基于WIEGHARDT地基的桩弹性分析  

ANALYSIS OF PILES ON A WIEGHARDT-TYPE ELASTIC FOUNDATION

作　　者：张永兴[1] 陈林[1] 

机构地区：[1]重庆大学土木工程学院,重庆400045

出　　处：《工程力学》2010年第A02期221-225,共5页Engineering Mechanics

基　　金：国家自然科学基金项目(50878218);国家杰出青年科学基金项目(50625824)

摘　　要：基于梁挠曲线微分方程,考虑剪力对桩变形的影响,利用梁单元间变形、转角、弯矩和剪力协调条件,桩整体平衡条件,给出了Wieghardt地基模型下桩变形计算方法。根据与桩变形之间的导数关系,进一步得到桩的转角、弯矩和剪力表达式。算例分析表明,计算结果与有限元方法计算结果基本吻合,Wieghardt地基模型性能优于传统Winkler地基模型,考虑侧向连续性的Wieghardt地基模型能较好地模拟桩周土体对桩支承、约束及水平位移的影响。It is assumed that the differential equation of the deflection curve is valid for piles on elastic foundation;the effect of shear on the deflection curve of the pile has been taken into account in the equation.Based on the equation,the deformation of piles on Wieghardt foundation was deduced considering the compatibility of deflection,angular rotation,moment and shear of adjacent pile elements.The equations for angular rotation,moment and shear of the piles could also be obtained from their differential relationships with deflection.The example shows that the results obtained by the proposed method were consistent with those by the finite element method;the Wieghardt foundation model is superior to the traditional Winkler foundation model;and the Wieghardt foundation model preferably simulates the influence of surroundding soil on pile bearing,restraint and horizontal displacement.

关 键 词：Wieghardt地基梁 剪力 桩顶约束函数 桩底约束函数 基床系数 

分 类 号：TU432[建筑科学—岩土工程] TU473.1[建筑科学—土工工程]