既有钢筋混凝土梁时变可靠度计算模型  

Calculating models of time-dependent reliability for existing reinforced concrete beam

作　　者：郑怡[1,2,3] 刘明[2,3] 沈小俊[4] 张延年[2] 

机构地区：[1]重庆交通大学结构工程重点实验室,重庆400074 [2]沈阳建筑大学土木工程学院,辽宁沈阳110168 [3]大连理工大学海岸和近海工程国家重点实验室,辽宁大连116024 [4]重庆市公路工程质量检测中心,重庆400060

出　　处：《交通运输工程学报》2009年第2期45-49,共5页Journal of Traffic and Transportation Engineering

基　　金：重庆交通大学结构工程重点实验室2007开放基金项目(CQSLBF-Y07-4);沈阳建筑大学结构工程省级重点实验室2007年度开放基金项目(JG200705);"十一五"国家科技支撑计划项目(2006BAJ03A01-05)

摘　　要：分析了目前既有结构时变可靠度计算理论和现行规范计算公式,考虑混凝土损伤和钢筋锈蚀以及材料强度随时间劣化的情况,建立了既有钢筋混凝土梁(单筋矩形截面、双筋矩形截面和T形截面)的时变抗力计算模型,给出了既有钢筋混凝土梁的时变可靠度指标,并通过工程实例对既有钢筋混凝土梁进行了加固前计算分析。结果表明:实例结构动态可靠度指标为1.56,承载能力属于d级,这与现行可靠性鉴定标准的评级相吻合,因此,计算模型合理可靠。The current theory of time-dependent reliability for existing structures and the calculating formula in current standard were analyzed. Considering the condition of material strength deterioration with time and the damages of concrete and steel, time-dependent strength calculating models were built for single-side reinforced concrete beam with rectangular section, double reinforced concrete beams with rectangular section and T-shape section. The time-dependent reliability index was put forward, and an engineering example was studied. Analysis result shows that the reliability index of existing reinforced concrete beam is 1.56, its bearing capacity belongs to grade d and is fit with current reliability appraisal standard, so the calculating models are correct and reasonable.1 tab, 2 figs, 14 refs.

关 键 词：桥梁工程 既有钢筋混凝土梁 时变可靠度 可靠性鉴定 抗力退化 

分 类 号：U441[建筑科学—桥梁与隧道工程]