倾斜荷载作用下高桩的非线性数值分析  

Nonlinear numerical analysis of high pile under inclined loads

作　　者：易教珠 姚文娟[2] 吴怀睿[2] 程泽坤 

机构地区：[1]江西省交通设计院,江西南昌330002 [2]上海大学土木工程系,上海200072 [3]中交第三航务工程勘察设计院有限公司,上海200032

出　　处：《水运工程》2011年第7期61-65,共5页Port & Waterway Engineering

摘　　要：现有的桩基设计计算较少考虑倾斜荷载耦合作用的影响,因而不能精确反映高桩桩身实际的工作情况。从Newmark弹簧支座的概念出发,结合p-y曲线法,提出了适用于有限杆单元法的非线性弹簧系数矩阵求解方法,并在此基础上考虑P-Δ效应,编制了相应的有限元程序。通过对工程实例的计算和比较,对模型的正确性和可行性进行了验证。同时,利用该方法计算分析了桩顶转角和P-Δ效应的影响程度。Current pile design methods lack special treatment on the coupling of inclined loads,so the actual conditions of high-piles can＇t be reflected accurately.A method for calculating the coefficient matrix of lateral nonlinear springs,which is very applicable in finite pole element analysis,is proposed based on the concept of Newmark spring and the p-y curves formula.Then,The finite element program,which considers the P-Δ effect,is compiled on the basis of the analysis model,and applied to analyze real projects.The correctness and feasibility of the presented model is confirmed by comparing the results of this study with testing piles.Moreover,the influence degree of the rotation on the pile top and P-Δ effect is analyzed.

关 键 词：倾斜荷载 P-Y曲线 有限杆单元法 水平非线性弹簧系数矩阵 P-Δ效应 

分 类 号：TU473.1[建筑科学—结构工程]