服役RC梁桥CFRP板加固后的动态可靠度分析  

Dynamic Reliability Analysis of Serviceability State for RC Beam Bridges Strengthened with CFRP Sheet

作　　者：陈强[1] 

机构地区：[1]湖南城市学院土木工程学院,湖南益阳413000

出　　处：《重庆交通大学学报（自然科学版）》2016年第5期5-8,21,共5页Journal of Chongqing Jiaotong University(Natural Science)

基　　金：湖南省科技厅科技计划项目(2012GK3066)

摘　　要：建立起服役(RC)钢筋混凝土梁桥在(CFRP)碳纤维板加固前后正常使用状态下荷载效应的均值和标准差模型;采用模糊当量法将服役RC梁桥在正常使用极限状态的挠度当量转换为在一定区间内的均匀分布函数;在此基础上建立了服役RC梁桥在CFRP板加固后的正常使用极限状态方程。结合某座加固实体工程,采用JC验算点法计算了该桥在正常使用极限状态下,加固完成时及加固后的动态可靠度指标,得到了加固完成时可靠度指标的提高量及加固完成后可靠度指标的变化规律。研究发现:用CFRP板加固现有梁桥后,1号梁仍不能满足正常使用要求,2号梁在加固后服役30年后仍不能满足正常使用要求,说明目前采取碳纤维板加固桥梁在正常使用能力可靠性方面仍有所欠缺。The model simulating the mean and standard deviation of load effects for serviceability limit state of RC beam bridge strengthened by CFRP sheets were developed, and then the fuzzy equivalent method was used to convert deflection e- quivalent under serviceability limit state of bridge in service into equivalent uniform-distribution function in a certain range. On basis of this, the formulation for serviceability limit state of RC beam bridge strengthened with CFRP sheets was formula- ted. Combined with an actual bridge strengthened with CFRP, the JC checking point method was employed to calculate the dynamic reliability index of serviceability limit state at the completion of reinforcing works and in some time after such strengthening work done. The study findings show that after the bridge being reinforced with CFRP, #1 girder still fails to satisfy the required normal serviceability and #2 girder, and after being reinforced and serving over 30 years still fails to satisfy the required normal serviceability, both of which indicate the defect of the currently applied CFRP in respect of reliabili- ty of normal serviceability of bridge strengthened with CFRP.

关 键 词：桥梁工程 服役RC梁桥 CFRP板加固 模糊当量法 JC验算点法 动态可靠度 

分 类 号：U447[建筑科学—桥梁与隧道工程]