CFRP布加固钢筋混凝土梁可靠性分析  

Reliability Analysis of Reinforced Concrete Beams Strengthened with CFRP Sheets

作　　者：高仲学[1] 杨威[2] 

机构地区：[1]东南大学建筑设计研究院,南京210018 [2]东南大学交通学院,南京210018

出　　处：《土木建筑与环境工程》2011年第6期36-43,共8页Journal of Civil,Architectural & Environment Engineering

基　　金：国家自然科学基金资助项目(51078079);住房和城乡建设部科技开发项目(2008-K4-16);江苏省科技交通项目(07Y015)

摘　　要：进行了CFRP布抗拉强度单向拉伸试验,对其概率分布进行了统计分析。试验结果表明,CFRP布的单向抗拉强度符合三参数Weibull分布。建立了CFRP布加固钢筋混凝土梁受弯承载力计算公式,应用Monte Carlo方法对CFRP加固钢筋混凝土梁的抗力进行了模拟。在得到抗力的统计参数以后,采用JC法对可靠指标进行了计算。计算结果表明,当CFRP布分项系数为1.25时,所有设计点的可靠指标在整体上与目标可靠指标最为接近,3种受弯破坏模式的可靠指标均值均大于目标可靠指标,满足可靠度设计的要求。The uniaxial load tests were conducted to investigate the material behavior of CFRP sheets.The results show that the probability distribution of CFRP tensile strength can be described by the three-parameter Weibull distribution.The design formulae for determining flexural capacity of reinforced concrete strengthened with CFRP sheet are proposed.The Monte Carlo procedure was applied to simulate the flexural capacity of reinforced concrete strengthened with CFRP sheet.By using the JC method,the reliability index was calculated based on the statistics of flexural capacity and load effect.After the analysis of the effect of the partial factor of CFRP sheet on the reliability index,the results reveal that the reliability index of all design points are the most close to target reliability index overall when the partial factor of CFRP sheet is 1.25,and in this condition the reliability index of three flexural failure modes achieve the target reliability index respectively.Therefore,the partial factor is suggested to be 1.25,which meets the requirement of reliability design.

关 键 词：CFRP布 材料性能 统计 材料分项系数 可靠指标 

分 类 号：TU375.1[建筑科学—结构工程]