近断层加速度脉冲和非加速度脉冲的周期特性及影响因素分析  

Analysis of the Periodic Characteristics and Influencing Factors of Near-fault Acceleration Pulses and Non-acceleration Pulses

作　　者：刘府生[1] 李聪 高勤皓[3] 李万亨 常志旺 张迎宾[2] LIU Fusheng;LI Cong;GAO Qinhao;LI Wanheng;CHANG Zhiwang;ZHANG Yingbin(China Railway Fourth Survey and Design Institute Group Co.,Ltd.,Wuhan 430063,Hubei,China;College of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,Sichuan,China;College of Architectural Engineering,Zhejiang University,Hangzhou 310058,Zhejiang,China;Jiangsu Nuclear Power Co.,Ltd.,Lianyungang 222000,Jiangsu,China)

机构地区：[1]中铁第四勘察设计院集团有限公司,湖北武汉430063 [2]西南交通大学土木工程学院,四川成都610031 [3]浙江大学建筑工程学院,浙江杭州310058 [4]江苏核电有限公司,江苏连云港222000

出　　处：《地震研究》2025年第3期488-495,共8页Journal of Seismological Research

基　　金：四川省自然科学基金(2022NSFSC0456).

摘　　要：相比普通远场地震动,近断层速度脉冲型地震动通常会导致结构产生较大变形,增加结构坍塌风险。速度脉冲可进一步分为加速度脉冲和非加速度脉冲,系统地分析其参数特性及其作用下结构响应有助于近断层工程结构的抗震设计与评估。首先,利用峰点法(PPM)确定脉冲周期T_(P),并与S_(v)法和S_(d)·S_(v)法进行比较分析。其次,通过回归分析,分别给出了两种类型脉冲的脉冲周期T p与矩震级M_(W)的统计模型,以及加速度和非加速度脉冲峰值速度PGV与矩震级M_(W)和断层距R之间的统计模型。最后,分析了两种类型脉冲作用下4种单自由度体系的结构动力响应。结果表明:对短周期结构而言,加速度脉冲相对于非加速度脉冲会导致更严重的结构损伤;对中长周期结构而言,加速度脉冲与非加速度脉冲相比将引起较小的结构反应。It is the near-fault velocity-pulse ground motion,rather than the ordinary far-field ground motion,that causes the structure's significant deformation,and increases the risk of structural collapse.The existing research shows that the velocity pulse can be divided into the acceleration pulse and the non-acceleration pulse.A systematic analysis of the characteristics of the pulse's parameters and structural response under the pulse's action is helpful to the seismic design and the evaluation of the near-fault engineering structures.Firstly,the period of the velocity pulse is determined with the peak-point method,then,the period is compared with the ones obtained with the S_(v)method and the S_(d)·S_(v)method.Secondly,through regression analysis,the statistical model of the relationship between the period of the acceleration pulse(T_(P))and the moment magnitude(M_(W))is given.And the statistical model of the relationship between the period of the non-acceleration pulse(T P)and the moment magnitude(M_(W))is given too.The statistical model of the relationship between the peak velocity of the acceleration pulse(PGV)and the moment magnitude(M_(W))and the fault distance(R)is given.In the same way,the statistical model of the relationship between the peak velocity of the non-acceleration pulse(PGV)and the moment magnitude(M_(W))and the fault distance(R)is given too.Finally,the structural dynamic responses of four single-degree-of-freedom systems to the acceleration impulse and the non-acceleration impulse are analyzed.The results show that for short-period structures,the acceleration pulse causes more serious structural damage than the non-acceleration pulse does;for medium-long period structures,the acceleration pulse causes less structural response than the non-acceleration pulse does.

关 键 词：近断层地震动 加速度脉冲 非加速度脉冲 脉冲周期 单自由度体系 

分 类 号：P315.92[天文地球—地震学]