长周期地震动参数及频谱特征

英文篇名：The parameter and spectrum signature of long-period ground motion
中文刊名：福州大学学报(自然科学版)
英文刊名：Journal of Fuzhou University(Natural Science Edition)
作者：许智星 ; 孙颖 ; 谷音 ; 卓卫东
英文作者：XU Zhi-xing ; SUN Ying ; GU Yin ; ZHUO Wei-dong(College of Civil Engineering ; Fuzhou University ; Fuzhou ; Fujian 350116 ; China)
中文关键词：长周期地震 ; 反应谱 ; 规范设计谱
英文关键词：long-period ground motion ; response spectrum ; code design spectra
出版日期：2013-08-28
机构：福州大学土木工程学院;
年：2013
期：04
出版单位：福州大学学报(自然科学版)

摘要

收集多年来国内外大量地震记录,根据其傅里叶谱的分布形式筛选出近场长周期、远场长周期以及普通地震动等三类,比较分析三者的参数特征,统计分析其平均反应谱及平均规准反应谱,采用最小二乘法对平均规准加速度反应谱进行拟合,并与规范设计谱进行对比.结果表明,长周期地震动反应谱出现峰值的周期较大.针对长周期地震动,建议规范设计谱的平台值以及特征周期应有所提高.
A large number of seismic records that happened at home and abroad in many years are collected,three kinds of ground motions are selected from these seismic records according to Fourier amplitude spectra,that is long-period ground motions of near-field and far-field,ordinary ground motions.The differences between these three kinds of ground motions are analyzed based on their parametric characteristic;average response spectra and average normalized response spectra of them are counted and analyzed.Average normalized response spectra is fitted by least square method and compared with code design spectra.The results indicate that: the period of maximum peak in response spectrum is larger for long-period ground motion,and it is recommended that the βmax and Tg in code design spectra should give a reasonable increase for long-period ground motion.

引文

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