of the superstructure is suppressed in a soft ground and the residual deformation is relatively small.
    And by earthquake response analysis using a computer program created by us, amounts and distributions of seismic forces and so on were grasped.

    researchmap

  • Evaluation of stability of lightweight steel sheet steel structure and its application to efficient shape and form development of earthquake resistant structure

    Grant number:26289189  2014.4 - 2017.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    Ikarashi Kikuo, SATOU ATSUSHI, ISHIHARA TADASHI, TOMIOKA YOSHITO

      More details

    Grant amount:\16380000 ( Direct Cost: \12600000 、 Indirect Cost:\3780000 )

    This study focuses primarily on corrugated steel plates, steel plate sandwich panels, and cold-formed channel section members to evaluate their stability and seismic performance.
    These evaluations confirmed the properties of the materials constituting the members, and specified the relationship of the material properties of the members with the structural properties. Performing theoretical analysis, numerical analysis, and loading test clarified the structural properties of the members according to boundary conditions, connection conditions, and loading conditions of the members. Moreover, a performance evaluation formula was derived that would contribute to rational design methods.
    A structural form by appropriately combining thin plate members was proposed and showed the future development and potential of the thin plate structure type through trial construction experiment.

    researchmap

  • Seismic Performance of Rocking Frames with Column Mid-height Uplift Mechanism at the First Story

    Grant number:25289177  2013.4 - 2016.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    Midorikawa Mitsumasa, ASARI Tetsuhiro, AZUHATA Tatsuya, ISHIHARA Tadashi, OKAZAKI Taichiro

      More details

    Grant amount:\18070000 ( Direct Cost: \13900000 、 Indirect Cost:\4170000 )

    The steel frames with column mid-height uplift (CMU) mechanism at the first story are implemented as response-control structural systems that reduce the seismic effects by exploiting the gravity effect generally deteriorating the seismic performance of ordinary structures. In the previous studies, the reduction effect on the seismic response of the column-base uplift (CBU) rocking systems with columns allowed to uplift has been evaluated and examined. The advantages and disadvantages of the systems have also been discussed. This study presents the seismic performance of CMU rocking frames with emphasis on the fundamental mechanical properties of CMU frames based on the simplified analytical models, performance evaluation of CMU mechanism resulted from the cyclically static loading tests and the seismic response behavior of CMU frames. Finally, some suggestions and recommendations are made on the seismic design of the rocking systems.

    researchmap

  • Seismic design method for suspended ceiling and facilities equipment

    Grant number:24246094  2012.4 - 2015.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (A)

    MOTOYUI Shojiro, MIZUTANI Kunio, WAKIYAMA Yoshio, ISHIHARA Tadashi, YAMASHITA Tetsuo, NISHIKAWA Toyohiro

      More details

    Grant amount:\44200000 ( Direct Cost: \34000000 、 Indirect Cost:\10200000 )

    For the sake of mitigation for suspended ceiling and facilities equipment, the experimental and numerical studies are done to clarify the characteristics of typical style of them. For suspended ceilings, two types of accurate or convenient numerical methods are suggested to calculate the displacement and stresses and the validation is shown by comparison with experimental results. Furthermore, the pulling out strength and the shear strength of screws which are used for ceiling board to be attached to steel furring, are clarified quantitatively. For facilities equipment, the low cycle fatigue of a hanging bolt is considered as an actual serious damage type and the condition for such damage is summarized. Furthermore, the behavior of facilities equipment with braces is examined through the shaking table test and it is shown that the low cycle fatigue is occurred and the usual connection type of braces has some problems.

    researchmap

  • Fundamental study on damage reduction effect and required strength in buildings allowed to uplift

    Grant number:24560707  2012.4 - 2015.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

    ISHIHARA Tadashi, AZUHATA Tatsuya, MIDORIKAWA Mitsumasa

      More details

    Grant amount:\5330000 ( Direct Cost: \4100000 、 Indirect Cost:\1230000 )

