基于P-Y曲线法的水平受荷桩非线性有限元分析

Nonlinear finite element analysis of piles under lateral load based on P-Y curves

P-Y曲线法是一种非线性地基反力法,它考虑了土的非线性特性、分层特性、不同土类及荷载类型等因素,适用于分析横向荷载作用下有较大变位的桩结构物。从Newmark方法弹簧支座的概念出发,建立了桩土相互作用体系的接触非线性有限元分析模型,采用复合地基反力法的P-Y曲线公式,推导了作用于桩上的非线性弹簧弹性系数的计算公式,基于marc有限元软件编制了相应的计算程序,基于一阶Taylor随机有限元的思想,给出了土性参数对泥面位移的敏感性计算公式,结合试桩资料的计算结果验证提出方法是合理可行的。

P-y curves method is one kind of nonlinear subgrade-reaction methods; it considers the nonlinear character, layer character, different kinds, and load kinds of ground soil. Starting from the concept of spring joint in Newmark method, the contact nonlinear finite element model is established for the pile-soil system. By the formula of P-Y curves of compound foundation reaction method, the formulas of elastic coefficients of nonlinear springs are deduced. The corresponding programs are organized based on Marc. Based on 1 st Taylor stochastic finite element concept, the sensitivities of the displacement on the soil level for soil parameters are computed. By comparing the data of testing pile, the numerical results indicate the rationality and the feasibility of the presented method.