复杂连体高层建筑结构抗震性能计算分析研究

Research on Seismic Performance of a Complex High-Rise Building with Connected Structure

复杂连体高层建筑作为一种新型结构形式,近年来发展迅速。它在满足特殊的功能需要、达到特定的外形效果的同时,由于连接体两端的塔楼在刚度上往往有较大差异,因而结构受力复杂、扭转效应明显,对于抗震性能也有较高的要求。上海国际设计中心就是这样一座平面和立面皆不规则的超限高层建筑。用ANSYS建立了上海国际设计中心的整体结构有限元计算模型,对其进行了线弹性阶段的模态分析、谱分析和动力时程分析,以及弹塑性阶段的推覆分析,并将所得各理论结果与模拟地震振动台试验结果进行了对比,以此考察结构的整体性能和薄弱部位,并评价其抗震性能。

Complex high-rise buildings with connected structures,as a new type of structures,have been developed fast in recent years.While meeting special functional needs and achieving particular shape effects,the stiffness difference between the two towers at the ends of the connected structure make this kind of structures behave great stress complexity and obvious torsion effect,thus have higher requirements for seismic capacity.Shanghai International Design Center is an exact example of out-of-codes high-rise buildings of such type,with irregularity in layout and in elevation.In this paper,a precise finite element model of the overall structure of SHIDC was built through ANSYS software.Based on the model,the seismic performance of SHIDC was evaluated by modal analysis,response spectrum analysis,elastic time-history analysis and plastic pushover analysis,then the calculation results were compared with the results of shaking table test,in order to evaluate its overall seismic behavior and possible weak parts,and finally a reasonable evaluation of its seismic performance was given.