| Project/Area Number |
17560514
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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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 | Tokyo Metropolitan University |
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Principal Investigator |
MINAMI Susumu Tokyo Metropolitan University, Faculty of Urban Environmental Sciences, Assistant, 都市環境科学研究科, 助教 (00219693)
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| Co-Investigator(Kenkyū-buntansha) |
YAMAZAKI Shinji Tokyo Metropolitan University, Faculty of Urban Environmental Sciences, Prof., 都市環境科学研究科, 教授 (30264592)
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| Project Period (FY) |
2005 – 2006
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| Project Status |
Completed (Fiscal Year 2006)
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| Budget Amount *help |
¥3,200,000 (Direct Cost: ¥3,200,000)
Fiscal Year 2006: ¥1,300,000 (Direct Cost: ¥1,300,000)
Fiscal Year 2005: ¥1,900,000 (Direct Cost: ¥1,900,000)
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| Keywords | Steel Frame / Progressive Collapse / Post-bucking Behavior / Steel Column / Load-Displacement Relation / Energy Absorption Capacity / Inelastic Collision / Dynamical Buckling Length / 衝突モデル / 崩壊条件 / 座屈後残存耐力 / 弾塑性応答解析 |
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| Research Abstract |
There are two cases of behavior of multistory frames after the vertical collapse of one story which occurs due to an event such as an explosion or an earthquake. One is where the collapse proceeds to a certain extent and then ceases and the other is where the collapse continuously progresses until all stories have completely collapsed. The collapse in the latter case is called progressive collapse which is an unstable phenomenon resulting from the gravity load of frames.
In this study, axial compression tests were carried out on box-section steel columns until complete collapse. The test parameters were the slenderness ratio and width-thickness ratio. The post-buckling behaviour of the steel columns for a large deformation range was clarified, and the load-axial deformation relationships were derived experimentally. Using these relationships, numerical analysis of the vertical dynamic response of multi-mass system models was performed to investigate the progressive collapse of steel buildings.
The study clarified the frame conditions which enable stories to resist progressive collapse through comparing the gravity potential energy released by the story collapse with the energy which columns absorb before they completely collapse due to the compressive load.
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