平扭耦联隔震体系隔震支座阻尼分布影响分析
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摘要
为了研究铅芯橡胶隔震支座的阻尼分布对平扭耦联隔震体系隔震效果的影响,本文对一个三层两跨钢框架,通过调整上部结构负重块位置及下部铅芯橡胶隔震支座的分布位置,进行不同偏心工况下平扭耦联隔震体系地震模拟振动台试验,获得了不同偏心工况、不同阻尼分布情况下结构位移和加速度的时程曲线。试验和分析表明:隔震层阻尼中心与上部结构的质心位置接近,或者增大隔震层的阻尼半径,可显著地降低上部结构的扭转反应。
The purpose of this paper is to study the isolation effect of damping distribution of the lead rubber isolation bearings on lateral-torsional coupling isolated system.A series of shaking table tests of the lateral-torsional coupling isolated system under different eccentric conditions are carried out for a 3-storey,2-span steel frame,with changing the locations of upper loads and the isolation bearings.Structural displacement and alleleration time-history curves are obtained under different eccentric conditions and different damping distributions.The experimental results show that making the damping center of the isolation layer close to the stiffness center of the superstructure or increasing damping radius of the isolation layer can significantly reduce the torsional responses of the superstructure.
The purpose of this paper is to study the isolation effect of damping distribution of the lead rubber isolation bearings on lateral-torsional coupling isolated system.A series of shaking table tests of the lateral-torsional coupling isolated system under different eccentric conditions are carried out for a 3-storey,2-span steel frame,with changing the locations of upper loads and the isolation bearings.Structural displacement and alleleration time-history curves are obtained under different eccentric conditions and different damping distributions.The experimental results show that making the damping center of the isolation layer close to the stiffness center of the superstructure or increasing damping radius of the isolation layer can significantly reduce the torsional responses of the superstructure.
引文
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[4]李向真,王铁成,雷丽.平面非规则隔震结构性能参数对地震反应的影响[J].地震工程与工程振动,2006,26(6):196-199.LI Xiangzhen,WANG Tiecheng,LEI Li.Influence of performance parameters of isolated irregular structures on earthquake responses[J].Earth-quake Engineering and Engineering Vibration,2006,26(6):196-199.(in Chinese)
[5]日本免震构造协会.图解隔震结构入门[M].北京:科学出版社,1998:54-74.Japanese Seismic Structure Association.Introduction to graphic isolated structure[M].Beijing:Science Press,1998:54-74.(in Chinese)
[2]武田寿一.建筑物隔震防振与控振[M].北京:中国建筑工业出版社.1997:80-96.Takeda Hisaichi.Isolation,vibration prevention and control of building[M].Beijing:China Architecture&Building Press,1997:80-96.(in Chi-nese)
[3]黄襄云.层间隔震减震结构的理论分析和振动台试验研究[D].西安:西安建筑科技大学,2008.HUANG Xiangyun.Theoretical and experimental investigation on mid-story seismic isolation and reduction structures[D].Xin:Xin University ofArchitecture and Technology,2008.(in Chinese)
[4]李向真,王铁成,雷丽.平面非规则隔震结构性能参数对地震反应的影响[J].地震工程与工程振动,2006,26(6):196-199.LI Xiangzhen,WANG Tiecheng,LEI Li.Influence of performance parameters of isolated irregular structures on earthquake responses[J].Earth-quake Engineering and Engineering Vibration,2006,26(6):196-199.(in Chinese)
[5]日本免震构造协会.图解隔震结构入门[M].北京:科学出版社,1998:54-74.Japanese Seismic Structure Association.Introduction to graphic isolated structure[M].Beijing:Science Press,1998:54-74.(in Chinese)
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