基于综合刚度原理的陡坡基桩有限杆单元分析  

Finite Bar Element Analysis of Bridge Pile Foundation in Steep Slopes Based on Composite Stiffness Principle

作　　者：杨超炜[1] 赵明华[1] 尹平保[2] 刘猛[1] 

机构地区：[1]湖南大学岩土工程研究所,湖南长沙410082 [2]长沙理工大学土木与建筑学院,湖南长沙410114

出　　处：《地震工程学报》2015年第B07期46-51,共6页China Earthquake Engineering Journal

基　　金：国家自然科学基金资助项目(51278187;51408066)

摘　　要：为分析陡坡段桥梁基桩内力及变形特性,提出一种有限杆单元计算方法。首先,基于综合刚度原理并引入双参数地基模型,建立适用于陡坡基桩内力计算分析的修正有限杆单元刚度方程;在此基础上结合杆系结构受力特征,提出考虑P-Δ效应的杆单元修正矩阵;最后,根据有限杆单元计算原理,基于MATLAB平台编制计算程序,并对某工程实例进行分析。计算结果显示:改进有限杆单元方法可行且具有较高的精度;陡坡段桥梁基桩P-Δ效应显著,应在设计计算中予以考虑;在浅层地基土抗力计算中双参数地基模型较m法精度更高。A finite member element method is proposed for the analysis of the deformation of a bridge slope pile located on a steep slope. A modified finite member element method based on the composite stiffness principle and double-parameter ground model was established that was suit- able for the calculation, and analysis of the stresses on the slope pile. Next, taking into account the load response of the bar system, a modified matrix of the bar element incorporating the P-△ effect was developed. The next step involved writing a MATLAB program which was used to ana- lyze a real example. The results showed that the precise, proposed method was valid. Also, the P-△ effect was too considerable to be ignored in the design and calculation and double-parameter model works better than m-model on shallow ground.

关 键 词：桥梁工程 桩基础 有限杆单元法 综合刚度原理 P-Δ效应 

分 类 号：U443.15[建筑科学—桥梁与隧道工程]