【作者】 昌海林；

【导师】 李黎；

【作者基本信息】 华中科技大学 ， 结构工程， 2011， 硕士

【摘要】 在常规地震作用下,隔震结构能够取得良好的隔震效果,但是近断层脉冲型地震动会给结构带来不利的影响。目前,对基础隔震结构的研究主要是针对常规地震,近断层脉冲型地震动对基础隔震结构的影响也有了一定的研究。而层间隔震结构作为一种新型隔震体系,对它的研究仅局限于常规地震,缺乏近断层脉冲型地震动作用下层间隔震结构的响应分析。随着层间隔震结构的不断发展,研究近断层脉冲型地震动作用下层间隔震结构的响应及可能产生的不利影响,对工程结构的地震防护有着十分重要的现实意义,这也对丰富和完善隔震理论有着重要的促进作用。本文以铅芯橡胶隔震支座(LRB)隔震结构为对象,做了以下几方面研究:(1)建立了层间隔震结构的动力分析模型,并给出了该模型在地震作用下的时程分析方法。(2)利用有限元分析软件SAP2000建立了一座七层框架结构的有限元模型,研究了隔震层水平刚度、阻尼和位置等参数对减震效果的影响,并分析了不同隔震层组合下双层隔震结构的隔震效果。(3)在对已有的等效速度脉冲模型进行对比分析后,选择了一种适合土木工程结构进行参数研究的更为简洁的等效速度脉冲模型,并在此基础上给出了更为合理的人工合成近断层脉冲型地震动的方法。(4)依据所提出的方法,使用Matlab软件自编程序人工合成了近断层脉冲型地震波,并与常规地震作用下单层和多层层间隔震结构的地震响应进行了对比分析。更多还原

【Abstract】 Isolated structure shows excellent Performance in effectively reducing the damage resulted from the common ground motion; however behaves poorly under near-fault ground motion. At present, most of research related to the base-isolated structrues is based upon the common ground motion, there is also some investigation into the effect of near-fault ground motion; The story isolation structure is a new type of isolation system, the research is limited to common ground motion; however there is no study on the seismic respanse of story isolation buildings under near-fault pulse-like ground motions. With the develop of story isolation structure, it is necessary to study the the seismic respanse of story isolation buildings and the possible adverse effects under near-fault pulse-like ground motions, it also enriched and improved Isolation Theory. In this paper, isolated structure with lead rubber bearings (LRB) is selected as research object, and the study includes the following aspects:(1) Establishing the dynamic model of story isolation structure and dynamic analysis method.(2) Built the finite element model of a seven-story frame structure using finite element analysis software SAP2000. Analyze the response of isolated single / double-isolated structures in different layers and combinations under common ground motion , and there is some comparative study on base-isolated and seismic structure.(3) opted a more concise equivalent velocity pulse model for the parameters study of civil engineering structure after comparative study on existing equivalent velocity pulse models. and gives a more reasonable synthetic near-fault pulse-type ground motion method on this basis.(4) Synthesized self near-fault pulse-type seismic waves by using the Matlab software program according to the proposed method, comparative study is carried out with single-layer and multi-layers story isolation structure.更多还原