海洋大气环境下钢筋混凝土梁受弯时变可靠度分析  

Time-dependent reliability analysis of reinforced concrete beams subjected to bending and marine atmospheric environment

作　　者：周彬彬[1] 顾祥林[1] 张伟平[1] 金贤玉[2] 黄庆华[1] 

机构地区：[1]同济大学,上海200092 [2]浙江大学,浙江杭州310027

出　　处：《土木工程学报》2010年第S2期15-21,共7页China Civil Engineering Journal

基　　金：国家重点基础研究发展计划(973计划)项目(2009CB623200)

摘　　要：通过引入应力水平影响系数,建立考虑荷载影响的钢筋锈蚀速率时变模型。采用随机分析方法研究锈坑空间分布变异性对锈蚀钢筋混凝土梁可靠度的影响。通过把梁离散为许多小尺寸单元,将整个构件的失效概率转化为一系列单元的串联体系失效概率,采用蒙特卡罗法计算海洋大气环境下钢筋混凝土梁受弯时变可靠度。计算结果表明:对锈蚀钢筋混凝土梁进行时变可靠度分析时,考虑锈坑的空间变异性及荷载对结构劣化的影响十分必要。A time-dependent model of corrosion rate of steel rebars was established by introducing influential coefficients of stress level to chloride diffusion model with consideration of the influence of load.A stochastic analysis was conducted using the model to assess the influence of spatial variability of pitting corrosion on the reliability of corroded reinforced concrete beams,in which the beam was discretized into a series of small elements and the probability of failure of the beam was evaluated as the union of the element failures.Monte Carlo simulation was conducted to evaluate the time-dependent reliability of a reinforced concrete beam subjected to bending and marine atmospheric environment.The results show the importance of considering spatial variability of pitting corrosion and the influence of load on the deterioration in a time-dependent reliability analysis for corroded reinforced concrete beams.

关 键 词：坑蚀 时变可靠度 空间变异性 锈蚀钢筋混凝土梁 

分 类 号：TU375.1[建筑科学—结构工程]