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
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摘要
对LRB(Lead Rubber Bearing)基础隔震结构在近断层脉冲型地震作用下的动力响应进行了系统参数研究。考虑到近断层脉冲型地震动记录数量的有限性,为了参数研究的方便,提出了人工合成近断层脉冲型地震动的方法,即以实际的常规地震波(即远场地震)为底波,在此基础上叠加上等效脉冲模型来模拟近断层脉冲型地震;以此为输入,系统研究比较了在近断层脉冲型地震和常规地震作用下,LRB基础隔震结构的动力反应特性、不同的近断层脉冲型类型以及近断层脉冲型地震动参数和LRB隔震系统力学性能对上部结构最大绝对加速度和隔震层最大位移的影响。研究表明:LRB基础隔震结构在近断层脉冲型地震作用下,上部结构最大绝对加速度和隔震层最大位移与常规地震作用下相比,均有较大增加,隔震范围有一定减小;近断层地震动的脉冲类型,以及脉冲周期对LRB基础隔震结构的动力反应有很大的影响。
In this paper,parametric study on the dynamic response of LRB(Lead Rubber Bearing) base-isolated structure under near-fault pulse-like ground motions is investigated. Due to the limited number of real near-fault pulse-like records,for the convenience of parametric study,the artificial generated near-fault pulse-like ground motions are simulated by combining the real far-field ground motion with simple equivalent pulses that reflect the near-fault features. Using these artificial generated near-fault pulse-like ground motions,the different dynamic characters of LRB base-isolated structure under near-fault pulse-like and far-field ground motions are studied. Moreover,effect of different pulse types,near-fault ground motion parameters and dynamic properties of LRB isolation system on the maximum absolute acceleration of superstructure and maximum displacement of isolation level is discussed. It can be indicated from the comprehensive study that maximum absolute acceleration of superstructure and maximum displacement of isolation level of LRB base-isolated structures subjected to near-fault pulse-like ground motions are much greater than those under far-field ground motions,effective range of base isolation is narrowed; pulse type and pulse period have significant influence on the dynamic response of LRB base-isolated structures.
In this paper,parametric study on the dynamic response of LRB(Lead Rubber Bearing) base-isolated structure under near-fault pulse-like ground motions is investigated. Due to the limited number of real near-fault pulse-like records,for the convenience of parametric study,the artificial generated near-fault pulse-like ground motions are simulated by combining the real far-field ground motion with simple equivalent pulses that reflect the near-fault features. Using these artificial generated near-fault pulse-like ground motions,the different dynamic characters of LRB base-isolated structure under near-fault pulse-like and far-field ground motions are studied. Moreover,effect of different pulse types,near-fault ground motion parameters and dynamic properties of LRB isolation system on the maximum absolute acceleration of superstructure and maximum displacement of isolation level is discussed. It can be indicated from the comprehensive study that maximum absolute acceleration of superstructure and maximum displacement of isolation level of LRB base-isolated structures subjected to near-fault pulse-like ground motions are much greater than those under far-field ground motions,effective range of base isolation is narrowed; pulse type and pulse period have significant influence on the dynamic response of LRB base-isolated structures.
引文
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[3]Providakis C P.Effect of LRB Isolators and Supplemental Viscous Dampers on Seismic Isolated Buildings under Near-fault Excitations[J].Engineering Structures,2008,30(5):1187～1198
[4]杨迪雄,李刚,程耿东.近断层脉冲型地震动作用下隔震结构地震反应分析[J].地震工程与工程振动,2005,25(2):119～124Yang Di-xiong,Li Gang,Cheng Geng-dong.Seismic Analysis of Base-isolated Structures Subjected to Near-fault Pulse-like Ground Motions[J].Earthquake Engineering and Engineering Vibration,2005,25(2):119～124(in Chinese)
[5]杨迪雄,李刚,程耿东.近断层地震动作用下基础隔震结构的一体化动力优化设计[J].建筑结构学报,2006,27(1):42～49Yang Di-xiong,Li Gang,Cheng Geng-dong.Integrated Dynamic Optimum Design of Base-isolated Structure Subjected to Near-fault Pulse-like Ground Motions[J].Journal of Building Structures,2006,27(1):42～49(in Chinese)
[6]Morlet J,Arens G,Fourgeau E,et al.Wave Propagation and Sampling Theory-1.Complex Signal and Scattering in Multilayered Media[J].Geophysics,1982,47(2):203～221
[7]Morlet J,Arens G,Fourgeau E,et al.Wave Propagation and Sampling Theory-2.Sampling Theory and Complex Waves[J].Geophysics,1982,47(2):222～236
[8]He WL,Agrawal AK.Analytical Model of Ground Motion Pulsesfor the Design and Assessment of Seismic Protective Systems[J].Journal of Structural Engineering,2008,134(7):1177～1188
[9]Mavroeidis G P,Papageorgiou A S.A Mathematical Representation of Near-fault Ground Motions[J].Bulletin of the Seismological Society of America,2003,93(3):1099～1131
[10]Fu Q.Modeling and Prediction of Fault-normal Near-field Ground Motions and Structural Response[D].Stanford University,2005
[11]Makris N,Chang S P.Effect of Viscous,Viscoplastic and Friction Damping on the Response of Seismic Isolated Structures[J].Earthquake Engineering and Structural Dynamics,2000,29(1):85～107
[12]Erdik M,Durukal E.A Hybrid Procedure for the Assessment of Design Basis Earthquake Ground Motions forNear-fault Conditions[J].Soil Dynamics and Earthquake Engineering,2001,21(5):431～443
[13]Dicleli M,Buddaram S.Equivalent Linear Analysis of Seismic-isolated Bridges Subjected to Near-fault Ground Motions with Forward Rupture Directivity Effect[J].Engineering Structures,2007,29(1):21～32
[14]Park S W,Ghasemi H,Shen J,et al.Simulation of the Seismic Performance of the Bolu Viaduct Subjectedto Near-fault Ground Motions[J].Earthquake Engineering and Structural Dynamics,2004,33(13):1249～1270
[15]樊剑,唐家祥.带限位装置的摩擦隔震结构动力特性及地震反应分析[J].建筑结构学报,2001,22(1)Fan Jian,Tang Jia-xiang.Dynamic Characteristics and Earthquake Response Analysis of Structures Supported on Slide-limited Friction Base Isolation System[J].Journal of Building Structures,2001,22(1):20～25(in Chinese)
[16]Kelly J M.Earthquake-resistant Design with Rubber(2nd edn)[M].London:Springer,1997
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