基于小波分析的钢桁梁桥损伤识别的试验研究

Study on damage identification of steel truss bridge based on wavelet analysis

在现有模态理论的基础上,采用小波分析技术,探索适用于桥梁结构损伤识别的方法。利用1∶10的钢桁梁桥缩尺结构进行模型试验,通过拆卸杆件在节点板上螺栓的方式来模拟试验损伤,对结构的模态振型进行曲率模态计算,在Matlab软件中选用Bior3.9小波函数编程,提取曲率模态信号的小波变换系数,根据小波变换奇异点法对比分析桥梁节点的各阶损伤指标,从而判定结构损伤。研究结果表明:该方法能够较好的识别出损伤节点的位置,这为类似工程的理论研究和实践运用提供了一定的参考。

Based on the existing modal theory , the paper explored the method of damage identification of bridge structure by using wavelet analysis technique .Therefore 1∶10 steel truss girder bridge scale struc-ture was tested simulated damage test by removing the rods in the gusset plate bolted way , and made mo-dal curvature calculation for the modal shape of structure .Using Bior3 .9 wavelet function in Matlab soft-ware to program , the paper extracted the wavelet transform coefficient of curvature mode signal and deter -mine the structure damage according to the order of damage index and wavelet singularity analysis method of bridge nodes .The results show that the method can better identify the location of damage nodes and provide a reference for the theory research and application of similar engineering .