倾斜荷载下基桩P-Δ效应等效剪力有限元迭代法研究  

Equivalent-shear Finite Element-iterative Method of P-Δ Effect of Pile under Inclined Loads

作　　者：李微哲 

机构地区：[1]中煤科工集团重庆设计研究院,重庆400016

出　　处：《华东交通大学学报》2012年第3期31-35,共5页Journal of East China Jiaotong University

摘　　要：假定桩身位移为三次幂函数,结合倾斜偏心荷载下单桩受力微分方程确定的桩身弯矩、剪力与桩身水平位移关系,在此基础上引入等效剪力增量概念,提出了基桩P-Δ效应的等效剪力有限元迭代法,相应编制了Matlab分析程序,并结合算例对成层地基中倾斜偏心荷载、桩自重、水平分布荷载、竖向分布荷载和竖向荷载综合作用下基桩内力位移进行了分析。结果表明:等效剪力有限元迭代法用于倾斜荷载下基桩P-Δ效应计算分析是有效的;当墩身较高时,墩身倾斜、墩顶偏心弯矩、水平力等对基桩产生的P-Δ效应显著。It is assumed that horizontal displacement of pile has a longitudinally cubic power function, and equivalent-shear finite element-iterative method which can analyze the P-△ effect of piles under inclined and eccentric loads, is derived in the paper. And Matlab process of equivalent-shear fmite element-iterative method is edited. Case analysis is done in the paper for displacement and stress calculation of pile under inclined and ec- centric loads, moment, pile gravity, horizontal distributed loads, vertical distributed loads, scattering vertical forces and soil-pile friction. Finally conclusions are drawn as follows： equivalent-shear finite element-iterative method is proved to be an effective method for P-A effect analysis of piles under complex loads; P-A effect is notable while piers are high.

关 键 词：桩基础 倾斜荷载 等效剪力有限元迭代法 P-Δ效应 

分 类 号：U442[建筑科学—桥梁与隧道工程]