基于动力荷载试验的梁式桥损伤识别方法研究  

Research on damage identification of beam bridges based on dynamic load test

作　　者：陈钦禹 刘晨光 田石柱[1] CHEN Qinyu;LIU Chenguang;TIAN Shizhu(School of Civil Engineering,SUST,Suzhou 215011,China)

机构地区：[1]苏州科技大学土木工程学院,江苏苏州215011

出　　处：《苏州科技大学学报（工程技术版）》2024年第1期35-41,共7页Journal of Suzhou University of Science and Technology（Engineering and Technology Edition）

基　　金：国家自然科学基金项目(52208189);江苏省高等学校基础科学(自然科学)面上项目(21KJB580006)。

摘　　要：为进一步提高桥梁动力检测试验的结构性能揭示能力,寻找更为高效实用的桥梁结构损伤识别方法,提出了以桥梁结构车致振动响应为源数据,以连续小波变换进行信号处理,利用信号奇异性进行桥梁损伤识别的方法。通过数值模拟分析了桥梁结构在不同损伤情况下的动力响应信号的小波系数值,利用小波系数模极大值迹线进行损伤定位,并计算李氏指数进行损伤程度识别。结果表明,虽然对裂缝间距大小有一定要求,但利用跑车激振试验数据的小波变换处理,能够在不掌握桥梁精确模型信息情况下,不依赖长期监测试验即可较为准确地识别桥梁结构损伤,具有较高的工程实用价值。In order to further improve the revealing ability of structural performance of bridge dynamic detection test and find a more efficient and practical damage identification for bridge structure,a new method of bridge damage identification is proposed,which takes vehicle-induced vibration response of bridge structure as source data,uses the continuous wavelet transform for signal processing and the signal singularity for signal processing.The wavelet coefficients of dynamic response signals under different damage conditions were analyzed by numerical simulation;the damage location was carried out by the maximum value of the mode;and the Lipschitz index was calculated and the damage intensity was identified.The results show that there are requirements on the size of crack spacing,but the sports car excitation test using wavelet transform can accurately identify and analyze the structural damage in the absence of bridge model information and long-term excitation test,which has high engineering practical value.

关 键 词：桥梁车致振动 损伤识别 连续小波变换 Lipschitz指数(李氏指数) 

分 类 号：TU311[建筑科学—结构工程]