地铁车站接头结构振动台模型试验及地震响应的三维数值模拟

先简要介绍了地铁车站接头结构振动台模型试验,然后利用有限差分软件FLAC3D对试验进行了三维数值拟合分析。建立的三维数值计算模型包括:计算范围与模型箱尺寸一致,采用Davidenkov模型描述模型土的非线性动力特性,对边界条件采用加速度条件模拟。计算得到了车站结构模型和区间隧道模型的加速度响应、土–结构间的动土压力值以及结构模型的动应变值。计算结果与实测结果吻合较好,验证了建立的数值计算模型是合理的,拟合分析结果是正确的,从而可为建立软土地铁车站结构地震响应的三维计算方法提供基础。

Shaking table tests on subway station joint structure and 3D numerical simulation of seismic response

The shaking table tests on subway station joint structure model were introduced and simulated by FDM software FLAC3D.The calculation range of model was consist with the model box.Davidenkov model was employed to simulate the dynamic nonlinear characteristics,and the constant acceleration boundary condition was used.The rule of acceleration response of modelled soil and structure,the dynamic strain of structure and the dynamic soil pressure between soil and structure were obtained.The calculated results agreed well with the test results,showing that the simulation was correct,and it could be used to establish the 3D calculation method for subway station structure under seismic load.