| 建筑结构倒塌分析的单自由度模型 |
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| 引用本文： | 施炜,陆新征,叶列平,曲哲.建筑结构倒塌分析的单自由度模型[J].工程力学,2012,29(10):5-12. |
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| 作者姓名： | 施炜 陆新征 叶列平 曲哲 |
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| 作者单位： | 清华大学土木工程系, 清华大学结构工程与振动教育部重点实验室, 北京 100084 |
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| 基金项目： | 国家自然科学基金优秀青年基金项目(51222804);国家自然科学基金项目(51178249);教育部新世纪优秀人才支持计划项目(NCET-10-0528) |
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| 摘 要： | 该文建议了一种能够用于建筑结构倒塌分析的单自由度滞回模型。该模型能够模拟骨架线的强化和峰值点后的退化、滞回捏拢、往复荷载作用下的承载力和刚度退化以及P-Δ效应等。为验证所建议的单自由度滞回模型用于结构倒塌分析的有效性和合理性, 以一座8 层钢筋混凝土框架结构为例, 对原型结构和按照基本模态等效的单自由度模型分别进行了IDA 倒塌易损性分析, 结果表明两者的倒塌易损性曲线吻合较好。
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| 关 键 词： | 倒塌易损性分析 单自由度 滞回模型 承载力退化 P-Δ 效应 |
| 收稿时间： | 2011-11-15 |
SINGLE-DEGREE-OF-FREEDOM HYSTERETIC MODEL FOR COLLAPSE ANALYSIS OF BUILDING STRUCTURES |
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| Affiliation: | Department of Civil Engineering, Tsinghua University, Key Laboratory of Structural Engineering and Vibration of China Education Ministry, Beijing 100084, China |
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| Abstract: | A simplified single-degree-of-freedom (SDOF) hysteretic model for collapse analysis of building structures is proposed in this work. The simplified hysteretic model is capable of simulating strength deterioration under monotonic loading, pinching, strength and stiffness deterioration under cyclic loading as well as P-Δ effect, so that it can be applied to collapse analysis. To validate the applicability and effectiveness of the proposed SDOF hysteretic model, an eight-storey RC frame structure is simplified as an equivalent SDOF system according to its fundamental mode of free vibration and the collapse fragility analysis based on incremental dynamic analysis is implemented to the prototype structure and the simplified SDOF system, respectively. The results show that the collapse fragility curves of the prototype structure and the simplified SDOF system agree quite well with each other. |
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