强度包线参数不确定性对土层地震反应影响研究  

Influence of parameter uncertainty of strength envelope on seismic response of soil layer

作　　者：段长辉 齐文浩[1,2] 李尔超 DUAN Changhui;QI Wenhao;LI Erchao(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：《地震工程与工程振动》2023年第3期169-180,共12页Earthquake Engineering and Engineering Dynamics

基　　金：河北省地震灾害防御与风险评价重点实验室开放基金项目(FZ213107);黑龙江省科学基金项目(LH2021E121)。

摘　　要：基于地震动衰减模型获取的强度包线参数是人工合成地震动的必备参数之一,目前已有多种地震动衰减模型成果,各自得到的结果有一定差异性,这势必影响土层地震反应分析结果以及基于此结果确定出的设计地震动参数。为研究这一影响,设定不同的震级、震中距,利用各衰减模型分别计算强度包线参数,获取对应的各强度包线参数的分布范围,并均匀划分取值点,以典型的不同强度加速度反应谱作为目标谱,人工合成一系列地震动并作为输入,计算来源与实际工程中不同场地类别的代表性场地的土层地震反应。研究表明:单独改变三个包线参数的大小对同一场地的地表峰值加速度并没有明显影响;部分场地随着t1、ts、c的增长,在某些区间呈现相反的变化趋势;部分类别场地之间的地表峰值加速度在震中距与震级变化时差值大致固定。强度包线参数的不确定性对土层地震反应分析结果有重要影响,人工合成地震动时要慎重选取。The strength envelope parameter based on the ground motion attenuation model is one of the essential parameters of synthetic earthquake ground motion.There were a variety of ground motion attenuation model results,and their conclusions have certain difference.It is bound to affect the soil seismic response analysis and the design ground motion parameters determined on this result.For the study of the influence,set different magnitudes,epicentral distances,use the intensity attenuation model to calculate package line parameters separately,obtain the corresponding distribution range of the strength envelope parameters,and evenly divide the value points,In a typical different intensities of acceleration response spectrum as the target spectrum,synthetic and a series of ground motion as input,the soil seismic responses of representative sites from different sites are calculated.The results show that changing the parameters of three envelope has no significant effect on the peak ground acceleration of the same site.With the growth of t1,ts and c,some sites show an opposite trend in some sections.The peak ground acceleration of some sites shows a certain rule when the epicentral distance and magnitude change.The uncertainty of intensity envelope parameters has an important influence on the seismic response analysis results of soil layer.

关 键 词：强度包线参数 人工合成地震动 土层地震反应 地表峰值加速度 

分 类 号：P315.9[天文地球—地震学]