    Structures allowed to uplift can reduce seismic forces in comparison with fixed ones. However, relatively high strength is required to avoid any damage due to higher modes’ vibrations. Even if structures are allowed not only to uplift but also to go into elasto-plastic range, ductility demand may be reduced by potential energy in uplift motion. In this study, dynamic elasto-plastic behaviors accompanied by uplift are investigated by analysis and shaking table test. As a result, it is clarified that allowing uplift can reduce damage of structures. Required strength to avoid serious damage is a little bit higher than that of initiation of uplift.

    researchmap

  • Development and Application oSfeismically Response-control

    Grant number:22360219  2010 - 2012

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    MIDORIKAWA Mitsumasa, ASARI Tetsuhiro, AZUHATA Tatsuya, ISHIHARA Tadashi, OKAZAKI Taichiro

      More details

    Grant amount:\17420000 ( Direct Cost: \13400000 、 Indirect Cost:\4020000 )

    The steel frames with uplift column-bases are implemented as response-control structural systems that reduce the seismic effects by exploiting the gravity effect generally deteriorating the seismic performance of ordinary structures. The reduction effect on the seismic response of the base-plate-yielding (BPY) rocking systems with columns allowed to uplift has been evaluated and examined. The advantages and disadvantages of the systems have also been discussed. This study presents the seismic response characteristics with emphasis on the torsional behavior of the BPY systems and proposes the advanced rocking systems resolving the disadvantage of the BPY systems towards developing and applying widely the rocking structural systems. Finally, some suggestions and recommendations are made on the seismic design of the rocking systems.

    researchmap

  • Basic Study on Development of Response Controlled System with Uplift Mechanism

    Grant number:21560607  2009 - 2011

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

    ISHIHARA Tadashi, AZUHATA Tatsuya, MIDORIKAWA Mitsumasa

      More details

    Grant amount:\4680000 ( Direct Cost: \3600000 、 Indirect Cost:\1080000 )

    To utilize the seismic-force reduction effect due to uplift to a wider range of buildings, three types of response controlled systems are investigated in this study. Those systems are(1) Systems allowed to uplift at mid-story,(2) Systems allowed to uplift with narrower span of column/support than the width, and(3) Systems with multi spans. For(1) and(2), analytical study is done using uniform shear-beam model to clarify those vibration characteristics and dynamic behaviors. Then shaking table tests are conducted to investigate the seismic responses and reduction effect by uplift motion. For(3), a self-centering structural system is proposed and seismic response analysis is carried out to investigate the multi-dimensional responses using an application example. The results show the distinctive higher-mode vibration and reduction effect due to uplift in those systems.

    researchmap

  • Characterization and Treatment of Various Factors Detrimental to Passive Control Effectiveness for Buildings

    Grant number:19206058  2007 - 2010

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (A)

    KASAI Kazuhiko, MOTOYUI Shojiro, SAKATA Hiroyasu, OOKI Yoji, ISHIHARA Tadashi

      More details

    Grant amount:\45240000 ( Direct Cost: \34800000 、 Indirect Cost:\10440000 )

    Incorrect and unconservative estimates for either damage or safety limit can result during design of passive control system for buildings. The present study has characterized and treated various factors detrimental to passive control effectiveness in the following two ways :
    (1) Effects of balance between frame and damper are clarified based on their detailed analyses and full-scale experiments.
    (2) Various methods are proposed for design, evaluation, and analysis of the passively-controlled buildings, as well as for treatment of various factors detrimental to passive control effectiveness.

    researchmap

  • Evaluation of Collapse Capacity and Effect of Damage Distribution of for Redundancy System

    Grant number:19560574  2007 - 2009

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

    KIMURA Yoshihiro, ISHIHARA Tadashi

      More details

    Grant amount:\4420000 ( Direct Cost: \3400000 、 Indirect Cost:\1020000 )

