建筑结构施工过程模拟的虚拟荷载法*
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(1同济大学建筑工程系，上海 200092；2同济大学建筑设计研究(集团)有限公司，上海 200092)
[摘要] 一次加载的结构内力与实际考虑施工顺序加载的结构内力不同。结构设计应考虑施工模拟的实际结构内力。虚拟荷载法提供一种可以采用一次加载法来考虑施工顺序加载的计算方法，是进行施工模拟的一种较简便分析方法，同时可以提供施工顺序加载工况与其他工况进行组合。但虚拟荷载法不能使所有结构内力都与施工模拟的结果相同，只能满足其中关键构件的某一种内力与施工模拟的结果相同。当只考虑结构抗震性能分析时，可只需影响抗震性能评估的关键内力准确即可。本文以两层框架为例，说明施工模拟虚拟荷载法的计算过程及其有效性。[关键词] 虚拟荷载法;施工模拟;框架结构中图分类号：TU721.5 文献标识码：A 文章编号：1002-848X(2013)S1-1004-04*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。A virtual load method for construction sequence simulation of building structuresDong Peiwei 1, Zhao Xin 2(1 Department of Building Engineering, Tongji University, Shanghai 200092, China; 2 Tongji Architectural Design (Group) Co., Ltd., Shanghai 200092, China)Abstract: The actual inter forces and deformations of a structure considering construction sequence are usually different from that of the entire structure under design gravity load. Construction sequence simulation should be considered in structural design. A virtual load method was proposed in this paper to simplify construction sequence analysis. With the virtual load method, the structural inter forces considering construction sequence can be obtained by loading at a time. Not all but part of the inter forces obtained with the virtual load method can be the same with that of construction sequence analysis. This would be valuable for seismic performance analysis, if part of the inter force is the end moment of frame components and axial force of vertical components. A case of two-story frame structure was studied in this paper to explain the calculation process and effectiveness of the virtual load method.Keywords: virtual load method, construction sequence simulation, frame structure
