桥梁结构时变可靠度计算的新方法  

NEW METHOD FOR CALCULATION OF TIME-DEPENDENT RELIABILITY OF RC BRIDGES

作　　者：叶新一 王草 李全旺[1] YE Xin-yi1;WANG Cao;LI Quan-wang(Department of Civil Engineering,Tsinghua University,Beijing 100084,China;School of Civil Engineering,The University of Sydney,Sydney NSW 2006,Australia)

机构地区：[1]清华大学土木工程系,北京100084 [2]悉尼大学土木工程学院

出　　处：《工程力学》2018年第11期86-91,共6页Engineering Mechanics

基　　金：国家自然科学基金项目(51778337)

摘　　要：为提高桥梁结构时变可靠度的计算效率,该文提出了新的计算方法。该方法基于结构时变可靠度分析的基本理论,利用Taylor级数展开,将可靠度计算从传统的积分运算形式转换为代数运算的形式,从而简化计算过程,提高计算效率。为了考虑桥梁初始承载力和衰减过程的不确定性,该文基于全概率方法,给出了计算劣化结构时变可靠度的显式公式。通过将该文方法应用于某钢筋混凝土桥梁进行时变可靠度分析,并与MonteCarlo模拟方法进行对比,表明了该文方法的准确性和高效性。A new method was proposed to improve the calculation efficiency of time-dependent reliability analysis for bridges.Based on the basic theory of structural reliability,the proposed method utilizes the Taylor expansion to simplify the traditional formula in an integration expression as a new formula in an algebraic expression,which essentially improves the calculation efficiency.In order to consider the uncertainties associated with the initial resistance and the degradation process,an explicit formula for time-dependent reliability analysis was also presented using a total probabilistic theorem.The proposed method was applied to the time-dependent reliability analysis of an RC bridge,and the results were compared with that associated with Monte Carlo simulation method to demonstrate the accuracy and high efficiency of the new method.

关 键 词：桥梁工程 新方法 TAYLOR展开 时变可靠度 劣化桥梁 

分 类 号：U441.4[建筑科学—桥梁与隧道工程]