复合地基褥垫层上结构水平地震响应分析
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摘要
采用Wilson-θ法,分析了复合地基碎石褥垫层上结构在不同地震动参数El-Centro波作用下的动力反应,假设上部结构为摩擦隔震结构,得到了结构在不同强度地震作用下的动力反应,并与基底固定结构进行了比较。采用了减震系数μr来评价减震的效果,分析结果表明:褥垫层对上部结构有明显的减震作用,并且减震效果随垫层与基础间摩擦系数的减小而显著增加;减震效果还与输入的地震动大小有关,输入的地震动越大,μr值越小。
In this paper,Wilson-θ's time integration scheme is used to analyze the structures with composite foundation cushion. The superstructure is a base-friction-isolated structure,which is isolated from the foundation by the cushion and the friction coefficient between the cushion and the base is constant. Then,the nonlinear responses of structures under El-Centro wave with different seismic parameters are obtained,and the responses are also compared with that of the fixed base structure. Seismic-reduction factor,μr,is introduced to evaluate the vibration reduction effectiveness. With the decreasing of the friction coefficient,vibration reduction improves obviously. It also indicates that the effectiveness of vibration reduction is correlated with the intensity of input seismic wave; the more intensive the seismic input,the less the value of μr.
In this paper,Wilson-θ's time integration scheme is used to analyze the structures with composite foundation cushion. The superstructure is a base-friction-isolated structure,which is isolated from the foundation by the cushion and the friction coefficient between the cushion and the base is constant. Then,the nonlinear responses of structures under El-Centro wave with different seismic parameters are obtained,and the responses are also compared with that of the fixed base structure. Seismic-reduction factor,μr,is introduced to evaluate the vibration reduction effectiveness. With the decreasing of the friction coefficient,vibration reduction improves obviously. It also indicates that the effectiveness of vibration reduction is correlated with the intensity of input seismic wave; the more intensive the seismic input,the less the value of μr.
引文
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[7]周福霖.工程结构减震控制[M].北京:地震出版社,1997Zhou Fu-lin.Vibration-reduction control of engineering structures[M].Beijing:Earthquake Press,1997(in Chinese)
[8]李立,刘德馨.建筑物的滑动隔震[A].隔震技术的研究与应用[C].北京:地震出版社,1991,60～69Li Li,Liu De-xing.Sliding isolation of structures[A].Research and application of isolating techniques[C].Beijing:Earthquake Press,1991,60～69(in Chinese)
[9]王文明.砂层滑动隔震[A].隔震技术的研究与应用[C].北京:地震出版社,1991,99～109Wang Wen-ming.Sad cushion sliding isolation[A].Research and application of isolating techniques[C].Beijing:Earthquake Press,1991,60～69(in Chinese)
[2]赵少伟,窦远明,郭蓉,等.基础下砂垫层隔震性能振动台试验研究[J].河北工业大学学报,2005,34(3):92～97Zhao Shao-wei,Dou Yuan-ming,Guo Rong,et al.An experimental study of isolating properties of sand cushion under the foundation by shakingtable[J].Journal of Hebei University of Technology,2005,34(3):92～97(in Chinese)
[3]徐忠根,周福霖.我国首栋橡胶垫隔震住宅楼动力分析[J].世界地震工程,1992,(1):38～43Xu Zhong-gen,Zhou Fu-lin.Dynamic analysis of the first rubber bearing isolated dwelling of our country[J].World Earthquake Engineering,1992,(1):38～43(in Chinese)
[4]白举科,陈龙珠,赵荣欣.中间层减震结构地震影响实例分析[J].工程抗震与加固改造,2007,29(7):54-58Bai Ju-ke,Chen Long-zhu,Zhao Rong-xin.Analysis of earthquake impacts on the mid-story vibration reduction of structures[J].Earthquake Resistant Engineering and Retrofitting,2007,29(7):54～58(in Chinese)
[5]杨庆,栾茂田,崇鑫柱,等.混凝土底板与碎石垫层室内水平抗滑移试验研究[J].工程勘察,1999,(6),5～7Yang Qing,Luan Mao-tian,Chong Xin-zhu,et al.Testing research on horizontal antiskid features between RC plates and crushed stone cushion.Geotechnical Investigation&Surveying,1999,(6),5～7(in Chinese)
[6]Soong TT,Dargush GF著,董平译.结构工程中的被动消能系统[M].北京:科学出版社,2005Soong TT,Dargush GF.Passive energy dissipationsystems in structural engineering[M].Beijing:Science Press,2005(in Chinese)
[7]周福霖.工程结构减震控制[M].北京:地震出版社,1997Zhou Fu-lin.Vibration-reduction control of engineering structures[M].Beijing:Earthquake Press,1997(in Chinese)
[8]李立,刘德馨.建筑物的滑动隔震[A].隔震技术的研究与应用[C].北京:地震出版社,1991,60～69Li Li,Liu De-xing.Sliding isolation of structures[A].Research and application of isolating techniques[C].Beijing:Earthquake Press,1991,60～69(in Chinese)
[9]王文明.砂层滑动隔震[A].隔震技术的研究与应用[C].北京:地震出版社,1991,99～109Wang Wen-ming.Sad cushion sliding isolation[A].Research and application of isolating techniques[C].Beijing:Earthquake Press,1991,60～69(in Chinese)
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