近断层地震作用下基础隔震结构的振动分析
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摘要
基础隔震技术在目前的结构分析和设计过程中,对于冲击性较强的近断层地震作用考虑较少,特别是对竖向分量的考虑。本文选取1999年台湾集集地震中,含有完整水平与竖向地震分量的近断层速度脉冲型记录与断层附近非脉冲型记录作为地震输入,分析了基础隔震结构在近断层水平—竖向地震分量共同作用下的动力响应以及隔震支座的受力状态。结果表明,脉冲型近断层地震波对中长周期隔震结构的影响较大,最大速度脉冲周期对基础隔震结构动力响应不是绝对控制性因素;近断层地震波竖向分量对基础隔震结构水平向的振动效应影响较小,对隔震支座受力的影响较大,可能导致隔震支座处于不安全的受拉状态,且明显大于非脉冲型地震波的影响。重视近断层地震作用竖向分量的影响可能会有效保证隔震支座的安全。
The base-isolated technology is a generally acknowledged measure to resist the earthquake action and reduce the loss of building structure.But the near-fault seismic action,impulsive strongly,is not taken into account usually,and the vertical component is less especially.Some earthquake acceleration records selected from Chi-Chi Earthquake in Taiwan,including horizontal and vertical components,are divided into two types,near-fault pulse and non-pulse.The structural responses and the stress of base-isolated supports are analyzed under the horizontal and vertical motivations of those records simultaneously.The results show that the maximum velocity-pulse period of the seismic records is the key factor,but it does not control the dynamic responses of base-isolated structures absolutely.And the impulsive near-fault earthquakes impact the medium or long-period base-isolated structures strongly.The seismic vertical component influences the horizontal responses of structures slightly.But base-isolated supports could be in the unsafe tension under the pulse near-fault earthquake motivation,and stronger apparently than under the non-pulse.Focusing on the vertical component of near-fault earthquake moderately during the analysis will guarantee the safety of base-isolated support effectively.
The base-isolated technology is a generally acknowledged measure to resist the earthquake action and reduce the loss of building structure.But the near-fault seismic action,impulsive strongly,is not taken into account usually,and the vertical component is less especially.Some earthquake acceleration records selected from Chi-Chi Earthquake in Taiwan,including horizontal and vertical components,are divided into two types,near-fault pulse and non-pulse.The structural responses and the stress of base-isolated supports are analyzed under the horizontal and vertical motivations of those records simultaneously.The results show that the maximum velocity-pulse period of the seismic records is the key factor,but it does not control the dynamic responses of base-isolated structures absolutely.And the impulsive near-fault earthquakes impact the medium or long-period base-isolated structures strongly.The seismic vertical component influences the horizontal responses of structures slightly.But base-isolated supports could be in the unsafe tension under the pulse near-fault earthquake motivation,and stronger apparently than under the non-pulse.Focusing on the vertical component of near-fault earthquake moderately during the analysis will guarantee the safety of base-isolated support effectively.
引文
[1]胡聿贤.地震工程学[M].北京:地震出版社,2006,67～69Hu Yu-xian.Earthquake Engineering[M].Beijing:Seismological Press,2006,67～69(in Chinese)
[2]周福霖.工程结构减震控制[M].北京:地震出版社,1997,14～25Zhou Fu-lin.Damping Control of Structure Engineering[M].Beijing:Seismological Press(in Chinese)
[3]Robinson W H.Seismic Isolation of Civil Building inNew Zealand[J].Progress in Structural Engineeringand Material,2000,2:328～334
[4]GB 50011-2010,建筑抗震设计规范[S]GB 50011-2010,Code for Seismic Design of Buildings[S](in Chinese)
[5]Malhotra P K.Response of building to near-fieldpulse-like ground motions[J].Earthquake Engineeringand Structural Dynamics,1999,28:1309～1326
[6]左琼,吴强,等.速度脉冲型地震动瞬时输入能特性研究[J].工业建筑,2009,39(sl):186～189,246Zuo Qiong,Wu Qiang,et al.Characteristics ofInstantaneous Input Energy of Ground Motion ContainingVelocity Pulses[J].Industrial Construction,2009,39(sl):186～189,246(in Chinese)
