地震动随机性对地表加速度峰值的影响及机理研究  

Effects and mechanisms of ground vibration randomness on peak surface acceleration

作　　者：齐文浩[1,2] 陈方晓 李林芳 张苋凯 QI Wenhao;CHEN Fangxiao;LI Linfang;ZHANG Xiankai(Key Laboratory of Earthquake Engineering and Engineering Vibration,Institute of Engineering Mechanics,China Earthquake Administration,Harbin 150080,China;Key Laboratory of Earthquake Disaster Mitigation,Ministry of Emergency Management,Harbin 150080,China)

机构地区：[1]中国地震局工程力学研究所地震工程与工程振动重点实验室,黑龙江哈尔滨150080 [2]地震灾害防治应急管理部重点实验室,黑龙江哈尔滨150080

出　　处：《岩土工程学报》2023年第S02期7-12,共6页Chinese Journal of Geotechnical Engineering

基　　金：中国地震局工程力学研究所基本科研业务费专项资助项目(2021C07);黑龙江省科学基金项目(LH2021E121)。

摘　　要：人造地震动的随机性对地表加速度峰值有重要影响。基于黑龙江地区土层剪切波速以及土体非线性统计结果建立了3个土层地震反应模型,以黑龙江地区典型基岩加速度反应谱为目标谱,每一目标谱选取400个不同的随机数人工合成400条随机地震动加速度时程作为输入,通过土层地震反应分析得到3个经验模型共10800个地表加速度峰值结果。统计分析了每一目标谱下加速度峰值的分布特征及其差异性,并通过傅里叶谱与目标反应谱对比分析初步解释了造成这一差异性的原因。结果表明:在剖面相同,目标反应谱相同的情况下,不同随机数得到的场地地表加速度峰值存在一定差异,大致呈现正态分布;且这种差异与地表地震动傅里叶谱峰值点周期对应的该地震动目标反应谱谱值的大小呈正相关。The randomness of artificial seismic vibration has important influences on the peak value of ground acceleration.Based on the results of soil layer shear wave velocity and soil body nonlinear statistics,three soil layer seismic response models are established.Taking the typical bedrock acceleration response spectrum of Heilongjiang region as the target one,400 random seismic acceleration intervals are synthesized manually by 400 different random numbers for each target spectrum.Through the experience of soil layer seismic response,10800 peak ground acceleration results are obtained from the three models.The distribution characteristics and differences of acceleration peaks under each target spectrum are analyzed statistically,and the reasons for this difference are explained preliminarily by comparing the Fourier spectrum with target response one.The results show that under the same profile and target response spectrum,there is a certain difference in the peak value of ground surface acceleration obtained by different random numbers,which shows a normal distribution.This difference is positively correlated with the response spectral value of the seismic targets corresponding to the Fourier spectrum peak periods of the surface earthquakes.

关 键 词：随机数 人造地震动 加速度峰值 反应谱 傅里叶谱 

分 类 号：TU432[建筑科学—岩土工程]