基于遗传算法的长周期地震动加速度反应谱的拟合  

Study on the fitting of the long-period ground motion acceleration response spectrum based on genetic algorithm

作　　者：张亮泉[1] 于建杰 ZHANG Liangquan;YU Jianjie(School of Civil Engineering,Northeast Forestry University,Harbin 150000,China)

机构地区：[1]东北林业大学土木工程学院

出　　处：《自然灾害学报》2019年第6期17-27,共11页Journal of Natural Disasters

基　　金：中央高校基本科研专项基金项目(2572014CB23)~~

摘　　要：目前,规范设计反应谱因长周期段幅值偏小,衰减形式单一,并不能很好地反应长周期地震动特性,因此采用合理的设计反应谱模型来反应长周期地震动反应谱有着重要意义。为解决这一问题,本文以1999年台湾集集地震中长周期地震动为例,首先,对其按地面加速度、场地类别和抗震设计分组进行分组,并将其与规范设计反应谱进行对比分析;其次,基于长周期加速度反应谱的特点提出了一种适用于长周期地震动的设计反应谱,并对比了其与常规设计反应谱的优劣。研究表明:本文提出的长周期设计反应谱具有更好的适用性;采用遗传算法对长周期地震动反应谱逐一进行拟合并给出相应的谱参数建议取值,并利用2008年汶川地震渭河盆地收集到的长周期地震动验证了谱参数建议取值的合理性,为规范设计反应谱的修订提供了参考。Due to the relatively low long-period amplitude values and its simplex form of attenuation,the normative design response spectrum cannot effectively response to the long-period ground motion characteristics,therefore,it is very significant to adopt a reasonable design response spectrum model to reflect the long-period ground motion response spectrum.In order to solve this problem,this paper takes the long-period ground motion of Taiwan Chi-chi Earthquake in 1999 as an example,firstly,divides it into groups according to ground acceleration,site classification and anti-seismic design sectionalization,and makes a contrastive analysis compared with the normative design response spectrum;secondly,based on the characteristics of long-period acceleration response spectrum,a design response spectrum suitable for long-period ground motions is proposed,at the same time,its advantages and disadvantages are contrasted with those of conventional design response spectrum.The research shows that the long-period design response spectrum proposed in this paper has better applicabilities;the genetic algorithm is used to fit the long-period ground motion response spectrum one by one and the corresponding spectral parameter suggested values are given,what’s more,the long-period ground motions collected in the Weihe Basin of Wenchuan Earthquake in 2008 are used to verify the reasonability of the spectral parameter suggested values,which provide a reference for the revision of the normative design response spectrum.

关 键 词：加速度反应谱 长周期地震动 抗震设计反应谱 遗传算法 

分 类 号：P315.5[天文地球—地震学] P315.9[天文地球—固体地球物理学]