地震动持时和不同持时指标对结构地震响应的影响  

Effect of Ground Motion Duration and Different Duration Indexes on the Seismic Response of Structures

作　　者：王志涛[1] 赵兴德 郭小东[1] 王巨 王子毅 Wang Zhitao;Zhao Xingde;Guo Xiaodong;Wang Ju;Wang Ziyi(Beijing University of Technology,Faculty of Urban Construction,Beijing 100124;CNOOC LNG Zhejiang Ningbo Energy Co.,Ltd.,Ningbo,Zhejiang 315800)

机构地区：[1]北京工业大学城市建设学部,北京100124 [2]中海油绿能港浙江宁波能源有限公司,浙江宁波315800

出　　处：《震灾防御技术》2024年第2期363-377,共15页Technology for Earthquake Disaster Prevention

摘　　要：选取70条具有不同持时的天然地震波,并采用5%~75%重要持时将谱匹配后的地震记录划分为长、短持时地震记录集,对10层RC框架结构进行IDA分析和弹塑性时程分析,研究地震动持时对结构地震响应的影响,进一步选取35条天然地震波,采用有效持续时间、5%~75%和5%~95%重要持时等不同强震持时指标分别截取相应的加速度时程段,构建不同的地震记录集,分析不同持时指标对RC框架结构峰值响应和滞回耗能的影响。研究结果表明:在相同的地震动强度下,长持时地震动会导致更大的结构层间变形和结构倒塌概率,且随着持时的增加,结构总滞回耗能大幅增加;在罕遇地震水准下,可选取有效持续时间和5%~95%重要持时指标用于结构层间变形和楼层峰值位移分析,而在极罕遇地震水准下,选用有效持续时间具有更高的可靠性;对于楼层峰值速度,不同地震集计算结果均值和变异系数未表现出明显差异;在相同地震动强度下,建议优先选用有效持续时间用于结构滞回耗能分析。In this paper,70 natural seismic waves with different durations are selected,and the seismic records after spectral matching are divided into long and short-duration seismic record sets with 5%~75%significant duration,IDA analysis and elasto-plastic time-history analysis are carried out for the 10-story RC frame structure to study the effects of seismic duration on the seismic response of the structure.Further,selected 35 natural seismic waves,different seismic record sets were constructed by intercepting the corresponding acceleration time segments with different strong motion duration indexes such as bracketed duration,5%~75%and 5%~95%significant duration.The effects of different duration indexes on peak response and hysteretic energy dissipation of RC frame structures were analyzed.The results show that under the same ground motion intensity,the long duration ground motion will lead to greater inter story deformation and collapse probability of the structure,and the total hysteretic energy dissipation of the structure will increase significantly with the increase of the duration;Under the rare earthquake level,the bracketed duration and 5%~95%significant duration indexes can be selected for the analysis of structural inter story deformation and the peak displacement of the floors,while under the extremely rare earthquake level,the bracketed duration has higher reliability.For the peak velocity of the floor,the mean and variation coefficient of the calculation results of different earthquake sets did not show significant difference;In addition,under the same ground motion intensity,it is recommended to choose the bracketed duration for structural hysteretic energy dissipation analysis.

关 键 词：地震动持时 地震动持时指标 弹塑性时程分析 结构地震响应 

分 类 号：TU311.3[建筑科学—结构工程]