基于EAS单元的薄壁筒桩与土相互作用的有限元分析方法

用三维等参EAS单元描述混凝土薄壁筒桩的受力变形特性,用薄层接触面单元模拟桩与土体之间的相互作用,建立了由接触面约束内力和桩上作用荷载求解桩体内力的静力平衡方程,提出了考虑桩土相互作用的桩体有限元内力分析方法.对某工程薄壁筒桩在水平荷载作用下的桩体变形和内力进行了分析,并将分析结果与现场试验结果进行比较,验证了本文分析方法的正确性.

EAS element-based FEM analysis of interaction between thin-walled cylindrical piles and soil

With the three-dimensional isoparametric EAS elements to describe the stress and deformation characteristics of thin-walled concrete cylindrical piles and interface elements to describe the interaction between thin-walled cylindrical piles and soil, static equilibrium equations for calculating stress of pile bodies according to restraint stress of contact surfaces and loads on piles were established, and a finite element method for the stress analysis of piles considering the interaction between piles and soil was presented. With this method, deformation and stress of thin-walled cylindrical piles in some projects under horizontal loads were analyzed. The comparison of the calculated results with those of in-situ test verifies the practicability of the present method.