    There are some differences in the steel structures from the view of seismic designs between U.S.and Japan. Japanese typical frames are spatial moment resisting frames. U.S. frames are the perimeter frames, and the columns inside the frames are designed as the gravity columns which support only the weight of the buildings. Such columns may divide the shear force over the height of the frame and work as the damage control systems. This study clarifies the drift deformation concentration for the standard steel moment resistant frames in U.S.and Japan. The equations for the drift concentration are developed under the equilibrium conditions, and compared with the push over analyses results.

    researchmap

  • Development of Seismic Design Method for Response-control Structural Systems of Steel Frames under Overturning-moment Control

    Grant number:19360244  2007 - 2009

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    MIDORIKAWA Mitsumasa, AZUHATA Tatsuya, ISHIHARA Tadashi, ASARI Tetsuhiro

      More details

    Grant amount:\20150000 ( Direct Cost: \15500000 、 Indirect Cost:\4650000 )

    One of the advantages of response-control structural systems of steel frames with uplift column-bases under overturning moment control is that the seismic response of the systems is reduced by making use of vertical loads generally deteriorating the seismic performance of ordinary structures. Evaluated and examined are the plastic deformation capacity of column bases with uplift-yielding base plates, the seismic response characteristics of the systems such as multi-span and braced frames, the three-dimensional seismic behavior of the systems, and seismic energy response of the systems. The fundamental seismic design method of the systems is established through summarizing the results of this study.

    researchmap

  • Fundamental Study on Uplift Responses of Buildings with Plan Asymmetry

    Grant number:19560590  2007 - 2008

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

    ISHIHARA Tadashi, AZUHATA Tatsuya, MIDORIKAWA Mitsumasa

      More details

    Grant amount:\4550000 ( Direct Cost: \3500000 、 Indirect Cost:\1050000 )

    researchmap

  • Fundamental study on failsafe structural systems against large earthquakes using uplift mechanism

    Grant number:18560572  2006 - 2007

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

    AZUHATA Tatsuya, ISHIHARA Tadashi, MIDORIKAWA Mitsumasa

      More details

    Grant amount:\4010000 ( Direct Cost: \3500000 、 Indirect Cost:\510000 )

    This study aims to investigate possibility and efficiency of a failsafe structural system using uplift mechanism to make buildings safety even against larger earthquake response effects than those estimated with ordinal seismic design codes. Previous studies have cleared that rocking vibration accompanied with uplift motion might reduce the seismic damage of buildings subjected sever earthquake motions. The proposed fat-1mi. system is based on this knowledge. This system shows seismic response characteristics of a fixed column base system under certain seismic input leveL But it starts rocking once the seismic input level exceeds the limit. Uplift response due to the rocking will restrain ascent of seismic input to the structures.
    Firstly, to introduce uplift mechanism to building structures, the following research items were studied.
    1) Steel frame systems utilizing uplift mechanism
    2) Restoring force characteristics of column bases to make steel frames uplift
    Secondary, to develop more appropriate seismic performance evaluation methods for rocking structures, the following research items were studied.
    3) Seismic lateral force distribution of rocking structures
    4) Effect of floor incline during an earthquake to indoor objects in rocking structures Finally, the following research item was studied based on earthquake response analyses using simplified building structural models.
    5) Efficiency of the proposed failsafe system using uplift mechanism against sever earthquake ground motions
    Through these studies, some frame systems and structural members for rocking structures were proposed and uplift response characteristics were analyzed quantitatively. And the efficiency of the proposed failsafe system against sever earthquakes was confirmed. When we apply this system to buildings with a high aspect ratio, it can provide them superior seismic performance, which is almost equal to that of passive vibration control systems with hysteresis dampers.

    researchmap

  • Seismic Performance Evaluation of Controlled Rocking Building Structures with Yielding Base Plates

    Grant number:16360284  2004 - 2006

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    MIDORIKAWA Mitsumasa, AZUHATA Tatsuya, ISHIHARA Tadashi, WADA Akira

