长周期地震动低频脉冲特性及反应谱分析  

Analysis of low-frequency pulse characteristics and response spectrum for long-period ground motions

作　　者：王博 刘伯权[1] 吴涛[1] 白国良[2] WANG Bo;LIU Boquan;WU Tao;BAI Guoliang(School of Civil Engineering, Chang’an University, Xi’an 710061, China;School of Civil Engineering, Xi’ an University of Architecture and Technology, Xi’an 710055, China)

机构地区：[1]长安大学建筑工程学院,陕西西安710061 [2]西安建筑科技大学土木工程学院,陕西西安710055

出　　处：《地震工程与工程振动》2018年第3期142-151,共10页Earthquake Engineering and Engineering Dynamics

基　　金：国家自然科学基金项目(51708037);中国博士后科学基金面上资助项目(2017M610616);陕西省博士后科研资助项目(2017BSHEDZZ111);中央高校基本科研业务费专项资金资助项目(300102288111;310828173401)~~

摘　　要：综合考虑远场类谐和地震动、近断层向前方向性地震动与近断层滑冲型地震动三类长周期地震动,对比分析不同类型长周期地震动的峰值与持时特征、低频特性、脉冲特性及反应谱特征,并探讨中、美、日、欧抗震设计谱在考虑长周期地震动影响方面的适用性。结果表明:长周期地震动的峰值、持时及反应谱特征明显区别于普通地震动,且三种长周期地震动之间亦存在显著差异;长周期地震动均具有低频脉冲特性,但不同类型长周期地震动在频域与时域内的能量分布规律不同;现行中、美、日、欧抗震设计谱均未综合考虑三类长周期地震动的影响,亟需开展综合考虑三类长周期地震动影响的抗震设计谱研究。The characteristics of peak,duration and response spectrum and the performances of low frequency and pulse of three types of long-period ground motions were compared,including far-field harmonic-like,near-fault forward-directivity and near-fault fling-step ground motions. Then the adequacy of the consideration of the influence of long-period ground motions in the seismic design spectra of Chinese,American,Japanese and European codes was evaluated. The results show that the characteristics of peak,duration and response spectrum of three types of longperiod ground motions are obviously different with ordinary ground motions,and also different among themselves;all long-period ground motions have low-frequency and pulse performances,but different types have different energy distributions in the frequency and time domains respectively;all the currently used seismic design spectra of Chinese,American,Japanese and European codes have less consideration on the influences of three types of long-period ground motions,accelerating a need for the further research.

关 键 词：长周期地震动 低频特性 脉冲特性 反应谱 希尔伯特-黄变换 

分 类 号：P315.9[天文地球—地震学]