考虑余震影响的非延性RC框架模型振动台试验
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摘要
本文对1∶2比例非延性RC框架进行了主余震序列作用下的振动台试验,并对模型的破坏形态、动力特性以及位移反应等进行了分析。输入的主余震序列为三组真实地震动,加载方案采用两个方向分别单向加载以及双向同时加载。实验结果显示:结构的破坏主要发生在梁柱与节点的连接处;随着主余震序列幅值的增大,结构的损伤逐步累积导致结构一阶周期变大;真实主余震序列对结构的损伤与其频率特性密切相关。
The authors of this paper conduct a shaking-table test about a non-ductile RC frame with scaling 1∶ 2 under mainshock-aftershock seismic sequences,and analyze the failure modes,dynamic characteristics and displacement response of the model. The input mainshock-aftershock seismic sequences are three groups of real ground motions,and the loading scheme includes uniaxial and biaxial loading. The test shows that most of the damage to the joint of beams,columns and nodes; the 1st vibration period is increased because of the accumulation of structural damage with the increase of mainshock-aftershock seismic sequences' amplitude; the damage to the model and the frequency characteristic of the real mainshock-aftershock seismic sequences are closely interconnected.
The authors of this paper conduct a shaking-table test about a non-ductile RC frame with scaling 1∶ 2 under mainshock-aftershock seismic sequences,and analyze the failure modes,dynamic characteristics and displacement response of the model. The input mainshock-aftershock seismic sequences are three groups of real ground motions,and the loading scheme includes uniaxial and biaxial loading. The test shows that most of the damage to the joint of beams,columns and nodes; the 1st vibration period is increased because of the accumulation of structural damage with the increase of mainshock-aftershock seismic sequences' amplitude; the damage to the model and the frequency characteristic of the real mainshock-aftershock seismic sequences are closely interconnected.
引文
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[2]USGS.USGS Gircular 1193:Implications for earthquake risk reduction in the United States from the Kocaeli[R].Turkey,earthquake of August17,1999.2000.
[3]Dreger D.,Savage B.Aftershocks of the 1952 kern county,california,earthquake sequence[J].Bulletin of the Seismological Society of America,1998,89:1094-1108.
[4]Hauksson E,Jones L M,Hutton K,et al.The 1992 landers earthquake sequence:seismological observations[J].Journal of Geophysical Research,1992,98(B11):19835-19858.
[5]吕晓健,高孟潭,高战武,等.强余震和主震地面运动分布比较研究[J].地震学报,2007,29(3):295-301.LU Xiaojian,GAO Mengtan,GAO Zhanwu,et al.Comparison of the spatial distribution of ground motion between main shocks and strong aftershocks[J].Acta Seismologica Ainica,2007,29(3):295-301.(in Chinese)
[6]Ruiz-García J.Issues on the Response ofexisting building under maimshock-aftershock seismic sequences[C]∥15th WCEE,Lisboa,2012.
[7]裴强,王丽,全厚辉.钢筋混凝土框架结构参数时变特性的研究[J].地震工程与工程振动,2013,33(1):40-46.PEI Qiang,WANG Li,QUAN Houhui.Study on characteristics of time-varying parameters of reinforced concrete frame structure[J].Journal of Earthquake Engineering and Engineering Vibration,2013,33(1):40-46.(in Chinese)
[8]吕西林,李培振,陈跃庆.12层钢筋混凝土标准框架振动台模型试验的完整数据[R].上海:同济大学土木工程防灾国家重点实验室振动台试验室,2004.LU Xilin,LI Peizhen,CHEN Yueqing.Benchmark test of a 12-story reinforced concrete frame model on shaking table[R].State Key Laboratory of Disaster Reduction in Civil Engineering,Tongji University,2004.(in Chinese)
[9]温瑞智,周正华,任叶飞,等.汶川强余震流动观测与典型余震记录分析[J].地震工程与工程振动,2009,29(5):13-19.WEN Ruizhi,ZHOU Zhenghua,REN Yefei,et al.The mobile strong-motion observation and preliminary analysis of typical records for Wenchuan aftershocks[J].Journal of Earthquake Engineering and Engineering Vibration,2009,29(5):13-19.(in Chinese)
[10]周颖,张翠强,吕西林.振动台试验中地震动选择及输入顺序研究[J].地震工程与工程振动,2012,32(6):32-37.ZHOU Ying,ZHANG Cuiqiang,LU Xilin.Method of ground motion selection and input in shaking table tests[J].Journal of Earthquake Engineering and Engineering Vibration,2012,32(6):32-37.(in Chinese)
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