1998 Fiscal Year Final Research Report Summary
Collapse Behavior of Building Frames under Severe Earthquakes and Performance-based Seismic Design Method
| Project/Area Number |
09305037
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Building structures/materials
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| Research Institution | KYOTO UNIVERSITY |
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Principal Investigator |
UETANI Koji Kyoto University, Graduate School of Engineering, Professor, 工学研究科, 教授 (40026349)
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| Co-Investigator(Kenkyū-buntansha) |
TAGAWA Hiroshi Kyoto University, Graduate School of Engineering, Research Associate, 工学研究科, 助手 (70283629)
MASUI Takeshi Kansai University, Faculty of Engineering, Research Associates, 工学部, 助手 (60263109)
KOBAYASHI Masami Shiga Pref.University, Faculty of Environmental Science, Research Associates, 環境科学部, 助手 (50186772)
OHSAKI Makoto Kyoto University, Graduate School of Engineering, Assoc.Professor, 工学研究科, 助教授 (40176855)
TAKEWAKI Izuru Kyoto University, Graduate School of Engineering, Assoc.Professor, 工学研究科, 助教授 (20155055)
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| Project Period (FY) |
1997 – 1998
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| Keywords | Collapse Behavior / Performance-based Design / Limit-state Design / Seismic Resistant Design / Unstable Behavior |
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| Research Abstract |
The purpose of this project is to disclose collapse behaviors of building frames under severe earthquakes and to develop a new performance-based seismic-resistant design method. The following results have been obtained in this project.
1. It has been revealed that, when a building frame is subjected to severe earthquakes, deformation concentration could happen on lower few stones of a building frame. The conditions have been derived for suppression of such deformation concentration on lower few stories and for suppression of drifts. The validity of these conditions has been demonstrated through numerical response analysis.
2. Static and dynamic experiments on three-story one-span steel frame models have been conducted under constant vertical loads and repeated horizontal loads. A new prediction method of initiation of bow-shaped deformation and initiation of drift of the vibration center has been constructed. It has been confirmed that these predictions coincide well with the experimenta
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l results.
3. A new response analysis method has been developed which can simulate failure at beam ends and failure of hysteretic dampers. The effects of these failures on the seismic response of building frames have been disclosed via the newly developed numerical analysis program.
4. A new method has been developed for finding an unstable equilibrium path in the load-displacement relation in the case where a fracture develops in a structure consisting of elastic brittle members. An analysis method of fracture development in a building frame has been presented and its stability criterion has been derived.
5. A new performance-based seismic-resistant design method has been developed. The story stiffnesses of a shear building model have been designed so that the shear building model would exhibit a specified distribution of interstory drifts under design moderate earthquakes. The member size of the corresponding frame model has then been determined via reduced model-frame inverse transformation. Another design method under design major earthquakes has been proposed utilizing a newly developed equivalent linearization method. Less
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