基于温度挠度识别斜拉桥拉索损伤的研究  

Identification of cable damage for cable-stayed bridge based on temperature deflection

作　　者：谭冬梅[1] 姚欢 陈方望 吴浩 TAN Dongmei;YAO huan;CHEN Fangwang;WU hao(Hubei Key Lab of Roadway Bridge&Structure Engineering,Wuhan University of Technology,Wuhan 430070,China;School of City and Environmental Sciences,Central China Normal University,Wuhan 430079,China)

机构地区：[1]武汉理工大学道路桥梁与结构工程湖北省重点实验室,武汉430070 [2]华中师范大学城市与环境科学学院,武汉430079

出　　处：《振动与冲击》2021年第23期166-174,共9页Journal of Vibration and Shock

基　　金：国家自然科学基金(51408452);湖北省重点实验室开放基金(DQJJ201906)。

摘　　要：针对斜拉桥中拉索的损伤识别问题,提出一种基于一元线性回归模型和损伤概率的拉索损伤识别方法。首先以武汉某斜拉桥在北斗三维监测系统下的监测数据为依托,计算了沿桥梁纵向各测点的温度挠度之间的相关系数;构建了以相邻两个测点温度挠度作为输入和输出的一元线性回归模型;分析了在温度作用下主梁温度挠度对拉索损伤的敏感性,再采用一元线性回归模型结合损伤概率的拉索损伤识别方法对斜拉桥有限元模型和实际斜拉桥进行损伤识别。分析结果表明,斜拉桥主梁温度挠度沿纵向具有较高的相似性并且相邻测点间温度挠度数据构建的回归函数具有较高拟合度,并且以构建的一元线性回归模型的模型参数作为损伤指标,可分别对有限元模型和实时监测斜拉桥的拉索损伤情况进行有效识别。Here,aiming at cable damage identification problem of cable-stayed bridge,a cable damage identification method based on univariate linear regression model and damage probability was proposed.Firstly,based on the monitored data of a certain cable-stayed bridge in Wuhan city under Beidou 3D monitoring system,correlation coefficients among temperature deflections at various measured points along the bridge’s longitudinal direction were calculated.A univariate linear regression model was constructed taking temperature deflections at two adjacent measured points as input and output.The sensitivity of temperature deflections at main beam to cable damage under action of temperature was analyzed,and then the cable damage identification method based on the univariate linear regression model combined with damage probability was adopted to do damage recognition for the cable-stayed bridge’s finite element model and the actual cable-stayed bridge.The analysis results showed that temperature deflections at main girder of cable-stayed bridge along its longitudinal direction can have higher similarity;the regression function constructed with temperature deflections at adjacent measured points can have higher fitness;taking model parameters of the constructed univariate linear regression model as damage indexes,cable damage situations can be effectively recognized for cable-stayed bridge’s finite element model and actual cable-stayed bridges.

关 键 词：桥梁结构健康监测 温度挠度 一元线性回归 斜拉桥 损伤识别 

分 类 号：U441[建筑科学—桥梁与隧道工程]