摘要
一次强震过后会有多次余震的发生,为研究主震过后多次余震对结构性能的影响,以钢筋混凝土框架结构为研究对象,选择112条含有3次余震的真实主余震序列作为地震输入,采用最大层间位移角、顶点最大位移角和改进的Park-Ang损伤指数作为结构损伤参数,开展了结构在主余震序列作用下的累积损伤分析。通过与仅考虑具有最大峰值加速度的一次余震的主余震序列作用下结构损伤进行对比,发现在考虑多次余震的主余震序列中,具有最大峰值加速度的余震对结构的累积损伤起主要控制作用,考虑多次余震对结构造成的附加损伤与考虑最大峰值加速度的余震对结构造成的附加损伤并不显著。
Multiple aftershocks are generally triggered by a strong earthquake.Influences of the mainshock-aftershock sequences including multiple aftershocks on structural performance were investigated.A reinforced concrete frame structure was selected as the target building.A total of 112 earthquake sequences,each of which including 3 aftershocks,were selected as earthquake inputs.The cumulative structural damages due to mainshock-aftershock sequences were obtained in terms of maximum interstory drift angle,maximum top displacement ratio and the modified Park-Ang damage index.The obtained accumulative damages of structures were further compared with those subjected to the mainshock-aftershock sequences considering the single aftershock with the largest peak ground acceleration.Through the comparison,it is indicated that the strongest aftershock plays a dominant role in the structural damages due to mainshock-aftershock sequences,since no significantly additional damages are caused by the multiple aftershocks.
作者
于晓辉
马富梓
吕大刚
YU Xiaohui;MA Fuzi;LV Dagang(Key Lab of Structures Dynamic Behavior and Control of China Ministry of Education,Harbin Institute of Technology,Harbin 150090,China;China National Nuclear Power Engineering Co.,Ltd.,Zhengzhou branch,Zhengzhou 450000,China)
出处
《建筑结构学报》
EI
CAS
CSCD
北大核心
2020年第S02期19-26,共8页
Journal of Building Structures
基金
国家自然科学基金项目(51778198,51678209)
河北省交通运输厅科技项目(TH-201919)
关键词
钢筋混凝土框架
主余震序列
余震
地震损伤
损伤参数
reinforced concrete frame
mainshock-aftershock sequence
aftershock
seismic damage
damage index
