上海软土地震响应的振动台模型试验及其三维数值拟合分析

The Shaking Table Model Test of Seismic Response for Shanghai Soft Soil and Three Dimensional Mumerical Fitting Analysis

摘要:

对上海典型软土地铁车站结构振动台模型中的自由场振动台模型试验建立了三维计算模型,包括计算范围的确定,材料本构模型的选取,动力边界条件的选用以及地震波的输入等4个方面。用该模型对自由场振动台模型试验进行了三维的拟合分析,并将计算结果与实测结果以及二维拟合分析结果进行了比较分析,表明三者吻合较好。说明该计算模型可用来模拟模型土的动力特性,可为建立上海软土三维地震响应的计算方法提供基础。

Abstract:

Three-dimensional calculation model is established for the free-field shaking table model test, which is a part of the shaking table model test for typical subway station structure in soft soil in Shanghai. The model includes four aspects： the determination of calculation area, the choice of material constitutive models, the selection of dynamic boundary condition and the inputing of seismic wave. Three-dimensional fitting analysis on this model test by the calculation model is done. The results are compared with the test results and calculation results of 2-D model, and it shows a good coincide among three methods. The result indicates that the 3-D calculation model can be used to simulate the dynamic characteristic of model soil and provide a foundation to establish 3-D calculation method of seismic response for Shanghai soft soil.