采用MARC模拟支盘桩-地基-结构动力相互作用体系建模方法

文章以结构-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MARC,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。主要包括柔性容器的模拟、网格的划分、对称性的利用、重力的考虑、土体本构模型的选用及模型的非线性模拟等。文章利用上述建模方法,对结构-地基动力相互作用体系的振型曲线和加速度时程曲线进行计算,将模拟结果与试验结果相对照,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。

Modeling of the squeezed branch pile-soil-structure dynamic interaction system by the MARC program

Based on the shaking table model test and the general-purpose finite element program MARC,some issues about modeling of the soil-structure interaction(SSI) system are discussed,which mainly include simulation of the flexible soil container,meshing,using of the symmetry principle,consideration of gravity,selection of constitutive models of soil,and simulation of model nonlinearity of geometry.By using the presented modeling methods,the acceleration-time history curves of the SSI system and the shaking model curves are obtained,and they are compared with the test results,which shows good coincidence.Thus the simulation methods in this paper are proved to be rational and the calculation model is proved to be feasible.