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北京CBD文化设施工程位于北京市朝阳区,采用钢框架-支撑结构,设计难点主要为大跨度、大悬挑及楼板开大洞等。对于体型复杂、结构布置复杂的建筑结构,应采用至少两个不同的力学模型进行结构分析并进行对比。运用大型通用有限元软件ABAQUS建立了此建筑结构的三维模型,进行了结构的动力特性和模态分析,并采用振型分解反应谱分析方法,验算了各项指标,分析了结构在多遇地震作用下的结构响应,并将部分结果与MIDAS/Gen软件计算结果进行了对比。通过对计算结果的分析可以看出,通用有限元软件能够很好地对结构进行分析计算,结构的各项指标均满足要求;建议对局部刚度过小以及抗侧刚度突变的问题予以重视。
Beijing CBD cultural facilities project is located in Chaoyang District, Beijing, the use of steel frame - support structure, the design difficulties are mainly large-span, large cantilevered over the floor and open a large hole. For complex and complicated structures, at least two different mechanical models should be used for structural analysis and comparison. The three-dimensional model of the building structure was established by using the large-scale general finite element software ABAQUS. The dynamic characteristics and modal analysis of the structure were carried out. The modal decomposition response spectrum analysis method was used to check the various indexes. The structural responses were compared and some of the results were compared with those of the MIDAS / Gen software. Through the analysis of the calculation results, it can be seen that the general finite element software can analyze and calculate the structure well, and all the indexes of the structure meet the requirements. It is suggested to pay attention to the problem of too small local rigidity and the sudden change of the lateral stiffness.