基于小波包分析的人造地震波合成及应用

摘要

地震是一种危害性极大的突发性自然灾害,与此相关的抗震工程研究一直是土木工程领域的研究热点.输入地震动是地震时程计算分析的首要问题.本文尝试将小波包分析技术应用到人工地震动合成技术中,利用小波基函数所具有的良好时频局部化性质,提出了一种可行的人造地震加速度的合成方法;根据小湾地区的地质条件,以天津波为原始波进行人工合成,得到了满足工程需要的人造地震加速度时程.验证了该方法的可行性和精确性.%The earthquake is a great and sudden natural disaster, and the related engineering research has been a hotpoint subject in the civil engineering. Its primary problem is the input of seismic motion. Here, through attempting to put the wavelet packet decomposition technique into the artificial seismic synthesis technology and using the good time-frequency localization nature of the wavelet function, a feasible synthetic method for artificial seismic motion is proposed. At the same time, based on the seismic geologic conditions of Xiaowan Hydropower Station and taking the Tianjin wave as the initial seismic motion, the time history of the artificial seismic motion is obtained which could meet the needs of the project, so as to verify the feasibility and precision of the method.