软弱场地地铁车站结构地震反应的数值模拟与模型试验对比分析

根据软弱场地土上地铁车站结构大型振动台模型试验结果,以软件ABAQU S为平台,采用记忆型嵌套面黏塑性动力本构模型和动塑性损伤模型,分别模拟土体和车站结构混凝土的动力特性,建立了土-地铁车站结构非线性动力相互作用二维和三维有限元分析模型,对各种试验工况下地基土-地铁车站结构体系的地震反应进行了数值模拟,并与试验结果进行了对比。结果表明:二维、三维数值模拟与振动台模型试验结果基本一致,三维模型可更好地模拟软弱场地与地铁车站结构的动力相互作用及模型结构的动力反应。数值模拟结果和振动台试验结果可相互验证其可靠性。

Comparative Analysis between Numerical Simulation and Model Test on the Seismic Response of Subway Station Structure in Soft Clay

Based on the results of the large-scale shaking table test of subway station structures in soft clay,finite element software ABAQUS was used to establish two-and three-dimensional nonlinear dynamic interaction model for soil-subway station structure system.In the modeling,dynamic visco-plastic memorial nested yield surface model was used to describe the dynamic characteristics of soils,and dynamic plastic-damage model was used to simulate the dynamic characteristics of tunnel concrete.The seismic response of soil-subway station structure system under different test conditions was analyzed by the numerical simulation method.Moreover,the numerical simulation results and the shaking table test were compared in detail.The results show that the simulation results of the two-and three-dimensional model are basically identical with the shaking table tests.The three-dimensional model is better to simulate the dynamic interaction of the subway station structure and the soil as well as the dynamic responses of the station structure in soft clay.The modeling analysis based on software ABAQUS and the shaking table test results are mutually verified.