海底与陆地地震动反应谱比定量分析  

Quantitative analysis on the difference of spectral ratios between offshore and onshore ground motions

作　　者：谭景阳 胡进军[1,2] 周旭彤 杨泽西 TAN Jingyang;HU Jinjun;ZHOU Xutong;YANG Zexi(Institute of Engineering Mechanics,China Earthquake Administration,Harbin 150080,China;Key Laboratory of Earthquake Engineering and Engineering Vibration,China Earthquake Administration,Harbin 150080,China)

机构地区：[1]中国地震局工程力学研究所,哈尔滨150080 [2]中国地震局地震工程与工程振动重点实验室,哈尔滨150080

出　　处：《振动与冲击》2021年第2期213-219,227,共8页Journal of Vibration and Shock

基　　金：国家自然科学基金(52078470,51578516);国家重点研发计划项目(2017YFC1500403);黑龙江省“头雁”计划项目。

摘　　要：为了研究海底地震动与陆地地震动反应谱统计特性的差异,选取日本相模湾地区K-net的922组海底地震动记录和KiK-net的4599组陆地地震动记录,通过对海底与陆地地震动标准化弹性加速度反应谱以及弹塑性反应谱的对比分析表明:弹性反应谱的海陆谱比变异较小,平均值可作为定量对比关系;当周期小于0.5 s时海域与陆地地震动的差异较小,当周期0.5 s以上时海域与陆地地震动反应谱的差异明显,海域地震动的竖向分量显著较小;对于等强度延性谱,当震级或震中距较小时,有必要考虑1.5 s及以上周期的水平方向海底与陆地地震动的差别;而对于竖向地震动,则需更加关注0.5 s以下短周期地震动的海底与陆地地震动的差异。To study the difference of the statistical characteristics of response spectrums between offshore and onshore ground motions,922 sets of offshore records of K-net and 4599 sets of onshore records of KiK-net in the Sagami Bay region in Japan were selected.The comparison and analysis of the standardized elastic response spectra and the elastoplastic response spectra of the offshore and onshore ground motions show that:the coefficients of variation of averaged response spectra are small,it is reasonable to take the average value as a quantitative comparable parameter.When the spectral period is less than 0.5 s,the difference between the response spectra of offshore and onshore ground motions is rather small.When the period is longer than 0.5 s,the difference is obvious,and the vertical component of the offshore ground motion is significantly smaller.For the constant-strength ductility spectra,when the seismic magnitude or epicentral distance is small,it is necessary to consider the difference between the horizontal components of offshore and onshore ground motions with spectral period above 1.5 s.For the vertical ground motion,it is necessary to pay more attention to the difference between offshore and onshore ground motions with spectral period below 0.5 s.

关 键 词：海底地震动 陆地地震动 弹性反应谱 等强度延性谱 谱比 

分 类 号：P351.9[天文地球—空间物理学] P751[天文地球—地球物理学]