近断层水平-竖向地震作用下基础隔震结构的动力响应
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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甚少,特别是竖向分量考虑更少。通过选取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记录、远场地震记录以及断层附近非脉冲型地震记录作为地震输入,分析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。
During the application process of base-isolated technology,which is a generally acknowledged measure to resist the earthquake action and reduce the loss of building structure.But the near-fault seismic action with a strong shock is not taken into account usually,and the vertical component is less especially.Some earthquake acceleration records,which include the complete horizontal and vertical components from Chi-Chi Earthquake in Taiwan,are selected and divided into three types,near-fault,far-field and non-pulse seismic inputs.The dynamic responses of base-isolated structures and the states of base-isolated supports are analyzed under the horizontal and vertical motivations of those records simultaneously.The results show that the impulsive near--fault earthquakes impact on the medium and long-period base-isolated structures strongly.However the maximum velocity-pulse period of the seismic records do not control the dynamic responses of base-isolated structures absolutely.The seismic vertical component influences the horizontal responses of structures slightly.But base-isolated supports can be in the unsafe tension state under the pulse near-fault earthquake action,and stronger apparently than that under the non-pulse one.
During the application process of base-isolated technology,which is a generally acknowledged measure to resist the earthquake action and reduce the loss of building structure.But the near-fault seismic action with a strong shock is not taken into account usually,and the vertical component is less especially.Some earthquake acceleration records,which include the complete horizontal and vertical components from Chi-Chi Earthquake in Taiwan,are selected and divided into three types,near-fault,far-field and non-pulse seismic inputs.The dynamic responses of base-isolated structures and the states of base-isolated supports are analyzed under the horizontal and vertical motivations of those records simultaneously.The results show that the impulsive near--fault earthquakes impact on the medium and long-period base-isolated structures strongly.However the maximum velocity-pulse period of the seismic records do not control the dynamic responses of base-isolated structures absolutely.The seismic vertical component influences the horizontal responses of structures slightly.But base-isolated supports can be in the unsafe tension state under the pulse near-fault earthquake action,and stronger apparently than that under the non-pulse one.
引文
[1]胡聿贤.地震工程学[M.]北京:地震出版社,2006:67-69.
[2]周福霖.工程结构减震控制[M].北京:地震出版社,1997:14-25.
[3]文波,牛荻涛,张俊发,等.隔震技术在高压电力设施中的应用[J.]工业建筑,2009,39(1):36-41.
[4]GB 50011—2001建筑抗震设计规范[S.]
[5]Malhotra P K.Response of Building to Near-Field Pulse-LikeGround Motions[J.]Earthquake Engineering and StructuralDynamics.1999,28:1309-1326.
[6]左琼,吴强,陈少林,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):186-189,246.
[7]Jangid R S,Kelly J M.Base Isolation for Near-Fault Motions[J.]Earthquake Engineering and Structural Dynamics.2001,30(5):691-707.
[8]Providakis C P.Effect of Supplemental Damping on LRB andFPS 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,2005.
[10]周正华,周壅年,赵刚.强震近场加速度比和反应谱统计值[J].地震工程与工程振动,2002,22(3):15-18.
[11]Niazi M,Bozorgnia Y.Behavior of Near Souoe Peak Vertical and Horizontal Ground Motion over SMART-I Array,Taiwan[J.]Bulletin of Seismological Society Of Ameriea.1991,81:715-732.
[12]Niazi M,Bozorgnia Y.Behavior of Near Source Vertical and Horizontal Response Spectra at SMART-I Array,Taiwan[J.]Journal of earthquake Engineering and Structural 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,2004.
[14]Alavi B,Krawinkler H.Consideration of Near-Fault Ground Motion Effects in Seismic Design[C]//Proceedings 12th World Conference on Earthquake Engineering,New Zealand.2000.
[2]周福霖.工程结构减震控制[M].北京:地震出版社,1997:14-25.
[3]文波,牛荻涛,张俊发,等.隔震技术在高压电力设施中的应用[J.]工业建筑,2009,39(1):36-41.
[4]GB 50011—2001建筑抗震设计规范[S.]
[5]Malhotra P K.Response of Building to Near-Field Pulse-LikeGround Motions[J.]Earthquake Engineering and StructuralDynamics.1999,28:1309-1326.
[6]左琼,吴强,陈少林,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):186-189,246.
[7]Jangid R S,Kelly J M.Base Isolation for Near-Fault Motions[J.]Earthquake Engineering and Structural Dynamics.2001,30(5):691-707.
[8]Providakis C P.Effect of Supplemental Damping on LRB andFPS 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,2005.
[10]周正华,周壅年,赵刚.强震近场加速度比和反应谱统计值[J].地震工程与工程振动,2002,22(3):15-18.
[11]Niazi M,Bozorgnia Y.Behavior of Near Souoe Peak Vertical and Horizontal Ground Motion over SMART-I Array,Taiwan[J.]Bulletin of Seismological Society Of Ameriea.1991,81:715-732.
[12]Niazi M,Bozorgnia Y.Behavior of Near Source Vertical and Horizontal Response Spectra at SMART-I Array,Taiwan[J.]Journal of earthquake Engineering and Structural 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,2004.
[14]Alavi B,Krawinkler H.Consideration of Near-Fault Ground Motion Effects in Seismic Design[C]//Proceedings 12th World Conference on Earthquake Engineering,New Zealand.2000.
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