基于土与高层建筑群相互作用振动台试验的土体动力非线性模拟

Simulation of soil dynamic nonlinearity based on shaking table test of soil highrise building groups interaction

在动力荷载作用下,土与建筑群的动力相互作用中,土体表现出明显的动力非线性。同时振动台实测值与计算值对比分析中,土体的模拟至关重要。本文基于土与高层建筑群动力相互作用的振动台试验实测数据,应用Davidenkov地基模型实现土体动力非线性模拟。首先由土体的实测材料值拟合出Davidenkov地基模型内的相应参数值,然后用ANSYS编制计算程序,建立土与高层建筑群动力相互作用振动台试验的有限元模型,最后将计算值与试验值进行对比分析,验证Davidenkov地基模型用于此振动台试验的准确性。

The soil mass shows an obvious dynamic nonlinearity under the earthquake excitation in the system of soil highrise buildings dynamic interaction. The simulation of soil dynamic nonlinearity is very important when the measured data of shaking table test are contrasted with the calculation value. Based on the measured data of sha- king table test of soil highrise buildings dynamic interaction, Davidenkov constitutive model was applied to realize the simulation of soil dynamic nonlinearity in this paper. First, the parameter values in the Davidenkov model were fitted according to the soil material measurements of the shaking table test. The finite element model of the shaking table test was then established by programming with the commercial finite element package ANSYS. Finally com- parison of the finite element result with the experimental value was carried out to verify the accuracy of applying the Davidenkov constitutive model to the shaking table test.