倾斜受压荷载作用下斜桩受力特性的数值分析  

Numerical Analysis on Mechanical Property of Battered Piles under Inclined Load

作　　者：张麒蛰[1] 卓卫东[1] 

机构地区：[1]福州大学土木工程学院,福建福州350108

出　　处：《公路交通科技》2013年第8期57-61,共5页Journal of Highway and Transportation Research and Development

基　　金：国家自然科学基金项目(41272299)

摘　　要：为揭示倾斜受压荷载作用下斜桩的受力特性,基于非关联流动Mohr-Coulomb准则的弹塑性本构关系,建立三维弹塑性有限元模型,分析了倾斜荷载作用下荷载倾角和桩身倾角对斜桩受力特性的影响。结果表明:当荷载倾角较小时,倾斜荷载作用下的斜桩刚度同时取决于轴向与水平向刚度,二者刚度存在一个平衡,导致斜桩刚度并非在轴向受力时达到最大;斜桩极限抗压承载力随着荷载倾斜角度呈现M型,桩身极限抗压承载力峰值并非出现在轴向受力时,而出现在荷载倾斜小角度附近;正向倾斜荷载作用下,桩的刚度和承载力均随桩身倾角的增大而增大,在负向倾斜荷载作用下,其结果却相反;不同倾角斜桩的极限荷载受桩—土摩擦系数影响较大。In order to reveal the mechanical property of battered piles under inclined load, based on the elastic-plastic constitutive relation of non-associated flow Mohr-Coulomb criterion, a 3D elastic-plastic finite element model is built to analyze the influence of inclined angles of load and pile on the mechanical property of battered pile under the inclined load. The result indicates that （1） the stiffness of battered pile depends on both the axial and horizontal stiffnesses under a smaller inclined load, and the stiffness of battered pile does not develop the maximum under the axial force due to the existing stiffness balance in the axial and horizontal direction; （2） the relation between the ultimate compressive bearing capacity of battered pile and the angle of inclination presents a ＇M＇ shape, the peak of ultimate pile compressive bearing capacity appears near a small load angle of inclination instead of under axial force; （3） Stiffness and bearing capacity of the battered pile increase as pile inclination under positive inclined load, while the result shows the opposite under negative inclined load; （4） The ultimate loads of battered pile with different inclination are significantly affected by the coefficient of friction between pile and soil.

关 键 词：桥梁工程 受力特性 数值模拟 斜桩 倾斜荷载 

分 类 号：U441.2[建筑科学—桥梁与隧道工程]