基于温度挠度识别斜拉桥拉索损伤的研究

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振动与冲击 ›› 2021, Vol. 40 ›› Issue (23) : 166-174.

论文

基于温度挠度识别斜拉桥拉索损伤的研究

谭冬梅1，姚欢1，陈方望1,吴浩2

作者信息 +

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

TAN Dongmei1, YAO huan1, CHEN Fangwang1, WU hao2

Author information +

文章历史 +

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；首先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。

Abstract

Aiming at the damage identification problem of cable in cable-stayed bridge, a cable damage identification method based on unary linear regression model and damage probability is proposed. Firstly, based on the monitoring data of a cable-stayed bridge in Wuhan under the Beidou three-dimensional monitoring system, the correlation coefficient between the temperature deflections of each measuring point along the length of the bridge is calculated.Firstly,the sensitivity of main beam temperature deflection to cable damage under temperature load was analyzed.and then the damage identification of cable-stayed bridge finite element model and actual cable-stayed bridge is carried out by means of linear regression model and damage probability.The analysis results show that the temperature deflection of the main girder of the cable-stayed bridge has high similarity along the longitudinal direction.,and the regression function constructed by the temperature deflection data between adjacent measuring points has a high degree of fit.And taking the model parameters of the constructed linear regression model as the damage index, the cable damage of the finite element model and the real-time monitoring cable-stayed bridge can be effectively identified.

导出引用

谭冬梅1，姚欢1，陈方望1,吴浩2. 基于温度挠度识别斜拉桥拉索损伤的研究[J]. 振动与冲击, 2021, 40(23): 166-174

TAN Dongmei1, YAO huan1, CHEN Fangwang1, WU hao2. Identification of cable damage for cable-stayed bridge based on temperature deflection[J]. Journal of Vibration and Shock, 2021, 40(23): 166-174

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