施工过程对结构抗震性能影响分析*
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(1 同济大学建筑设计研究(集团)有限公司，上海200092；2 同济大学建筑工程系，上海200092)[摘要] 结构初始状态会影响其在大震下的弹塑性反应。而施工过程会影响结构的初始状态，从而影响结构弹塑性反应。结构设计和抗震分析应基于考虑结构施工过程的实际状态。但现有的结构分析方法很难将抗震分析与施工模拟结合起来。本文采用虚拟荷载法模拟施工过程，从而使得动力弹塑性分析可以在考虑施工过程的结构上实现。本文以两层框架为例，采用虚拟荷载法求得较为理想的施工模拟等效荷载。采用El Centro NS 地震波对结构进行动力弹塑性分析，对比了考虑和不考虑施工过程的结构在该地震波下的弹塑性表现。结果表明，施工过程影响大震下的结构构件塑性发展，从而影响结构抗震性能。[关键词] 抗震性能;虚拟荷载法;施工过程中图分类号：TU315.9 文献标识码：A 文章编号：1002-848X(2013)S1-1008-04*上海市科技攻关计划资助（编号：09dz1207704）；上海市青年科技启明星计划（跟踪）资助（编号：11QH1402700）通讯作者：董佩伟，Email:463110106@qq.com。Influence of Construction Sequence on Structural Seismic PerformanceLiu Pei 1, Dong Peiwei 2 , Zhao Xin 1(1 Tongji Architectural Design (Group) Co., Ltd., Shanghai 200092, China; 2 Department of Building Engineering, Tongji University, Shanghai 200092, China)Abstract: The initial status of a structure may influence its elasto-plastic behavior under rear earthquake ground motions. Construction sequence can influence the structural initial status, thus making a discrepancy to the elasto-plastic analysis. Structural design and seismic analysis should be based on the actual structural status considering construction sequence. But it is hard to combine seismic analysis and construction sequence simulation using current structural analysis method. A virtual load method was used in this paper to simulate construction sequence, on the understanding of which the nonlinear dynamic analysis can be performed on actual structure considering construction sequence. A case of two-story frame structure was studied in this paper, and a good equivalent load for construction sequence simulation was obtained by virtual load method. And nonlinear dynamic analysis was performed, using El Centro NS earthquake ground motion as the seismic input. The different behaviors of the structures with and without virtual load were presented. The results have manifested that construction sequence influence the development of structural plasticity under rear earthquake ground motion, thus influencing structural seismic performance.Keywords: seismic performance, virtual load method, construction sequence
