基于小波分析和移动荷载动力响应的连续梁损伤识别研究  

Study of Continuous Beam Damage Identification Based on Wavelet Analysis and Live-Load Dynamic Response

作　　者：孙增寿[1] 李晓鹏 韩培琰 SUN Zeng-shou LI Xiao-peng HAN Pei-yan(School of Civil Engineering, Zhengzhou University, Zhengzhou 450001, China Luoyang City Construction Survey and Design Institute Co., Ltd., Luoyang 471000, China)

机构地区：[1]郑州大学土木工程学院,河南郑州450001 [2]洛阳城市建设勘察设计院有限公司,河南洛阳471000

出　　处：《世界桥梁》2017年第1期33-38,共6页World Bridges

基　　金：国家自然科学基金项目(50878198)

摘　　要：为了识别连续梁结构的损伤,以每跨25m的两跨等截面连续梁为背景,利用有限元分析,得到完好和有损伤梁在移动荷载作用下某点的位移响应,进而对其位移响应及残差进行连续小波变换,通过小波系数的变化来识别损伤。研究结果表明:可以根据小波系数灰度图进行损伤位置的识别,损伤识别效果受移动荷载速度和不同测点的影响较小。利用小波系数对数指标可以估计损伤程度,而且在存在噪声时,依然可以对损伤位置进行识别。To identify the damage of the continuous girder structure,a continuous girder with two spans of 25 mand constant cross sections was taken as the study background.The displacement responses of a certain point in both the intact and damaged girders under the effect of moving loads were obtained by finite element analysis.And then,the related displacement responses and residuals experienced continuous wavelet transforms to identify damages via the variation of wavelet coefficients.The results of the study indicate that the damage locations can be identified by the grayscale of wavelet coefficients and the identification effect does not show the mark of big influence from the speeds of the moving loads and location changes.The logarithmic index of wavelet coefficient can be used to estimate the damaging degree and is able to identify the damaging locations when there is noise existing.

关 键 词：连续梁 损伤识别 移动荷载 位移响应残差 小波系数 小波系数对数 

分 类 号：U446[建筑科学—桥梁与隧道工程]