【摘要】 将地基土-地铁车站结构体系视为平面应变问题,采用Davidenkov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-地铁车站非线性动力相互作用的有限元分析模型,分别研究了在中远场地震动和近断层地震动作用下地铁车站结构的塑性损伤行为,得出结构内部损伤场的分布,用损伤指数分别衡量结构局部和整体的损伤程度,并分析了在地铁结构非线性损伤演化规律。结果表明:地铁车站结构的损伤破坏区域主要是中柱的顶部和底部,不同楼层的中柱损伤破坏存在差异,局部和整体损伤指数时程变化规律一致,在变形累积效应下表现出非减特性。更多还原

【Abstract】 Considering the influence of soil-station structure interaction for 2D finite element analysis,the nonlinear dynamic interaction of soil-station structure is modeled.In the modeling,dynamic Davidenkov model is used to model dynamic characteristics of soils,and plastic-damage model is used to model dynamic characteristics of station structure concrete.Based on the reseach of plastic damage of station structure under middle-far field seismic action and near-fault seismic action,the damage zone of concrete structure is discovered,and then,the local and global damage degree of structrue is measured by damage index.Furthermore,the nonlinear damage evolution law of station structure is analysed.The result shows that the damage zone of station structure is the top and bottom of column,and damage situation is different between different floors.The law of local and global damage index is consistent essentially,and the damage index is increased with the efffet of accumulative deformation.更多还原