复杂地下大空间综合体抗震性能分析

Analysis of the Seismic Performance in Large Underground Complex

在总结目前国内外地下结构抗震计算方法的基础上,采用动力时程分析方法对上海市临港新城复杂地下大空间综合体工程进行系统的抗震性能分析。建立了该复杂地下结构的三维精细化有限元分析模型,并基于混凝土极限拉应变假设理论,考虑混凝土材料弹塑性变化的力学行为,分别给出中震和大震作用下结构的基准地震响应,从而评价该复杂地下结构的抗震性能。分析结果表明:在中震作用下,结构受力仍处于弹性阶段;在大震作用下,结构能够满足弹塑性变形验算。

With a summary of the calculation method of underground structure seismic performance in the world, the large underground complex of Shanghai New Harbor City is analyzed by using dynamic time-history analysis method, and a 3D finite element analysis model is set up. Then, based on the hypothesis theory of ultimate concrete tensile strain, and considering the elastic-plastic deformation of concrete materials, the standard seismic responses in case of medium and big earthquakes are obtained. The result of the analysis shows, in case of a medium earthquake, the structural stress will remain in the elastic stage and could satisfy the checking calculation of elastic - plastic deformation even encountered with a gig earthquake.