考虑轴向横向荷载共同作用的基桩可靠度  

Reliability of pile foundation under vertical and lateral loads

作　　者：赵明华[1] 曾昭宇[1] 刘晓明[1] 苏永华[1] 

机构地区：[1]湖南大学岩土工程研究所,湖南长沙410082

出　　处：《建筑科学与工程学报》2005年第2期57-60,65,共5页Journal of Architecture and Civil Engineering

基　　金：国家自然科学基金项目(50378036)

摘　　要：结合确定性有限单元法与响应面法提出一种分析基桩可靠度的计算方法,并对基于桩顶水平位移过大和桩身材料屈服失效模式下倾斜荷载桩的可靠度进行了探讨,讨论了这两种破坏模式下影响基桩可靠度的多种因素,得到了若桩身施工质量控制水平较好,可按桩身材料屈服失效模式设计,若施工质量控制不理想,则宜按水平位移失效模式设计,以及倾斜荷载桩虽然存在P-△效应,但是和水平荷载影响相比,竖向荷载的变异性对基于桩顶水平位移过大和桩身材料屈服失效模式下基桩的可靠度影响不大等结论。Combining qualitive finite element method and response method, this paper presents a new reliability analysis method of pile foundation, then discusses the reliabilty of inclined-loading pile and factors that impacted on reliability based on the failure modes of excess top lateral displace and material yield. On the basis of these works, this paper concluded two important points： one is that design of pile should base on the mode of material yield under fair construction quality controling level or base on the mode of excess top lateral displace under poor construction quality controling level, the another is that variability of vertical loads and P-△ effect can be ignored compared with variability of lateral loads.

关 键 词：水平位移 材料屈服 倾斜荷载 基桩 有限单元法 响应面 可靠度 P-△ 效应 

分 类 号：TU473.1[建筑科学—结构工程]