2022 Fiscal Year Final Research Report
Complete collapse behavior and collapse factors of steel structural frames
Project/Area Number |
20K04790
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Research Category |
Grant-in-Aid for Scientific Research (C)
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Allocation Type | Multi-year Fund |
Section | 一般 |
Review Section |
Basic Section 23010:Building structures and materials-related
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Research Institution | Kyoto Institute of Technology |
Principal Investigator |
KANAO Iori 京都工芸繊維大学, デザイン・建築学系, 教授 (80372564)
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Project Period (FY) |
2020-04-01 – 2023-03-31
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Keywords | 応力-歪モデル / 局部座屈 / 劣化勾配 / 数値解析 / 線材モデル / 繰返し挙動 / 鋼材 |
Outline of Final Research Achievements |
The purpose of this study is to clarify the complete collapse behavior and deformation capacity of buildings in order to protect them from earthquakes. An analytical program that can trace the complete collapse of frames was developed to clrify the mechanisms. It was confirmed that the improved frame analysis program formulated by a stress-strain model with local buckling, can analyze the shaking table test of complete collaps frame. Furthermore, a complete collapse analysis of a one-story, one-span frame subjected to horizontal forces was conducted, and it was shown that the width-to-thickness ratio and axial force ratio of the columns have a large effect on the collapse behavior, but the effect of the beam-to-column strength ratio is small. It was also shown that a complete collapse may occur when the strength of the frame is reduced to half of the maximum strength.
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Free Research Field |
鋼構造 建築構造力学 数値解析
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Academic Significance and Societal Importance of the Research Achievements |
大地震による建物被害を抑え,事業継続性を高めるための研究である。鋼構造建物が完全倒壊に倒壊に至るメカニズムの解明を解明し,建物の完全倒壊を誘発する因子を特定することを目指している。倒壊要因の候補として,柱の厚み,建物重量,柱と梁の強度比とし,その影響を解析的に検討した。柱の厚み,建物重量は,倒壊につながる影響を与えるが,柱と梁の強度比の影響は小さいことを示した。また,建物の耐力が最大耐力の半分まで低下すると,完全倒壊に繋がる可能性が高いことを示した。これらのデータを蓄積すれば,倒壊を防ぎ,被害を少なくできる可能性がある。
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