【摘要】 利用FLAC3D对典型地铁车站结构振动台模型试验进行三维数值模拟,所建立的计算模型包括:(1)计算区范围与模型箱尺寸一致;(2)采用Davidenkov模型描述模型土的非线性变形特性,而结构模型采用弹性模型;(3)由于不考虑模型箱在振动过程中的变形,因此动力边界条件取为加速度边界;(4)地震荷载的输入与试验时地震波输入一致。计算结果包括模型土和车站结构的加速度响应规律、车站结构的动应变以及土–结构间的动土压力。计算结果与振动台试验结果吻合较好,说明采用的方法能较好地模拟模型土的动力特性,反映车站结构的动力响应及土与地铁车站结构间动力相互作用的规律。该研究工作能为建立典型软土地铁车站结构地震响应的三维计算方法提供基础。更多还原

【Abstract】 The shaking table test on typical metro station structure is simulated by FLAC3D. The calculation model includes the following four aspects. (1) The calculation area is identical with the model box. (2) The Davidenkov model is employed to simulate the dynamic nonlinear characteristics of model soil;and the structural model is regarded as in elastic state during test. (3) The dynamic boundary conditions are set as acceleration boundaries because the deformation of model box can be neglected. (4) The seismic loads accord with the waves used in the test. The test and calculation results include the rules of acceleration response of model soil and metro station structure model,the dynamic strain of metro station structure model and the dynamic soil pressure between model soil and structure model. The calculation results agree well with the test results,which shows the rationality of the proposed model. It can be used to simulate the dynamic characteristics of model soil,calculate the dynamic response of metro station structure and analyze the dynamic interaction between soil and structure. The study provides foundations to establish the 3D calculation method for metro station structure under seismic load in soft soil areas.更多还原