高通滤波对脉冲型地震动非弹性反应谱的影响  

Effect of High-Pass Filtering on the Inelastic Response Spectra of Impulsive Ground Motions

作　　者：蒲武川[1] 薛耀辉 张孟成 PU Wuchuan;XUE Yaohui;ZHANG Mengcheng(School of Civil Engineering and Architecture,Wuhan University of Technology Wuhan,430070,China)

机构地区：[1]武汉理工大学土木工程与建筑学院,武汉430070

出　　处：《振动．测试与诊断》2021年第5期956-963,1036,共9页Journal of Vibration,Measurement & Diagnosis

基　　金：中央高校基本科研业务费专项资金资助项目(WUT:2019Ⅲ109CG);中央高校基本科研业务费资助项目(195206014)。

摘　　要：近场脉冲型地震动中包含高能量的低频脉冲,滤波处理中的高通滤波会改变低频与其他频率成分间的相对大小,进而对地震动反应谱产生不可忽视的影响。选取了一组近场脉冲型地震动,根据脉冲频率fp定义6种相对截止频率,研究了非因果性高通滤波对等延性非弹性位移反应谱、等延性位移比谱、等延性强度折减系数谱和能量谱等四类反应谱的影响规律。分析结果表明:非弹性反应谱对滤波参数较为敏感;相对截止频率和延性系数越大,滤波后反应谱的变化越显著。截止频率较大时,在局部微小周期段内,滤波可能导致非弹性反应谱急剧变化;当截止频率小于0.2fp时,反应谱特征无显著变化。因此,脉冲型地震动的高通滤波处理应考虑脉冲频率的影响,合理选取截止频率。The near-fault pulse-like ground motion contains a high-energy low-frequency pulse. High-pass filtering changes the relative amplitude between low-frequency pulse components and other frequency ones and then induces non-negligible effects on the response spectra. The relative cutting frequency is defined by considering the pulse frequency fpof ground motion,and six cases of cutting frequency are adopted. The influences of acausal high-pass filtering on the constant ductility inelastic displacement spectra,inelastic displacement ratio spectra,strength reduction factor spectra,and energy spectra are investigated. It is shown that the inelastic response spectra are more sensitive to filter parameters than the elastic spectra. A more significant variation in inelastic response spectra is observed with a large cutting frequency or a significant ductility factor. Moreover,a larger cutting frequency leads to a more significant variation in inelastic response spectra during a short period range. A cutting frequency less than 0.2 fpcauses no significant change in inelastic spectra.

关 键 词：高通滤波 等延性位移反应谱 等延性位移比谱 等延性强度折减系数谱 能量谱 

分 类 号：TH762.2[机械工程—仪器科学与技术] P315.9[机械工程—精密仪器及机械]