深厚沉积层对地震动持时影响的初步分析  

Preliminary Analysis of the Influence of Deep Sediment Layer on Ground Motion Duration

作　　者：赵茗 张齐 彭刚 谢礼立[3,4] ZHAO Ming;ZHANG Qi;PENG Gang;XIE Lili(Hubei Key Laboratory of Disaster Prevention and Mitigation,Yichang 443002,China;School of Civil Engineering and Architecture,China Three Gorges University,Yichang 443002,China;Institute of Engineer Mechanics,China Earthquake Administration,Harbin 150080,China;School of Civil Engineering,Harbin Institute of Technology,Harbin 150090,China)

机构地区：[1]防灾减灾湖北省重点实验室,湖北宜昌443002 [2]三峡大学土木与建筑学院,湖北宜昌443002. [3]中国地震局工程力学研究所,黑龙江哈尔滨150080 [4]哈尔滨工业大学土木工程学院,黑龙江哈尔滨150090

出　　处：《防灾减灾工程学报》2023年第4期692-700,共9页Journal of Disaster Prevention and Mitigation Engineering

基　　金：湖北省教育厅研究计划优秀中青年人才项目(Q20191210)资助。

摘　　要：基于NGA⁃West2和NIED数据库,以地震动70%重要持时和90%重要持时为研究对象。利用获取的9361组强震记录,采用随机效应回归和残差分析的方法,对典型持时预测模型进行改进,并探究了深厚沉积层对地震动重要持时的影响规律。结果表明:(1)场地沉积层厚度对地震动持时有显著影响,随着沉积层厚度的增大,地震动持时呈现出对数线性增长的趋势;(2)地震动持时的沉积层厚度效应与地震动强度具有相关性。重要持时随Z2.5的对数线性变化系数随地震动强度的增大而减小;(3)地震动持时分别随着震级和断层距的增大而增大,随着VS30的增大而减小;(4)在强震、远场以及软弱场地条件下,深厚沉积层对地震动持时的放大作用越显著。在高层结构的抗震设计时,考虑深厚沉积层场地对地震动持时的影响是有必要的。Based on NGA-West2 and NIED databases,the study object was 70%and 90%significant duration of ground motion.Using the obtained 9361 sets of strong seismic records,the classical duration prediction model is improved by random effect regression and residual analysis,and the influence of the deep sediment layer on the significant duration of ground motion is explored.The results show that:(1)The thickness of the sediment layer has a significant effect on the duration of ground motion.With the increase of sediment layer thickness,the duration shows a logarithmic linear increase trend.(2)The effect of sediment thickness during ground motion is correlated with ground motion intensity.The significant duration decreases with the increase of the logarithmic linear variation coefficient of Z2.5.(3)The duration increases with the increase of magnitude and fault distance,and decreases with the increase of VS30;(4)Under the conditions of a strong earthquake,far-field ground motion and weak site,the amplification effect of the deep sediment layer on the seismic duration is more significant.When designing the seismic resistance of high-rise buildings,it is necessary to consider the influence of deep sediment layers on the duration of ground motion.

关 键 词：深厚沉积层 预测模型 残差分析 强地震动 重要持时 

分 类 号：P315[天文地球—地震学]