基于微波干涉雷达的桥梁拉索基频快速识别方法研究及应用  

Research and Application of Fundamental Frequency Rapid Identification Method Based on Microwave Interferometry Radar for Stay Cables

作　　者：李力 李兴华 谈遂[4] LI Li;LI Xinghua;TAN Sui(State Key Laboratory of Bridge Intelligent and Green Construction,Wuhan 430034,China;China Railway Bridge Science Research Institute,Ltd.,Wuhan 430034,China;China Railway Major Bridge Engineering Group Co.,Ltd.,Wuhan 430050,China;National Engineering Research Center of High-Speed Railway Construction Technology,Changsha 410075,China)

机构地区：[1]桥梁智能与绿色建造全国重点实验室,湖北武汉430034 [2]中铁大桥科学研究院有限公司,湖北武汉430034 [3]中铁大桥局集团有限公司,湖北武汉430050 [4]高速铁路建造技术国家工程研究中心,湖南长沙410075

出　　处：《世界桥梁》2023年第6期91-97,共7页World Bridges

基　　金：中国中铁股份有限公司科技研究开发计划项目(2021-专项-08)。

摘　　要：针对微波干涉雷达现场识别桥梁拉索基频过程中存在操作繁琐、人机交互能力差等问题,基于微波干涉雷达测量拉索基频的原理,提出了一种可快速提取拉索位置参数的方法,运用指数平滑法、峰值检测法和自相关算法对雷达散射波形数据进行分析,自动提取拉索位置参数进行拉索基频的快速识别。采用该方法对2座大型斜拉桥斜拉索频率进行识别,并与采用加速度传感器法的拉索频率结果进行对比,结果表明:采用微波干涉雷达识别的拉索频率与加速度传感器法的实测频率相对偏差率在±1.5%以内,验证了该方法的可靠性;基于微波干涉雷达的桥梁拉索基频快速识别方法省时省力,可一次性快速获取多根拉索的位置参数并进行基频识别,自动化程度高。The microwave interferometry radar is capable of measuring the fundamental frequencies of stay cables,based on measuring principle of which,a method to rapidly extract the location parameters of a stay cable is proposed,aiming to simplify the operation of fundamental frequency measurement and identification on site and overcomes the challenge of poor human-computer interaction.The radar scattering waveform data were analyzed by exponential smoothing,peak detection,and autocorrelation algorithms,to automatically extract the location parameters of stay cables to rapidly identify the fundamental frequencies of the stay cables.The method has been applied in two existing long-span cable-stayed bridges,the results were compared with those obtained by the accelerometers.It is shown that there is a difference within the range of±1.5%between the fundamental frequencies obtained by the microwave interferometry waves and registered in the accelerometers,proving the reliability of the method.The proposed method based on the microwave interferometry waves is quite time-and energy-saving,which is capable of extracting location parameters of multiple stay cables at one time and identifying fundamental frequencies,in a highly automated manner.

关 键 词：桥梁拉索 基频 微波干涉雷达 拉索位置参数 快速识别 频率测试 工程应用 

分 类 号：U443.38[建筑科学—桥梁与隧道工程] U446.3[交通运输工程—道路与铁道工程]