[7]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,2009,31(2):32～38,42Ye Kun,Li Li.Study on the Dynamic Response of LRBBase-isolated Structure under Near-fault Pulse-likeGround Motions[J].Earthquake Resistant Engineeringand Retrofitting,2009,31(2):32～38,42(in Chinese)
[8]Providakis C P.Effect of supplemental damping on LRBand FPS seismic isolators under near-fault ground motions[J].Engineering Structures,2009,(29):80～90
[9]耿淑伟.抗震设计中的地震动输入参数的研究[D].哈尔滨:中国地震局工程力学研究所,2005Geng Shu-wei.Strong Ground Motion Input ParameterFor Seismic Design[D].Harbin:Institute ofEngineering Mechanics China Seismological Bureau,2005(in Chinese)
[10]周正华,周壅年,赵刚.强震近场加速度峰值比和反应谱统计值[J].地震工程与工程振动,2002,22(3):15～18Zhou Zheng-hua,Zhou Yong-nian,Zhao Gang.Statistical analysis of peak ratios and response spectra ofnear-field accelerograms[J].Earthquake Engineeringand Engineering Vibration,2002,22(3):15～18(inChinese)
[11]Niazi M,Bozorgnia Y.Behavior of Near Souoe PeakVertical and Horizontal Ground Motion over SMART-IArray,Taiwan[J].Bulletin of Seismological Society ofAmeriea,1991,81:715～732
[12]Niazi M,Bozorgnia Y.Behavior of Near Source Verticaland Horizontal Response Spectra at SMART-I Array,Taiwan[J].Journal of Earthquake Engineering andStructural Dynamies,1992,21:37～50
[13]李新乐.近断层区桥梁结构的设计地震与抗震性能研究[D].北京:北京交通大学,2004Li Xin-le.Seismic Design and Performance of Bridges inNear-fault Zones[D].Beijing:Beijing JiaotongUniversity,2004(in Chinese)
[14]Alavi B,Krawinkler H.Consideration of near-faultground motion effects in seismic design[A].Proceedings 12th World Conference on EarthquakeEngineering[C],New Zealand,2000
[2]周福霖.工程结构减震控制[M].北京:地震出版社,1997,14～25Zhou Fu-lin.Damping Control of Structure Engineering[M].Beijing:Seismological Press(in Chinese)
[3]Robinson W H.Seismic Isolation of Civil Building inNew Zealand[J].Progress in Structural Engineeringand Material,2000,2:328～334
[4]GB 50011-2010,建筑抗震设计规范[S]GB 50011-2010,Code for Seismic Design of Buildings[S](in Chinese)
[5]Malhotra P K.Response of building to near-fieldpulse-like ground motions[J].Earthquake Engineeringand Structural Dynamics,1999,28:1309～1326
[6]左琼,吴强,等.速度脉冲型地震动瞬时输入能特性研究[J].工业建筑,2009,39(sl):186～189,246Zuo Qiong,Wu Qiang,et al.Characteristics ofInstantaneous Input Energy of Ground Motion ContainingVelocity Pulses[J].Industrial Construction,2009,39(sl):186～189,246(in Chinese)
[7]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,2009,31(2):32～38,42Ye Kun,Li Li.Study on the Dynamic Response of LRBBase-isolated Structure under Near-fault Pulse-likeGround Motions[J].Earthquake Resistant Engineeringand Retrofitting,2009,31(2):32～38,42(in Chinese)
[8]Providakis C P.Effect of supplemental damping on LRBand FPS seismic isolators under near-fault ground motions[J].Engineering Structures,2009,(29):80～90
[9]耿淑伟.抗震设计中的地震动输入参数的研究[D].哈尔滨:中国地震局工程力学研究所,2005Geng Shu-wei.Strong Ground Motion Input ParameterFor Seismic Design[D].Harbin:Institute ofEngineering Mechanics China Seismological Bureau,2005(in Chinese)
[10]周正华,周壅年,赵刚.强震近场加速度峰值比和反应谱统计值[J].地震工程与工程振动,2002,22(3):15～18Zhou Zheng-hua,Zhou Yong-nian,Zhao Gang.Statistical analysis of peak ratios and response spectra ofnear-field accelerograms[J].Earthquake Engineeringand Engineering Vibration,2002,22(3):15～18(inChinese)
[11]Niazi M,Bozorgnia Y.Behavior of Near Souoe PeakVertical and Horizontal Ground Motion over SMART-IArray,Taiwan[J].Bulletin of Seismological Society ofAmeriea,1991,81:715～732
[12]Niazi M,Bozorgnia Y.Behavior of Near Source Verticaland Horizontal Response Spectra at SMART-I Array,Taiwan[J].Journal of Earthquake Engineering andStructural Dynamies,1992,21:37～50
[13]李新乐.近断层区桥梁结构的设计地震与抗震性能研究[D].北京:北京交通大学,2004Li Xin-le.Seismic Design and Performance of Bridges inNear-fault Zones[D].Beijing:Beijing JiaotongUniversity,2004(in Chinese)
[14]Alavi B,Krawinkler H.Consideration of near-faultground motion effects in seismic design[A].Proceedings 12th World Conference on EarthquakeEngineering[C],New Zealand,2000
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