用ANSYS模拟结构-地基动力相互作用振动台试验的建模方法

Modeling of dynamic soil-structure interaction by ANSYS program

本文以结构一地基动力相互作用振动台模型试验为基础，结合通用有限元软件ＡＮＳＹＳ，对结构－地基动力相互作用体系进行有限元计算建模的一些问题作了研究，主要包括柔性土容器的模拟、土体动力本构模型的选用、上体与结构交界面上的状态非线性模拟、网格划分、重力的考虑、结构中钢筋的处理以及对称性的应用等．文中给出了利用上述建模方法对结构－地基动力相互作用体系进行计算的一些加速度时程结果，并与试验结果相对照，吻合较好．通过计算分析，验证了简化处理方法的合理性和计算模型的可行性．

Based on shaking table model test and using general - purpose finite element program ANSYS, some issues about modeling of Soil -Structure lnteraction(SSI) system are discussed in this paper. These issues mainly include simulation of flexible soil container, selection of dynamic constitutive model of soil, simulation of the changing - status nonlinearity of soil - structure interface, meshing, consideration of gravity, treatment of reinforcements in structure, using of symnietry principle and so on. As a result, some computational results of acceleration time -history of 551 system are given in this paper. Comparison between computer and test results shows that acceleration time -history curves of corresponding points are coincident approximately, and it is verified that the simulation methods in this paper are rational and the model is feasible.