考虑近断层地震的隔震结构增设黏滞阻尼器效果分析
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摘要
介绍了新疆近断层地震动特点及其对隔震结构的影响。在太平洋地震工程中心地震记录数据库中选取2条近断层地震记录EL-CENTRO ARRAY#6波和CHY101波,再加上按规范反应谱拟合的人工时程一起作为输入。以喀什地区某医院隔震加固为背景,对采用铅芯叠层橡胶支座的隔震体系和铅芯叠层橡胶支座与黏滞阻尼器组合的隔震体系进行动力时程对比。分析结果表明,采用铅芯叠层橡胶支座与黏滞阻尼器组合的隔震体系在人工地震动和近断层地震动作用下的隔震效果都比较明显,而仅采用铅芯叠层橡胶支座的隔震体系在近断层地震作用下无明显隔震效果,结构安全性无法保证。为保证隔震结构在各种地震动作用下的稳定性及安全性,应在隔震层中增设黏滞阻尼器,以增大结构的附加阻尼,提高隔震效果。
In the present paper,earthquakes in Xinjiang,China,and the near-fault ground motions were discussed. Base-isolated structures were introduced as well at the beginning.Two earthquake records;EL-CEN-TRO ARRAY #6 and CHYlOl from the Pacific earthquake engineering center,and with a synthetic seismic wave,were used as the input of ground motions for seismic analyses of a hospital building in Kashi in Xinjiang province,China.Seismic responses of this building strengthened by two strategies,base isolation through using Lead-Rubber-Bearings(LRB) and LRB base-isolation along with adding viscous dampers,were compared. Through the comparative study,the isolation effect of the isolated structure only with LRB was not effective under near-fault ground motions,while the LRB isolated structure with additional viscous dampers showed better performances due to the increasing of the damping ratio.To ensure the reliability of the isolated structure in any earthquake situation,the design of the isolated structure need to consider using additional viscous dampers to increase the damping ratio of the isolated structure.
In the present paper,earthquakes in Xinjiang,China,and the near-fault ground motions were discussed. Base-isolated structures were introduced as well at the beginning.Two earthquake records;EL-CEN-TRO ARRAY #6 and CHYlOl from the Pacific earthquake engineering center,and with a synthetic seismic wave,were used as the input of ground motions for seismic analyses of a hospital building in Kashi in Xinjiang province,China.Seismic responses of this building strengthened by two strategies,base isolation through using Lead-Rubber-Bearings(LRB) and LRB base-isolation along with adding viscous dampers,were compared. Through the comparative study,the isolation effect of the isolated structure only with LRB was not effective under near-fault ground motions,while the LRB isolated structure with additional viscous dampers showed better performances due to the increasing of the damping ratio.To ensure the reliability of the isolated structure in any earthquake situation,the design of the isolated structure need to consider using additional viscous dampers to increase the damping ratio of the isolated structure.
引文
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[18]中华人民共和国建设部.GB 50011—2011建筑抗震设计规范[S].北京:中国建筑工业出版社, 2011. Ministry of Construction of the People' s Republic of China.GB 50011—2011 Code for seismic design of buildings[S].Beijing:China Architecture and Building Press,2011.(in Chinese)
[2]赵阳,翁大根,任晓崧,等.复摩擦摆支座应用于楼面隔震研究[J].结构工程师,2012(1),28:73-81. Zhao Yan,Weng Dugen,Ren Xiaosong,et al.Study on floor isolation with multiple friction pendulum system [J].Structural Engineers,2012(1),28:73-81. (in Chinese)
[3]党育,霍凯成.近断层地震各因素对基础隔震结构的影响[J].武汉理工大学学报,2009(14):72-77. Dang Yu,Huo Kaicheng.Effect of characteristics of near-fault ground motions on isolated buildings[J]. Journal of Wuhan University of Technology,2009 (14):72-77.(in Chinese)
[4]包华,洪俊青.近断层地震作用下基础隔震结构的振动分析[J].工程抗震与加固改造,2011(6):38- 44. Bao Hua,Hong Junqing.Vibration analysis of base-isolated structure due to the near-fault seismic motivation [J].Earthquake Resistant Engineering and Retrofitting, 2011(6):38-44.(in Chinese)
[5]叶昆,李黎.LRB基础隔震结构在近断层脉冲型地震作用下的动力响应研究[J].工程抗震与加固改造,2009,(2):32-38. Ye Kun,Li Li.Study on the dynamic response of LRB base-isolated structure under near-fault pulselike ground motions[J].Earthquake Resistant Engineering and Retrofitting,2009,(2):32-38.(in Chinese)
[6]魏俊杰,樊剑,王志彤.近断层地震作用下混合阻尼隔震结构的响应分析[J].工程抗震与加固改造,2007,(5):21-24. Wei Junjie,Fan Jian,Wang Zhitong.Seismic analysis of hybrid damping base-isolated system against near-fault ground motions[J].Earthquake Resistant Engineering and Retrofitting,2007,(5):21-24.(in Chinese)
[7]Heaton T H,Hall J F,Wald D J.Response of highrise and base isolated bulidings to a hypothetical MW 7.0 blind thrust earthquake[J].Science,1995,267 (5195):206-211.
[8]Jangid R S.Optimum lead-rubber isolation bearings foe near fault motions[J].Engineering Structures, 2007,29(10):2503-2513.
[9]冯先岳.论新疆地震地质特征[J].地震地质,1985 (2):35-44. Feng Xianyue.Seismogeological characteristics of the Xinjiang area[J].Seismology and Geology,1985 (2):35-44.(in Chinese)
[10]杨发义.新疆地震构造带及近期地震活动趋势[J].新疆师范大学学报(自然科学版),1993(1): 66-71. Yang Fayi.The seismic tectonic belt and the current possible shifting tendencies of the earthquakes in Xinjiang [J].Journal of Xinjiang Normal University, 1993,(1):66-71.(in Chinese)
[11]胡方秋.新疆地震构造带及其特征[J].内陆地震, 1988(3):268-276. Hu Fangqiu.Xinjiang seismic tectonic belts and their characteristics[J].Inland Earthquake,1988(3 ): 268-276.(in Chinese)
[12]Bray J D,Rodriguez-Marek A.Characterization of forward-directivity ground motions in the near-fault region [J].Soil Dynamics and Earthquake Engineering, 2004,24(11):815.
[13]Alavib B,Krawinkler H.Behavior of moment-resisting frame structures subjected to near-fault ground motions[J].Earthquake Engineering and Structural Dynamics,2004,33:687.
[14]Iwan W D.Drift spectrum;measure of demand for earthquake ground motions[J].Journal of Structural Engineering,1997,123(4):397.
[15]Loh C H,Wan S,Liao W I.Effects of hysteretic model on seismic demands consideration of near-fault ground motions[J].The Structural Design of Tall Buildings,2002,11(1):155-169.
[16]Faccioli E,Paolucci R,Rey J.Displacement spectra for long periods[J].Earthquake Spectra,2004,20 (2):347-376.
[17]党育,杜永峰,李慧.基础隔震结构设计及施工指南[M].北京:中国水利水电出版社,2007. Dang Yu,Du Yongfong,Li Hui.Design and construction of the base isolated structure Guide[M]. Beijing;China Water Power Press,2007.(in Chinese)
[18]中华人民共和国建设部.GB 50011—2011建筑抗震设计规范[S].北京:中国建筑工业出版社, 2011. Ministry of Construction of the People' s Republic of China.GB 50011—2011 Code for seismic design of buildings[S].Beijing:China Architecture and Building Press,2011.(in Chinese)
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