基于特征指标的大跨度自锚式悬索桥损伤识别  

Damage identification of long-span self-anchored suspension bridges based on characteristic indexes

作　　者：陈代海[1] 张云森 李整[1] 许世展 房益林 Chen Daihai;Zhang Yunsen;Li Zheng;Xu Shizhan;Fang Yilin(School of Civil Engineering,Zhengzhou University,Zhengzhou 450001,China;Henan Expressway Development Co.,Ltd.,Zhengzhou 450003,China)

机构地区：[1]郑州大学土木工程学院,郑州450001 [2]河南高速公路发展有限责任公司,郑州450003

出　　处：《国外电子测量技术》2023年第9期177-185,共9页Foreign Electronic Measurement Technology

基　　金：国家自然科学基金(51408557);中国博士后科学基金(2013M541995);河南省交通运输厅计划项目(2020J-2-6)资助。

摘　　要：为研究大跨度悬索桥结构损伤识别的分析方法,构造位移影响线差、位移影响线差曲率和小波包能量相对变化率3种损伤识别指标,提出基于特征指标的桥梁结构损伤识别方法。以郑州桃花峪黄河大桥主桥为例,分析利用3种指标来定位结构损伤位置的差异性,并探讨损伤程度、损伤位置、信号噪音、变速车辆和随机车流等因素对识别效果的影响。结果表明,3种识别指标对桥梁结构损伤均显示出良好的识别效果;随着信噪比等级降低,小波包能量相对变化率(RES)损伤识别指标定位桥梁结构损伤位置的正确率及识别精度呈非线性趋势递减;为了更好地识别桥梁结构损伤位置,车辆行驶速度取20 m/s为宜;随机不等间距车流更有利于定位桥梁结构的损伤位置和损伤程度。In order to investigate the analysis methodology for damage identification in long-span suspension bridge structures,this study establishes three damage identification indicators,deviation of displacement influence line,deviation curvature of displacement influence line,and relative energy rate of wavelet packet energy spectrum.Furthermore,a feature-based damage identification method for bridge structures is proposed.By utilizing the main bridge of the Taohuayu Yellow River Bridge in Zhengzhou as a case study,the disparities in the use of these three indicators are examined to localize the position of structural damage.Additionally,the impact of various factors such as damage severity,location,signal noise,variable-speed vehicles,and random traffic on the identification performance is discussed.The findings demonstrate that all three identification indicators exhibit favorable performance in detecting bridge structure damage.However,as the signal-to-noise ratio diminishes,the accuracy and precision of localizing the position of bridge structure damage using the RES damage identification indicator decline in a nonlinear manner.To enhance the accuracy of identifying the location of bridge structure damage,it is recommended to maintain a vehicle speed of approximately 20 m/s.Furthermore,random and irregular traffic flow is more advantageous for accurately determining the position and extent of bridge structure damage.

关 键 词：桥梁结构损伤识别 位移影响线差 位移影响线差曲率 小波包能量相对变化率 

分 类 号：U446.3[建筑科学—桥梁与隧道工程]