基于可靠度分析的既有钢筋混凝土桥梁性能评估  

Assessment of Performance of Existing RC Bridges Based on Reliability Analysis

作　　者：卢照辉 王璐璐[2] 叶文亚 彭卫[2] 

机构地区：[1]宁波市公路管理局,浙江宁波315040 [2]浙江大学宁波理工学院,浙江宁波315100

出　　处：《公路交通科技》2014年第6期80-85,共6页Journal of Highway and Transportation Research and Development

基　　金：宁波市交通委科技计划项目(201109);浙江省交通厅科技计划项目(2012H58)

摘　　要：结合实际桥梁混凝土强度和钢筋锈蚀检测数据,考虑材料性能经时变化特点,构建了钢筋混凝土桥梁简支梁桥空心板梁弯矩抗力衰减模型;按照《公路工程结构可靠度设计统一标准》(GB/T 50283—1999)建立桥梁结构上的恒载作用效应概率模型和活载作用效应概率模型;以简支板梁跨中弯矩作为功能函数,运用根据JC法所编制的Matlab程序计算每片板梁的可靠指标。运用结构体系失效概率的点估计方法之一——概率网络估算技术,通过近似数值分析计算得出桥梁上部结构体系的可靠指标。并用算例验证了本文所提出的桥梁性能评估方法的正确性和可行性。Considering the material properties variation with time, the hollow beam bending resistance deterioration model of simply supported reinforced concrete beam bridge is constructed based on the field test data about concrete strength and reinforcement corrosion. The structural dead/live load action effect probability models are established respectively according to Unified Standard for Reliability Design of Highway Engineering Structures （ GB/T 50283--1999 ）. Taking the mid-span bending moment of simply supported plate girder as the performance function, the reliability indicator of each plate girder is calculated using Matlab program developed according to JC method. The reliability indicator of the bridge superstructure is obtained through approximate numerical analysis by probabilistic network evaluation technique （PNET）, one of the point estimation method for the failure probability of structural system. The correctness and feasibility of the proposed bridge performance assessment method is verified with a numerical example.

关 键 词：桥梁工程 钢筋混凝土桥梁 性能评估 可靠指标 JC法 

分 类 号：U445.7[建筑科学—桥梁与隧道工程]