利用Morlet小波变换识别悬索桥模型模态参数

破坏性试验在实际的桥梁上针对结构损伤的识别和定位研究难以进行,且基于数值模拟的研究又存在较大的局限性,所以模型试验方法在桥梁结构的损伤识别研究中尤为重要。参考润扬大桥,面向损伤识别设计制作了悬索桥试验模型。对该试验模型进行了动态测试,并对Morlet小波变换方法进行模态参数识别的适用性和有效性进行了研究,提出了小波理论识别模态参数的改进方法,将其应用到模型试验中。试验表明,该方法具有使用方便和识别准确的优点。

Modal Identification for Suspension-Bridge Model Using Morlet Wavelet Transform

Based on the research in damage identification and damage localization,model test method appears to be of great importance in the field,because that on one hand the application of destructive test on actual bridges is intolerable,and on the other hand numerical simulation goes with great limitation.With reference to the Runyang suspension bridge,a suspension-bridge model is designed and manufactured for damage identification of structures.Subsequently,the detailed dynamic test of the modal structure and the study of the applicability of modal identification using Morlet wavelet transform are carried out.Besides,some improvements are suggested to the modal identification using Morlet wavelet transform,which are verified by a modal test and analysis.