中长周期不利地震动研究
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摘要
本文从21次地震事件609条地震记录里面筛选出了6条中长周期不利地震动,分析了这一类特殊地震动相对于普通地震动的特性。分析结果表明,中长周期不利地震动因其中长周期段能量集中,会对高层及超高层等周期较长结构的破坏造成更为不利的影响,建议在中长周期结构的抗震设计中采用此类地震动进行复核。为了方便中长周期不利地震动在抗震分析输入时的选用,文中提出了采用多个周期特征参数来描述其频谱特性的方法。
A special series of ground motion,called medium-to-long-period severest ground motion,is defined,and 6 records are selected out from 609 records minuted in 21 earthquake events. Compared with normal ground motions records,these medium-to-long-period ground motion records own several features,which have been analysed in detail. The result shows that seismic response of medium-to-long-period structure caused by these specil class records is more adverse,due to their frequency content properties. Therefore the medium-to-long-period severest ground motions should be considered in seismic design of medium-to-long-period structures like high-rise buildings. Using multi-period parameters to describe the frequency content features of these special ground motion records is proposed in this paper,which is more convenient for ground motion selection in time history analysis.
A special series of ground motion,called medium-to-long-period severest ground motion,is defined,and 6 records are selected out from 609 records minuted in 21 earthquake events. Compared with normal ground motions records,these medium-to-long-period ground motion records own several features,which have been analysed in detail. The result shows that seismic response of medium-to-long-period structure caused by these specil class records is more adverse,due to their frequency content properties. Therefore the medium-to-long-period severest ground motions should be considered in seismic design of medium-to-long-period structures like high-rise buildings. Using multi-period parameters to describe the frequency content features of these special ground motion records is proposed in this paper,which is more convenient for ground motion selection in time history analysis.
引文
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[4]陈奕信,甘锡滢.台湾长周期地震动之设计探讨[C]//第十届中日建筑结构技术交流会论文集.南京:2013,115-121.CHEN Yixin,GAN Xiying.Investigation on long-period ground motion for seismic design in Taiwan[C]//China-Japan Building Structure Technical Seminar.Nanjing,China:2013,115-121.(in Chinese)
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[6]Kumar,M.Castro,J.M.Stafford P.J.,et al.Influence of the mean period of ground motion on the inelastic dynamic response of single and multi degree of freedom systems[J].Earthquake Engineering and Structural Dynanics,2011,40:237-256.
[7]GB50011-2010建筑抗震设计规范[S].北京:中国工业出版社,2010.GB50011-2010 Code for Seismic Design of Buildings[S].Beijing:Building Industry Press of China,2010.(in Chinese)
[8]American Society of Civil Engineers.ASCE 7-10 Minimum Design Loads for Buildings and other Structures.Reston,Virginia,2010.
[9]DGJ08-9-2013上海市建筑抗震设计规程[S].上海:上海市城乡建设和交通委员会,2013DGJ08-9-2013 Code for Seismic Design of Buildings for Shanghai[S].Shanghai:Shanghai Ethnic and Religions Affairs Committee,2013.
[2]李英民,吴哲骞,杨丹,等.高层建筑时程分析响应与地震动参数相关性分析[C]//第十届中日建筑结构技术交流会论文集.南京:2013,122-130.LI Yingmin,WU Zheqian,YANG Dan,et al.High-rise building response time history analysis and correlation analysis of ground motion parameters[C]//China-Japan Building Structure Technical Seminar.Nanjing,China:2013,122-130.(in Chinese)
[3]方小丹,魏琏,周靖.长周期结构地震反应的特点和反应谱[C]//第十届中日建筑结构技术交流会论文集.南京:2013,90-99.FANG Xiaodan,WEI Lian.ZHOU Jing.Seismic response characteristics and response spectrum of long-period structure[c]//China-Japan Building Structure Technical Seminar.Nanjing,China:2013,90-99.(in Chinese)
[4]陈奕信,甘锡滢.台湾长周期地震动之设计探讨[C]//第十届中日建筑结构技术交流会论文集.南京:2013,115-121.CHEN Yixin,GAN Xiying.Investigation on long-period ground motion for seismic design in Taiwan[C]//China-Japan Building Structure Technical Seminar.Nanjing,China:2013,115-121.(in Chinese)
[5]Dixiong Yang,Wei Wang.Nonlocal period parameters of frequency content characterization for near-fault ground motions[J].Earthquake Engineering and Structural Dynamics.2012;,41:1793-1811.
[6]Kumar,M.Castro,J.M.Stafford P.J.,et al.Influence of the mean period of ground motion on the inelastic dynamic response of single and multi degree of freedom systems[J].Earthquake Engineering and Structural Dynanics,2011,40:237-256.
[7]GB50011-2010建筑抗震设计规范[S].北京:中国工业出版社,2010.GB50011-2010 Code for Seismic Design of Buildings[S].Beijing:Building Industry Press of China,2010.(in Chinese)
[8]American Society of Civil Engineers.ASCE 7-10 Minimum Design Loads for Buildings and other Structures.Reston,Virginia,2010.
[9]DGJ08-9-2013上海市建筑抗震设计规程[S].上海:上海市城乡建设和交通委员会,2013DGJ08-9-2013 Code for Seismic Design of Buildings for Shanghai[S].Shanghai:Shanghai Ethnic and Religions Affairs Committee,2013.
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