基于车辆荷载-位移响应动态数字映射模型的在役桥梁健康状态评估方法  

A Method for Assessing Health State of In-Service Bridges Based on Vehicle Load-Displacement Mapping Model

作　　者：陆海珠 沈刚 杜元 程勋煜 丁幼亮[2] LU Haizhu;SHEN Gang;DU Yuan;CHENG Xunyu;DING Youliang(Jiangsu Expressway Engineering Maintenance Technology Co.,Ltd.,Nanjing 210049,China;School of Civil Engineering,Southeast University,Nanjing 210096,China)

机构地区：[1]江苏高速公路工程养护技术有限公司,江苏南京210049 [2]东南大学土木工程学院,江苏南京210096

出　　处：《世界桥梁》2025年第1期71-78,共8页World Bridges

基　　金：国家自然科学基金项目(52378288)。

摘　　要：为研究桥梁服役期间的运行状态,统计分析了江苏省烈士河大桥2018年的动态称重数据和位移响应数据,分别建立车辆荷载与车致位移特征参数的概率分布模型,采用马尔可科夫链蒙特卡罗(MCMC)方法和贝叶斯线性回归方法构建车辆荷载-位移响应动态数字映射模型,提出以映射模型斜率作为桥梁状态评估指标,结合建立的模拟不同损伤程度的大桥多尺度有限元模型,研究其有效性。结果表明:通过概率分析发现大桥车辆荷载和对应的车致位移存在模糊映射关系;基于实测数据建立车辆荷载-位移响应动态数字映射模型,其斜率能够稳定反映桥梁的力学性能;基于有限元的无损和损伤状态车辆荷载-位移响应动态数字映射模型进一步验证了斜率可动态反映桥梁的力学性能变化,清晰表征桥梁结构的损伤程度;采用双样本Z检验方法可识别斜率评估指标的异常分布,进而对桥梁损伤和异常运行状态进行预警。To explore the bridge′s operational status during its service life,this paper statistically analyzes the weigh-in-motion data and displacement response of Lieshi River Bridge in 2018 in Jiangsu Province.The probability distribution models of vehicle load and displacement characteristics are established respectively,and then the dynamic numerical mapping model of vehicle load-displacement response is constructed by using Markov Chain Monte Carlo(MCMC)and Bayesian linear regression.The slope of the mapping model is proposed as an index for bridge status assessment.The effectiveness and accuracy of this index are investigated by simulating the bridge damage with the established multi-scale finite element model.The results show that the vehicle load-displacement mapping model of the bridge can be accurately established by integrating the data from the weigh-in-motion system and the health monitoring system,which can stably reflect the performance of the bridge.The proposed index can effectively reflect the service status of bridges,and the proposed method can warn the bridge damage and abnormal status beyond a certain degree.Two-sample Z-tests can identify the abnormalities in assessment indicators,and in turn warn the damages and abnormal service states of bridges.

关 键 词：桥梁工程 桥梁健康监测 车辆荷载 位移响应 数字建模 损伤预警 评估方法 

分 类 号：U447[建筑科学—桥梁与隧道工程]