隔层桁架式立体停车结构地震倒塌易损性分析  

Seismic Collapse Fragility Analysis of the 3D Parking Structure with Alternation Story-height Truss Lateral-load-resisting System

作　　者：贺拥军[1] 周绪红[1,2] 何佳琦[1] 

机构地区：[1]湖南大学土木工程学院,湖南长沙410082 [2]重庆大学土木工程学院,重庆400044

出　　处：《湖南大学学报（自然科学版）》2014年第4期10-15,共6页Journal of Hunan University:Natural Sciences

基　　金：国家自然科学基金资助项目(51178176);湖南省自然科学基金资助项目(13JJ6022);教育部博士学科点专项科研基金资助项目(20120161110019)

摘　　要：采用基于增量动力分析的易损性分析方法定量地评估了隔层桁架式立体停车结构的抗地震倒塌能力.分析了结构在地震作用下的倒塌过程、倒塌机理,对结构在单向和双向地震作用下的抗地震倒塌能力进行了对比,并比较了不同层数结构的抗倒塌能力及安全储备系数.结果表明,该类型结构具有良好的抗地震倒塌性能,底层是结构抗倒塌薄弱层;随结构层数的增加倒塌概率增大、抗震能力减弱,但抗倒塌安全储备系数并不是随结构层数的增加而不断减小.建议针对该类型立体停车结构的设计可以考虑突破现行建筑结构规范高宽比的限值.The seismic collapse-resistant capacity of the three-dimensional （3D） parking structure with alternation story-height truss lateral-load-resisting system was evaluated by IDA-based seismic fragility analysis method. The structural collapse process and mechanism under earthquake were analyzed. The seismic collapse-resistant capacities of the structure under one-directional and bi-directional earthquakes were compared. And the comparison of the seismic collapse-resistant capacities and collapse margin ratios of the structures with different floors was carried out. The result has shown that the seismic collapse-re- sistant performance of this kind of 3D parking structure is very good, and the first storey is the weak sto- rey. The collapse probability increases with the increase of the storey count of the structure, and then the seismic performance becomes weak. However, the collapse margin ratio of the structure does not always decrease with the increase of the storey count of the structure. It is recommended that the provision of theheight-width ratio in the current design code of building structure can be broken in the design of this kind of 3D parking structure.

关 键 词：地震响应 隔层桁架式立体停车结构 地震易损性 抗地震倒塌能力 抗倒塌安全储备系数 

分 类 号：TU248.3[建筑科学—建筑设计及理论]