用纤维模型对地下结构地震破坏的数值模拟分析
Numerical Simulation Analysis on Earthquake Damage of Underground Structure with Fiber Model
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摘要: 以1995年日本神户地震时遭受破坏的大开地铁车站为研究对象,按照车站的结构尺寸和周围土层的参数,建立了土-结构二维平面应变有限元分析模型,并对地铁车站结构的薄弱部位,采用了考虑钢筋和混凝土材料非线性的纤维单元模型.利用土体地震时等效阻尼比和等效剪切模量来考虑土体的动力非线性,以神户地震Port岛地下83m处记录到的南北向和铅直向加速度波形作为二维地震动的输入波,模拟了大开车站地震时的动力反应和破坏过程,研究该站的地震破坏机理,分析了中柱、上壁和侧壁的破坏类型.Abstract: The soil-structure finite element model of DAIKAI subway station damaged in 1995 kobe earthquake was built by two dimensional plane strain element, in full accordance with the actual structure size and ground information of DAIKAI subway station.Both dynamical response and damage process of DAIKAI subway station were simulated based on XN and UD acceteration time histories recorded at 83 m underground in port istand in kobe earthquake, while dynamical non-linearity was considered by both equivalent damp and equivalent shear modulus of soil inthe earthquake.The damage mechanism of DAIKAI subway station in the earthquake was studied.The damage types of middle column, side wall and roof were analyzed.