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
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摘要
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。
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.
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.
引文
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[2]Huo H B,Antonio B.Seismic design of cut and coverrectangular tunnels-evaluation of observed behaviorof Dakai station during Kobe earthquake,1995[C]∥Proceedings of 1stWorld Forum of Chinese Scholarsin Geotechnical Engineering.Shanghai:[s.n.],2003.456-466.
[3]杨林德,杨超,季倩倩,等.地铁车站的振动台试验与地震响应的计算方法[J].同济大学学报,2003,31(10):1135-1140.Yang L D,Yang Ch,Ji Q Q,et al.Shaking table testand numerical calculation on subway stationstructures in soft soil[J].Journal of TongjiUniversity,2003,31(10):1135-1140.
[4]庄海洋,程绍革,陈国兴.阪神地震中大开地铁车站震害机制数值仿真分析[J].岩土力学,2008,29(1):245-250.Zhuang H Y,Cheng Sh G,Chen G X.Numericalsimulation and analysis of earthquake damages ofDakai metro station caused by Kobe Earthquake[J].Rock and Soil Mechanics,2008,29(1):245-250.
[5]左熹,陈国兴,王志华,等.软弱场地上地铁车站结构近远场地震反应特性振动台试验[J].土木工程学报,2010,43(增):299-305.Zuo X,Chen G X,Wang Zh H,et al.Shaking tabletest on the seismic response of subway stationstructure in soft sites under near and far field groundmotion[J].China Civil Engineering Journal,2010,43(S):299-305.
[6]庄海洋,陈国兴,朱定华.土体动力黏塑性记忆型嵌套面本构模型及其验证[J].岩土工程学报,2006,28(10):1267-1272.Zhuang H Y,Chen G X,Zhu D H.Dynamic visco-plastic memorial nested yield surface model of soiland its verification[J].Chinese Journal ofGeotechnical Engineering,2006,28(10):1267-1272.
[7]Lee J,Gregory L F.Plastic-damage model for cyclicloading of concrete structures[J].Journal ofEngineering Mechanics,1998,(4):892-900.
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