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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。
The structural internal force loaded at one time is different from the structural internal force loaded actually by the construction sequence. Structural design should consider the actual structure of the construction simulation of internal forces. The virtual load method provides a calculation method that can take a load method to consider the construction sequence loading. It is a relatively simple analysis method for construction simulation, and at the same time, it can provide combination of loading sequence and other conditions in the construction sequence. However, the virtual load method can not make all the structural internal forces the same as the results of the construction simulation, and can only satisfy one of the internal forces of the key components which is the same as the result of the construction simulation. When only considering the seismic performance analysis of the structure, the key internal forces that can only be evaluated for the seismic performance can be accurately estimated. In this paper, a two-tier framework is taken as an example to illustrate the calculation process and its effectiveness of construction simulation virtual load method.