倾斜荷载下群桩承载特性理论分析  

Theoretical analysis of bearing capacities of pile group under oblique load

作　　者：周立朵 孔纲强[1,2] 彭怀风 顾红伟[3] 朱希[2] 

机构地区：[1]河海大学岩土力学与堤坝工程教育部重点实验室,江苏南京210098 [2]河海大学土木与交通学院,江苏南京210098 [3]江苏省交通规划设计院股份有限公司,江苏南京210014

出　　处：《岩土力学》2017年第9期2647-2654,共8页Rock and Soil Mechanics

基　　金：国家自然科学基金资助(No.51278170;No.51478165)~~

摘　　要：倾斜荷载是海洋、输变线塔等桩基工程的最主要荷载形式之一。然而现行规范中有关该问题的计算方法相对并不成熟。将桩身划分为自由段和嵌固段,建立桩基单元体的挠曲微分方程;基于群桩p-y曲线法计算水平荷载下群桩承载特性;考虑桩-土相对滑移和竖向力引起的二阶弯矩(P-(35))效应,基于剪切位移法计算竖向荷载下桩-土相互作用;编制相应程序,以迭代法计算获得荷载-位移曲线、桩身弯矩分布规律曲线等。分析验证了所建立的理论计算方法的准确性和可靠性。相关研究成果拓展了工程设计中倾斜荷载作用下桩基承载特性计算方法,为工程设计与计算提供参考依据。Oblique load is one of the most important loading forms of pile foundation in applications such as offshore,transmission line tower engineering,etc.However,the current calculation method for this problem is relative immature.Piles were divided as free section and embedded section.The deformation for modeling representative element of pile was developed.The pile-soil interaction under lateral load was considered through group pile p-y curves method.The pile-soil interaction under vertical load was considered by using shear displacement method with the consideration of soil-pile relative slip and second order bending moment caused by vertical force（P-（35）） effect.The load-displacement relationship and bending moment distribution can be obtained by iterative method.The accuracy and reliability of the theoretical calculation established in this paper were verified through comparing with previous results.The results expand the theoretical calculation method of pile foundation under oblique load,and provide a reference for related engineering design and calculation.

关 键 词：桩基 倾斜荷载 P-Y曲线 剪切位移法 理论分析 

分 类 号：TU473[建筑科学—结构工程]