位移相关摩擦阻尼基础隔震结构地震分析
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摘要
采用Bouc-Wen滞回模型和库仑摩擦模型来模拟铅芯橡胶隔震垫和摩擦阻尼器的力学模型,建立了位移相关摩擦阻尼隔震结构运动方程.数值分析表明,在常规强震激励下,位移相关摩擦阻尼能减少隔震层位移,但会增加上部结构的层间位移和加速度反应;而在脉冲型近场地震激励下则不仅能显著降低隔震层位移,同时对上部结构的地震响应也有一定的减震效果.参数分析对位移相关摩擦阻尼器的三个主要设计参数的合理选取给出了建议.
Seismic response reduction effect of displacement dependent friction(DDF) damping on base isolated structure with lead rubber bearing(LRB) is investigated.Bouc-Wen hysteretic model and Coulomb friction model are adopted to simulate the mechanical property of LRB and DDF damper respectively.Numerical analysis shows that the DDF damping can reduce base displacement but may increase the inter-storey drift and acceleration response of the superstructure.On the other hand,under the excitation of impulse-type near fault earthquake,DDF damping can significantly mitigate base displacement.Meanwhile the inter-storey drift and acceleration response of the superstructure are also more or less reduced.Besides parametric analysis gives some suggestions on the proper values of the three main factors of the friction damper.
Seismic response reduction effect of displacement dependent friction(DDF) damping on base isolated structure with lead rubber bearing(LRB) is investigated.Bouc-Wen hysteretic model and Coulomb friction model are adopted to simulate the mechanical property of LRB and DDF damper respectively.Numerical analysis shows that the DDF damping can reduce base displacement but may increase the inter-storey drift and acceleration response of the superstructure.On the other hand,under the excitation of impulse-type near fault earthquake,DDF damping can significantly mitigate base displacement.Meanwhile the inter-storey drift and acceleration response of the superstructure are also more or less reduced.Besides parametric analysis gives some suggestions on the proper values of the three main factors of the friction damper.
引文
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[2]张文芳,程文瀼.基础隔震结构设置摩擦阻尼器的地震反应研究[J].土木工程学报,2001,34(5):1-9.ZHANG Wen-fang,CHENG Wen-rang.A model for seismic response of base-isolated structures with friction dampers[J].China Civl Engineering Journal.2001,34(5):1-9.
[3]HEATON T H,HALL J F,WALD D J,et al.Response of high-rise and base-isolated buildings to a hypothetical Mw7.0blind thrust earthquake[J].Science,1995,267(5195):206-211.
[4]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.
[5]NIM D K,RICHTER P J,BACHMAN R E.The use of the energy dissipating restraint for seismic hazard mitiga-tion[J].Earthquake Spectra,1993,9(3):467-489.
[6]MAKRIS N,CONSTANTIONU M C.Analysis of motion resisted by friction.I.Constant Coulomb and linear/Coulomb friction[J].Mechanics of Structures and Machines,1991,19:477-500.
[7]WHITEMAN W E,FERRI A A.Displacement-dependent dry friction damping of a beam-like structure[J].Jour-nal of Sound and Vibration,1996,198(3):313-329.
[8]MOSTAGHEL N,DAVIS T.Representations of Coulomb friction for dynamic analysis[J].Earthquake Engineer-ing and Structural Dynamics,1997,26(5):541-548.
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