2003 Fiscal Year Final Research Report Summary
Ultimate Earthquake Resistant Capacity of CFT-Frame Based on Dynamic Collapse Behavior
| Project/Area Number |
14550573
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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 | Kumamoto University |
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Principal Investigator |
SAISHO Motoo Kumamoto University, Faculty of Engineering, Professor, 工学部, 教授 (40040448)
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| Project Period (FY) |
2002 – 2003
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| Keywords | Earthquake resistant capacity / Concrete filled steel tube / Seismic response / Restoring force characteristics / Crack / Local buckling / Collapse of frame / Damage factor |
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| Research Abstract |
The seismic response and damage of many concrete filled steel tube frames (CFT frames) under strong ground motion have been analyzed numerically and it is pointed out that the ultimate earthquake resistant capacity of CFT frame, which is decided on the basis of the dynamic collapse of CFT frame, is strongly effected not only by the story-shear strength distribution and the column-over-design factor but also by the filled concrete-to-steel tube strength ratio.
To predict the ultimate earthquake resistant capacity of CFT frame and the effects of these design factors on it, a simple design formula is derived from the calculated seismic responses of CFT frame. It is ascertained that the formula is simple but it can approximate well the damage ratio of CFT frame that is corresponding to the ultimate earthquake resistant capacity of it.
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