不同类型地震动作用下等强度需求谱特征及其影响因素分析  

Research on the constant strength demand spectrum characteristics and its influencing factors under different types of ground motions

作　　者：王亚楠[1] 胡高兴 杜永峰[2] WANG Yanan;HU Gaoxing;DU Yongfeng(School of Civil Engineering,Xi’an Technological University,Xi’an 710021,China;Institute of Earthquake Protection and Disaster Mitigation,Lanzhou University of Technology,Lanzhou 730050,China)

机构地区：[1]西安工业大学建筑工程学院,陕西西安710021 [2]兰州理工大学防震减灾研究所,甘肃兰州730050

出　　处：《四川建筑科学研究》2018年第2期10-15,共6页Sichuan Building Science

基　　金：国家自然科学基金(51778276;51578274);西安工大校长基金(XAGDXJJ15021)

摘　　要：以非弹性单自由度(NSDOF)体系为研究对象,分别选取远场普通地震记录、远场长周期地震记录和近场脉冲型地震记录为输入,对不同类型地震动作用下等强度需求谱特征及其影响因素进行了研究。首先,基于已有研究成果建立了远场长周期地震记录和近场脉冲型地震记录选取准则,从太平洋地震工程研究中心(PEER)地震记录数据库选取了3种不同类型的地震记录,共60条,对其频谱特性进行了对比研究;然后,建立了NSDOF体系运动方程,运用MATLAB进行了编程并求解得到了体系的地震响应,在此基础上建立了等强度需求谱;最后,对比研究了不同类型地震动作用下等强度需求谱的谱形和谱值特征,以及强度折减系数、阻尼比和刚度比对等强度需求谱的影响。研究结果表明:不同类型地震动作用下等强度需求谱的谱形变化不大,谱值在对应周期段差别较大;在特定周期段,增加阻尼比可以对NSDOF体系位移响应起到较好的控制作用,增大强度折减系数可以对体系加速度响应和位移响应同时起到较好的控制作用。A nonelastic single degree of freedom(NSDOF)system was taken as the research object,the characteristics and influencing factors of the constant strength demand spectrum under far-field ordinary seismic ground motion record,far-field long period seismic ground motion record and near-fault pulse-like seismic ground motion record were analysed.Firstly,the selection criteria for far-field long period seismic ground motion record and near-fault pulse-like seismic ground motion record was established based on the research results that have been obtained,a total of 60 ground motion records were chosen from Pacific Earthquake Engineering Research Center(PEER),and the ground motion frequency spectrum characteristics were studied.Secondly,motion equation of the NSDOF system was established,the seismic response of the system was solved by using MATLAB,and on basis of this,the constant strength demand spectrum was constructed.Finally,spectral shape and spectral amplitude characteristics of the constant strength demand spectrum under different types of ground motions were studied,the influence of strength reduction coefficient,damping ratio and stiffness ratio on constant strength demand spectra were also studied.The research results show that the shape of constant strength demand spectra has little change,but the amplitude of constant strength demand spectra changes a lot under different types of seismic ground motions.In the range of certain natural period,the displacement response of NSDOF system can be controlled well by increasing damping ratio,and the acceleration response and displacement response of NSDOF system can be controlled well at the same time by increasing strength reduction coefficient.

关 键 词：单自由度体系 等强度需求谱 脉冲型地震动 长周期地震动 

分 类 号：TU318.1[建筑科学—结构工程]