结构性能退化对梁桥随机车载响应的影响  

Effect of structural performance degradation on random traffic load response of girder bridge

作　　者：周军勇 陈志星 黄海云[1] 曹飒飒[1] ZHOU Junyong;CHEN Zhixing;HUANG Haiyun;CAO Sasa(College of Civil Engineering,Guangzhou University,Guangzhou 510006,China)

机构地区：[1]广州大学土木工程学院

出　　处：《中国科技论文》2019年第6期647-651,704,共6页China Sciencepaper

基　　金：国家自然科学基金资助项目(51808148)

摘　　要：基于结构力学原理建立桥梁内力影响线与梁段刚度的基础模型,分析内力影响线与梁段刚度变化的关联特性,并结合工程案例分析修正梁段刚度下影响线偏差到随机车载响应误差的传递规律。结果显示:桥梁内力影响线与梁段刚度变化高度相关,具有非线性和非对称性;梁段刚度变化同时改变内力影响线的极值位置和大小;误差从影响线累积到荷载响应层面,具有一致方向性和放大效应,其效果与影响线的形状相关。基于静载试验对案例桥梁进行了有限元梁段刚度修正,相比于设计梁段刚度,随机车载响应误差最大达35%,说明在役桥梁的车辆荷载及剩余寿命评估中,不能忽略因结构性能退化引起梁段刚度变化产生的汽车荷载效应评估误差。A basic model was established based on the principle of structural mechanics for studying the influence line of internal force and structural segment bending stiffness.Relationship between influence line and segment bending stiffness was analyzed.Deviation transfer laws from influence line to random traffic loading response were discussed by a studied girder bridge.Results indicate that the influence line of internal force is highly related with the structural segment stiffness,and the relationship is nonlinear and asymmetry.Variation of segment bending stiffness changes the location and magnitude of the maximum influence ordinate.Deviation accumulates from influence line to random traffic loading response.The direction of deviation is always the same,but the amplified value of deviation depends on the shape of influence line.It is shown that the maximum relative error of random traffic load response of the case bridge is up to 35% after the improvement of segment bending stiffness,which demonstrates that the change of segment bending stiffness caused by structural performance degradation should be precisely considered in the assessment of traffic load response with residual life of in-service bridges.

关 键 词：桥梁工程 结构性能退化 车辆荷载响应 有限元模型修正 

分 类 号：U441.2[建筑科学—桥梁与隧道工程] U448.215[交通运输工程—道路与铁道工程]