在役钢筋混凝土T梁桥时变可靠度分析  

Time-dependent reliability analysis of the reinforced concrete T-beam bridge in service

作　　者：吕孟伟 LYU Mengwei(China Railway 16th Bureau Group Fourth Engineering Co.,Ltd.,Beijing 101400,China)

机构地区：[1]中铁十六局集团第四工程有限公司,北京101400

出　　处：《交通科技与经济》2019年第1期61-65,共5页Technology & Economy in Areas of Communications

摘　　要：在役期间的桥梁在荷载和环境侵蚀(如钢筋锈蚀)等因素的影响下,结构可靠度会随着在役时间的延长而降低。建立结构抗力时变概率模型和荷载效应概率模型,构建桥梁结构功能函数,基于Matlab分别采用一次二阶矩法、JC法和Monte Carlo法实现可靠度计算。以一座4×20m在役钢筋混凝土简支T梁桥为例进行时变可靠度分析,结果表明:该桥在服役15a后的结构可靠度大于规范目标可靠度要求,在服役70a左右的时候达到目标可靠度。Under the influence of load and environmental erosion(such as steel corrosion and carbonization),the reliability of the bridge structure decreases with the extension of service time.The time-varying probability model and the load effect probability model are established,and the function of the bridge structure is constructed.Based on Matlab,the first-order second-moment method,JC method and Monte Carlo method are used to calculate the reliability.A time-varying reliability analysis is performed using a 4×20 mreinforced concrete simple T-beam bridge as an example.The result shows that the structural reliability of the bridge after serving for 15 years is greater than the target reliability,and the target reliability is achieved when it is in service for about 70 years.

关 键 词：钢筋混凝土 简支T梁桥 时变模型 时变可靠度 MATLAB 

分 类 号：U448.34[建筑科学—桥梁与隧道工程]