近场地震动作用下山地隔震框架结构抗震性能  

The Seismic Performance of Mountain Isolated Building Frame Structure under Near-fault Ground Motions

作　　者：杨佑发[1] 刘泳伶[2] 凌玲[2] 

机构地区：[1]重庆大学山地城镇建设与新技术教育部重点实验室,重庆400045 [2]重庆大学,重庆400045

出　　处：《铁道工程学报》2014年第5期6-11,27,共7页Journal of Railway Engineering Society

基　　金：重庆市建设科技计划项目(2011-2-86;2012-9-7)

摘　　要：研究目的:近断层地震动具有明显的长周期高能量的速度脉冲,对隔震结构可能造成严重的破坏,我国大部分山地地区处于地震多发带,对于修筑其上的隔震建筑结构来说,对其抗震性能的研究显得尤为重要。本文通过筛选来自台湾集集地震的不同特性的近断层地震波,并对不同特性的近断层波进行频谱分析,引入多次透射边界以模拟场地的无限性,分别考察上盘效应、脉冲效应、向前方向效应以及滑冲切效应对山区多层接地基础隔震框架结构动力响应的影响。研究结论:(1)未调幅的上盘地震动作用下结构的地震响应大于下盘,调幅后却下盘大于上盘;(2)在含滑冲切效应脉冲、含向前方向性效应脉冲、无速度脉冲地震动作用下,结构的地震响应的大小关系为:含滑冲切效应脉冲>含向前方向性效应脉冲>无速度脉冲;(3)向前方向效应地震动断层法向分量作用下结构的响应明显大于断层平行分量地震动;(4)本文给出了近断层地震动特性对多层接地隔震框架结构地震反应影响的规律,对近震区山地隔震框架结构的设计具有一定参考意义。Research purposes： The distinct long - duration pulse motion of ground velocity in the near - fault region may cause the adverse influence on the seismic performance of the base isolation building. In China, mountainous region account for more than two - thirds of the total geographical area. It＇ s especially important to study the seismic performance of the mountainous isolated structures on complex terrain. Different characteristics of near - fault ground motions from Taiwan Chi - Chi earthquake is chosen, and spectrum analysis is carried out on. It includes the influence on seism response of SSI muhilayer mountain groundbase isolation building of hanging - wall, speed pulse, rupture directivity and fling- step effect.Research conclusions： （ 1 ） The seism response of SSI muhilayer ground base isolation building is found different, which is much greater under hangning - wall than footwall ground motions if the PGA of earthquake is not scaled, but the result is the other way around if the PGA is scaled at 400 gal. （2） It is also found that under the ground motions with rupture forward directivity the seism responses is the greater followed by ground motion with fling - step, and the ground motions without pulses is the smallest. （3） The normal component of fault is greater than the parallel under which the seism response of SSI muhilayer groundbase isolation building. （4） This paper provides the seismic response rules of mountain isolated building frame structure to near- fault ground motions, and also provides valuable reference to seismic design of mountain isolated building.

关 键 词：土-结相互作用 近断层地震动 多层接地 基础隔震 

分 类 号：TU311.3[建筑科学—结构工程]