基于非线性能量反应谱的铅芯橡胶支座隔震系统研究

发布时间：2018-08-24 15:12

【摘要】：地震输入结构的能量绝大部分由基础隔震系统消耗。为了在确保罕遇地震作用下结构安全,同时充分发挥基础隔震系统效能,研究者必须精确快速地预测基础隔震系统的地震反应。本文采用Bouc-Wen非线性滞回模型模拟基础隔震系统,对基于Bouc-Wen非线性滞回模型的能量谱,以及应用非线性能量谱进行橡胶支座隔震系统的反应分析方法进行了研究,其研究工作如下： 1)采用Bouc-Wen非线性滞回模型模拟基础隔震系统,建立单自由度基础隔震结构模型,基于龙格库塔方法推导能量反应时程分析和非线性能量谱公式,并便用Matlab编写时程和能量谱分析计算程序。 2)使用20条地震波计算我国抗震规范规定的Ⅱ类场地、第三组设计地震分组,设计基本地震加速度为0.30g地区的隔震建筑,在遭遇罕遇地震时,隔震周期T=ls-6s对应的总滞回耗能谱EY(T)、总阻尼耗能谱ED(T)、总输入能谱E1(T)和延性需求谱μ’(T),并给出其统计结果。 3)提出铅芯橡胶基础隔震系统延性系数μ’与能量指标RY/E1的关系μ'=μ'(EY/EI),建立相应数据库。 4)结合我国现行抗震规范,建立一种基于能量谱的隔震结构反应预测和验算方法。 5)以一个7层的铅芯橡胶支座基础隔震结构为例,进行非线性多自由度时程分析,时程分析结果与基于能量谱的隔震结构反应预测和验算结果进行对比,结果表明本文建立能量谱及其反应预测和验算方法是有效和可靠的。
[Abstract]:In order to ensure the safety of the structure under rare earthquakes and give full play to the effectiveness of the base isolation system, researchers must accurately and quickly predict the seismic response of the base isolation system. Based on the energy spectrum of Bouc-Wen nonlinear hysteretic model and the response analysis method of rubber bearing isolation system with nonlinear energy spectrum, the research work is as follows:
1) The Bouc-Wen nonlinear hysteretic model is used to simulate the base-isolated system, and the single-degree-of-freedom base-isolated structure model is established. Based on Runge-Kutta method, the energy response time-history analysis and nonlinear energy spectrum formula are deduced.
2) Twenty seismic waves are used to calculate the class II sites stipulated in the code for seismic resistance of China. The third group is divided into design seismic groups. The isolated buildings with basic seismic acceleration of 0.30g are designed. When encountering rare earthquakes, the total hysteretic energy spectrum EY (T), total damping energy spectrum ED (T), total input energy spectrum E1 (T) and ductility demand spectrum mu'(T) corresponding to the isolation period T=ls-6s are calculated. And its statistical results are given.
3) The relationship between ductility coefficient of lead rubber base isolation system and energy index RY/E1 is proposed and the corresponding database is established.
4) Based on the current seismic code of our country, a method for predicting and checking the response of isolated structures based on energy spectrum is established.
5) Taking a 7-storey lead rubber bearing base isolation structure as an example, the nonlinear multi-degree-of-freedom time-history analysis is carried out. The results of time-history analysis are compared with those of response prediction and checking calculation based on energy spectrum. The results show that the energy spectrum and its response prediction and checking method are effective and reliable.
【学位授予单位】：湖南大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU352.12

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