不同基底隔震形式加层结构的动态特性研究  

DYNAMIC CHARACTERISTICS STUDY OF ADDING STORY WITH DIFFERENT ISOLATING SYSTEMS OF FOUNDATION

作　　者：钱晓旭 韩晓健[2] 洪宝宁[3] 彭阳 QIAN Xiaoxu;HAN Xiaojian;HONG Baoning;PENG Yang(School of Urban and Civil Engineering Sciences,Jinling College of Nanjing University,Nanjing 210089,China;College of Civil Engineering,Nanjing Tech University,Nanjing 210009,China;Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering,Hohai University,Nanjing 210098,China;Institute of Architecture Design and Planning Co.,Ltd.,Nanjing University,Nanjing 210009,China)

机构地区：[1]南京大学金陵学院城市与土木工程学院,南京210089 [2]南京工业大学土木工程学院,南京210009 [3]河海大学岩土力学与堤坝工程教育部重点实验室,南京210098 [4]南京大学建筑规划设计研究院有限公司,南京210009

出　　处：《工业建筑》2020年第11期184-189,167,共7页Industrial Construction

摘　　要：基于量纲分析法,按一般低、多层建筑的基本周期(隔震前0.1~0.4 s)满足相似比关系,选用4层钢框架模拟原型结构,2层钢框架模拟加层结构。通过开展加层结构基底隔震体系的模型振动台对比试验,研究基底无隔震、基底滑移隔震和基底组合隔震3种不同方案下加层结构的地震响应特性、隔震效果和减震机制。利用有限元软件再现了未加层原型结构的动力特性。结果表明:1)无隔震方案在加层部分鞭梢效应明显,采用隔震方案后,加层部分及整体地震响应均明显降低;2)滑移隔震的减震率优于组合隔震,而对于最大层间位移的控制劣于组合隔震;3)自振周期0.204 s的4层既有建筑增加2层,通过滑移隔震或组合隔震可显著降低地震响应,提高抗震性能。Based on the method of dimension analysis,the four-floor steel frame structure was designed as existing building( natural period 0. 1 ~ 0. 4 s) and the two-floor steel frame structure was selected as additional story to satisfy simulation ratio. According to the shaking table tests,the seismic behavior of extension-story structure,the isolation effectiveness and mechanism of isolation layer were compared and studied for the fixed base model,base slidingisolation model,combined isolation model. The dynamic characteristic of prototypes were extrapolated by using finite element software. The results showed that: 1) with no base isolation,the added layer would have dramatic increase of the dynamic response due to whiplash effect. 2) After adopting the isolation technology,the dynamic response of superstructures were greatly reduced. The decreasing amplitude ratio and economy of the base sliding isolation were better than the combined isolating system of foundation. Compared with the base sliding isolation,the inter-layer displacement amplitude of combined isolation had been reduced more drastically. 3) The original 4-story structure which the natural vibration period was 0. 204 s with 2 added layers,the seismic response of structure was reduced and the seismic behavior of structure was improved after adopting the base isolation.

关 键 词：加层结构 振动台试验 基底滑移隔震 基底组合隔震 有限元分析 

分 类 号：TU352.12[建筑科学—结构工程]