桥梁桩基竖向承载力可靠度分析  

Analysis for Reliability of Vertical Bearing Capability of Bridge Pile Foundations

作　　者：吴云果[1] 彭宣茂[1] 

机构地区：[1]河海大学力学与材料学院,南京210024

出　　处：《公路交通技术》2013年第2期53-56,60,共5页Technology of Highway and Transport

摘　　要：根据结构专业标准规范给出的单桩竖向承载力特征值公式,运用可靠度理论对钻孔灌注桩竖向承载力的可靠度进行分析。建立桩基承载力极限状态方程,运用VB语言并采用梯度优化法计算可靠度指标。对某桥某灌注桩竖向承载力进行可靠度指标计算,并利用影响单桩竖向承载力的各种随机变量及其变异系数对可靠度指标的影响进行分析。In accordance with eigenvalue formulae of vertical bearing capacity of single piles given in standard specifications of structural specialty, this paper applies the theory of reliability to analyze the reliability of vertical bearing capacity of cast-in-situ bored piles. The paper establishes the limit state equations and calculates reliability indices by means of VB language and gradient optimization method. The paper calculates the reliability indices of vertical bearing capacity of a east-in-situ bored pile of some bridge and analyzes the influences of various random variables and their coefficients of variation of vertical bearing capacity of single piles on the reliability indices.

关 键 词：桩基 梯度优化法 荷载效应 可靠度指标 随机变量系数 极限状态方程 

分 类 号：U443.15[建筑科学—桥梁与隧道工程]