      More details

    Grant amount:\15000000 ( Direct Cost: \15000000 )

    Past studies have pointed out that the effects of rocking vibration accompanied with uplift motion might reduce the seismic damage of buildings subjected to strong earthquake ground motions. Based on these studies, structural systems have been developed that permit rocking vibration and uplift motion under appropriate control during major earthquake ground motions. These systems can lead to reduced seismic response.
    In this study, the seismic response of the controlled rocking building structures with yielding base plates is examined and evaluated. The results of this study are summarized as follows:
    1)The large-size column bases with yielding base plates were tested in static loading. The deformation characteristics and ultimate deformation capacity under cyclic behavior were quantitatively examined from the test results. The hysteretic model of yielding base plates was also studied and proposed.
    2)The three-dimensional seismic response of controlled rocking systems with columns allowed to uplift was evaluated and compared with that of fixed-base systems by finite element numerical analyses. The peak values of local strain near the column end of the base plate were compared with the statically loading test results and did not reach the ultimate strain values. It was also noted that the impact effect on columns at column landing was small from the examination of the peak local stress in columns at the first story.
    3)The three-dimensional seismic response of controlled rocking systems subjected to three-dimensional seismic motions was examined and evaluated by finite element numerical analyses. It was shown that the torsional behavior and the vertical components of seismic motions did not definitely affect the seismic performance of structures.
    4)The availability of several types of dampers with yielding base plates and the installation details at the column bases were investigated. The reparability of yielding base palates was also studied.

    researchmap

  • Basic Research on Vibration Control Building Structural System Including Uplift Mechanism

    Grant number:16560520  2004 - 2005

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

    AZUHATA Tatsuya, MIDORIKAWA Mitsumasa, WADA Akira, ISHIHARA Tadashi

      More details

    Grant amount:\3200000 ( Direct Cost: \3200000 )

    To reduce seismic damage of buildings, some structural systems which are intentionally allowed to uplift during an earthquake have been proposed. These systems can be generally applied to buildings with large aspect ratio, most of which has only single span. And these buildings will wholly uplift around the bearing on the one side. On the other hand, we propose ‘vibration control systems including uplift mechanism', assuming that seismic damage of buildings with multi-spans can be also reduced even if they are allowed to uplift partially, not wholly. In this research, we develop a method to make buildings uplift and examine seismic performance of the proposed structural systems.
    The achievements of this research are summarized as follows ;
    (1)Energy dissipation mechanism
    Seismic energy dissipation mechanism of buildings allowed to uplift wholly or partially were clarified.
    (2)Structural method to make buildings uplift
    A structural method to make buildings uplift using yielding base plates was proposed. The yielding base plates are attached at each column base. The restoring force characteristics of the base plates were cleared based on the large scale-tests.
    (3)FEM time history response analysis method
    Applicability of FEM time history response analysis method, which can analyze impact effects and non-linear behavior of base plates particularly, to buildings allowed to uplift was shown comparing analysis results with past experimental results.
    (4)Seismic response reduction effects of proposed structural systems
    Some case studies using a time history analysis method were carried out to verify seismic performance of the proposed systems. And their energy dissipation mechanism was shown.
    (5)Modal analysis on buildings allowed to uplift
    To understand seismic response characteristics of buildings allowed to uplift more generally, a modal analysis method was applied. Especially, effects of higher modes to dynamic behavior of them were shown.

    researchmap

▼display all

Teaching Experience

  • Disaster Mitigation for Building Structures

    2025.7 Institution:Institute of Science Tokyo

     More details

  • Tensor Analysis of Building Structures

    2023.12 Institution:Institute of Science Tokyo

     More details

  • Seismic Design for Nonstructural Components

    2023.4 Institution:Institute of Science Tokyo

     More details

  • Passive-control Structures and Base-isolated Structuresagainst Earthquakes

    2023.1 Institution:Institute of Science Tokyo

     More details