隔震设计中橡胶隔震支座拉压刚度取值的研究
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摘要
目前隔震支座拉压刚度比的不同取值是否影响隔震结构性能,实际工程隔震设计时选取多大的拉压刚度比才能不影响隔震设计结果,这些问题还没有完全搞清楚。为此,本文选取一RC框架高层隔震结构作为分析对象,考虑隔震支座拉压刚度比的不同取值,对其动力特性、地震反应特性及拉压应力情况进行了对比分析。结果表明,拉压刚度比的不同取值对结构自振周期、顶层加速度及极大压应力的影响幅度较小,但对隔震结构上部楼层剪力、层间位移角及拉应力验算的影响较大,进而可能造成过高或过低地估计上部结构减震系数,给结构造成安全隐患。综合考虑各项参数后,建议在实际开展隔震设计时采用拉压刚度比1/8~1/10。
It is not completely clarified that whether different ratios of tensile and compressive stiffness of isolators would affect the performance of isolated structure.How to select the ratio of tensile and compressive stiffness of isolators in actual project isolation design so as not to affect the results of isolation design is also not completely clarified.For these reasons,a high-rise isolated RC frame structure is selected in the paper as an example,considering the different ratios of tensile and compressive stiffness,the dynamic characteristics,the seismic responses the of the isolated structure and tensile stress and compressive stress of the isolators are compared.These results show that the different ratios of tensile and compressive stiffness have little effect on the structure natural vibration period and the acceleration of the top floor,but have greate effect on the story shears,story drifts of upper floors and the tensile stress checking,and it may result in overestimating or underestimating the horizontal isolation effect,which would cause some dangers to the isolated structure.considering many factors,the 1/8~1/10 ratio of pulling and pushing stiffness is is advised in the actual isolation design.
It is not completely clarified that whether different ratios of tensile and compressive stiffness of isolators would affect the performance of isolated structure.How to select the ratio of tensile and compressive stiffness of isolators in actual project isolation design so as not to affect the results of isolation design is also not completely clarified.For these reasons,a high-rise isolated RC frame structure is selected in the paper as an example,considering the different ratios of tensile and compressive stiffness,the dynamic characteristics,the seismic responses the of the isolated structure and tensile stress and compressive stress of the isolators are compared.These results show that the different ratios of tensile and compressive stiffness have little effect on the structure natural vibration period and the acceleration of the top floor,but have greate effect on the story shears,story drifts of upper floors and the tensile stress checking,and it may result in overestimating or underestimating the horizontal isolation effect,which would cause some dangers to the isolated structure.considering many factors,the 1/8~1/10 ratio of pulling and pushing stiffness is is advised in the actual isolation design.
引文
[1]陈正新.23个橡胶支座撑起一座楼[N].广州日报,2008-05-26(A10).CHEN Zhengxin.23 rubber isolators hold up a building[N].Guangzhou Daily,05-26-2008(A10).(in Chinese)
[2]周福霖.工程结构减震控制[M].北京:科学出版社,1997.ZHOU Fulin.Earthquake energy absorbing control on engineering structure[M].Beijing:Seismological Press,1997.(in Chinese)
[3]程华群,刘伟庆,王曙光.高层隔震建筑设计中隔震支座受拉问题分析[J].地震工程与工程振动,2007,(04):161-166.(in Chinese)CHENG Huaqun,LIU Weiqing,WANG Shuguang.Analysis of the tension of rubber bearings in the design of isolated high-rise buildings[J].Journal of Earthquake Engineering and Engineering Vibration,2007,(04):161-166.(in Chinese)
[4]Institute of architecture in Japan.隔震结构设计[M].刘文光,译.北京:地震出版社,2006.Institute of architecture in Japan.Recommendation for the design of base isolated buildings[M].LIU Wenguang,translation.Beijing:Seismological Press,2006.(in Chinese)
[5]吴任鹏,王曙光,刘伟庆,等.考虑橡胶支座拉压刚度不同取值对隔震效果的影响研究[J].工程抗震与加固改造,2008,30(5):24-28.WU Renpeng,WANG Shuguang,LIU Weiqing,et al.Research on influence of difference between pulling and pushing stiffness of RB&LRB upon the isolation effectiveness[J].Earthquake Resistant Engineering and Retrofitting,2008,30(5):24-28.(in Chinese)
[6]GB 50011-2010建筑抗震设计规范[S].北京:中国建筑工业出版社,2010.GB 50011-2010 Code for Seismic Design of Building[S].Beijing:China Architecture&Building Press,2010.(in Chinese)
[2]周福霖.工程结构减震控制[M].北京:科学出版社,1997.ZHOU Fulin.Earthquake energy absorbing control on engineering structure[M].Beijing:Seismological Press,1997.(in Chinese)
[3]程华群,刘伟庆,王曙光.高层隔震建筑设计中隔震支座受拉问题分析[J].地震工程与工程振动,2007,(04):161-166.(in Chinese)CHENG Huaqun,LIU Weiqing,WANG Shuguang.Analysis of the tension of rubber bearings in the design of isolated high-rise buildings[J].Journal of Earthquake Engineering and Engineering Vibration,2007,(04):161-166.(in Chinese)
[4]Institute of architecture in Japan.隔震结构设计[M].刘文光,译.北京:地震出版社,2006.Institute of architecture in Japan.Recommendation for the design of base isolated buildings[M].LIU Wenguang,translation.Beijing:Seismological Press,2006.(in Chinese)
[5]吴任鹏,王曙光,刘伟庆,等.考虑橡胶支座拉压刚度不同取值对隔震效果的影响研究[J].工程抗震与加固改造,2008,30(5):24-28.WU Renpeng,WANG Shuguang,LIU Weiqing,et al.Research on influence of difference between pulling and pushing stiffness of RB&LRB upon the isolation effectiveness[J].Earthquake Resistant Engineering and Retrofitting,2008,30(5):24-28.(in Chinese)
[6]GB 50011-2010建筑抗震设计规范[S].北京:中国建筑工业出版社,2010.GB 50011-2010 Code for Seismic Design of Building[S].Beijing:China Architecture&Building Press,2010.(in Chinese)
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