基于小波包变换的爆破地震反应谱分析

Analysis of Blasting Seismic Response Spectrum Based on Wavelet Packet Transform

爆破地震反应谱理论能够反映爆破振动作用下结构体的动态响应。选取某项目模型试验测试得到的爆破振动加速度信号为研究对象,采用小波包分析方法将振动信号进行分解和重构,得到爆破振动信号的频谱、时频和能量特性。结合反应谱理论得到各节点小波包重构系数的反应谱曲线,反应谱曲线峰值对应的频率与该节点重构小波包系数主频基本一致。当节点频率增大时,反应谱曲线峰值有增大的趋势,且峰值上升和下降部分由缓变陡。将小波包分析方法和地震反应谱理论结合起来,能够得到爆破振动的精细反应谱,为抗爆破振动设计提供了一种新思路。

Blasting seismic response spectrum theory can reflect the dynamic response of structures under blastingvibration. The blast vibration acceleration signal obtained from the test of a certain project model was selected as the re-search object. The wavelet packet analysis method was used to decompose and reconstruct the vibration signal, and thespectrum, time-frequency and energy characteristics of the blasting vibration signal were obtained. The response spectrumcurve of each node,s wavelet packet reconstruction coefficient was obtained via applying for the response spectrum theory.The frequency corresponding to the peak of the response spectrum curve was basically consistent with the primary frequencyof the reconstructed wavelet packet coefficient. When the node frequency increased, the peak value of the response spec-trum curve increased. The peak rising and falling parts gradually become steeper. Combining the wavelet packet analysismethod with the seismic response spectrum theory, the fine response spectrum of blasting vibration can be obtained, whichprovides a new idea for anti-blasting vibration design.