基于小波理论的近场地震动模拟方法分析

Analysis on Near Field Vibration Simulation Method Basedon Wavelet Theory

针对单脉冲模型的局限性,利用小波变换方法提出了对多脉冲型近场地震动模拟方法,并通过速度时程拟合度、脉冲模型的反应谱和桥梁的时程响应3个方面,与常见采用数学模型的单脉冲模拟方法进行对比。结果表明:常见单脉冲模型和本文模型对单脉冲型地震动的拟合均表现较好,对多脉冲型和长周期型地震动的模拟有明显的优化,以多脉冲型地震动更为明显;验证了本文方法对各类型地震动模拟的可靠性。

In order to study the simulation of near-field ground motion,a multi pulse near-field ground motion simulation method based on wavelet transform is proposed in this paper,which is compared with the common single pulse simulation method using mathematical model.The velocity time history fitting,the response spectrum of the pulse model and the time history response of the bridge are compared.The results show that,compared with the single pulse simulation method,the common single pulse model and the model fit the single pulse ground motion better,and have obvious optimization for the simulation of multi pulse and long-period ground motions,with multi pulse ground motion more obvious.This also verifies the reliability of the proposed method for various types of ground motion simulation.