某部队科技楼基础隔震体系的地震反应分析
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摘要
主要研究采用叠层橡胶支座的基础隔震体系 ,这种体系安全可靠 ,计算简便 ,应用也最为广泛。建立了双轴对称基础隔震体系的力学模型和运动微分方程 ,并结合工程实例从两个方面进行分析。首先分别对基础隔震与基础固定两种情况进行振型分析 ,从振型形状和振型参与系数可以看出基础隔震体系的第一振型对振动的影响最大。其次 ,通过非线性地震反应时程分析 ,证明隔震效果十分明显 ,该科技楼的设防烈度可由 9度降为 7度。
The essential features of the base isolation system are its flexible layer and damping device. The flexibility increases the fundamental period of upper structure, keeping it away from the region of dominant earthquake energy. The damping device will dissipate earthquake energy and reduce excessive displacement due to the lateral flexibility of the layer. In this paper, the isolation system that is mainly made up of the laminated rubber bearings is studied, because this system is not only safe and liable but also easy to analyse. The mechanical model and the movement differential equation are built for bi axisymetrical base isolation system,and the analyses of engineering example are carried on in two aspects. On the one hand, the modal analysis is respectively performed for base isolated structure and base fixed structure. According to the configuration of mode shape and the mode participation factor, we can find that the first shape is predominant for the base isolation system. On the other hand, the results of nonlinear earthquake time history analysis show that the base isolation system effects are very well, so the intensity can be reduced from 9 degree to 7 degree.
The essential features of the base isolation system are its flexible layer and damping device. The flexibility increases the fundamental period of upper structure, keeping it away from the region of dominant earthquake energy. The damping device will dissipate earthquake energy and reduce excessive displacement due to the lateral flexibility of the layer. In this paper, the isolation system that is mainly made up of the laminated rubber bearings is studied, because this system is not only safe and liable but also easy to analyse. The mechanical model and the movement differential equation are built for bi axisymetrical base isolation system,and the analyses of engineering example are carried on in two aspects. On the one hand, the modal analysis is respectively performed for base isolated structure and base fixed structure. According to the configuration of mode shape and the mode participation factor, we can find that the first shape is predominant for the base isolation system. On the other hand, the results of nonlinear earthquake time history analysis show that the base isolation system effects are very well, so the intensity can be reduced from 9 degree to 7 degree.
引文
[1] GBJ11—89,建筑抗震设计规范[S]
[2] 夹层橡胶垫隔震技术规程编制组,夹层橡胶垫隔震技术规程(第4稿、征求意见稿)[S],1989
[3] 朱伯龙,张琨联建筑结构抗震设计原理[M],上海:同济大学出版社,1991
[4] 周福霖工程结构减震控制[M]地震出版社,1997
[2] 夹层橡胶垫隔震技术规程编制组,夹层橡胶垫隔震技术规程(第4稿、征求意见稿)[S],1989
[3] 朱伯龙,张琨联建筑结构抗震设计原理[M],上海:同济大学出版社,1991
[4] 周福霖工程结构减震控制[M]地震出版社,1997
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