移动载荷下桥梁速度响应小波分析多裂纹识别Multiple Damages Identification in a Beam Subjected to Moving Load by Using Wavelet Analysis and Velocity Response
耿佳,张伟伟,赵子龙,耿佳杨
摘要(Abstract)：
讨论了利用简支梁中点的速度响应进行结构多损伤检测的可行性。首先利用有限元计算了移动载荷作用下桥梁中点的位移和速度响应信号,并比较了梁中点动态响应及小波变换对损伤的敏感性。数值研究表明,损伤对速度响应"Gaussian-5"小波分析较敏感。其次,利用此方法可以较方便地识别出损伤位置,并将小波系数局部极大值作为损伤指标(DI)来估计损伤程度。最后,讨论了不同噪声水平、载荷速度对损伤识别结果的影响,表明该方法具有较好的噪声容忍度;当提高载荷速度时,边界影响增强,不利于损伤定位。
关键词(KeyWords)： 桥梁;移动载荷;速度响应;小波分析;多损伤识别
基金项目(Foundation): 国家自然科学基金(11102125);; 山西省基础研究计划(2012021019);; 山西省研究生优秀创新项目(20123108);; 太原科技大学UIT项目(xj2012051)
作者(Author): 耿佳,张伟伟,赵子龙,耿佳杨
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