预应力混凝土管桩桩土相互作用的有限元分析

以软土地区某桥梁基桩动载试验为背景，采用有限单元法对桩土动力相互作用进行了分析。采用等效线性模型模拟了土体材料的非线性，并考虑桩的材料阻尼以及桩土接触界面处状态非线性对动力响应的影响，并分析了桩的材料参数和土的参数对桩顶动位移的影响。分析表明，基桩弹性模量和材料阻尼对桩顶动位移有一定的影响，但基桩材料阻尼的影响很小，桩顶位移随桩侧土压缩模量和阻尼的增大而减小。

Finite element analysis of interaction of pre stressed concrete pipe pile and soil

Based on the dynamic test of the pile in soft soil area, the interaction of pile and soil is analyzed by finite element method. Commonly used equivalent linear model is chosen to consider the nonlinerity of soil, material damping of pile is considered and the changing-status nonlinearity of soil-structure interface is considered by contact element. Parameters of pile and soil influenced on pile’s displacement were analyzed. The results show, there is some influences on pile top’s displacement as a result of a change of pile’s modulus of elasticity and material damping; and the pile’s displacement become smaller with the pile’s modulus of compressibility and material damping increasing.