持续变刚度摩擦型阻尼器
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摘要
文中提出了一种具有持续可变滑移后刚度的摩擦型阻尼器。与传统摩擦阻尼器相比,这种阻尼器的滑移后刚度随变形增加而持续增长,承载能力显著提高。使用者可以根据不同地震水平下的性能目标调整输出力的大小,因此也为不同目标值下的结构控制提供了一种切实可行的方法。阻尼器采用套筒-活塞式结构,摩擦片通过橡胶层固化到活塞上,橡胶层同时为摩擦片提供面压。摩擦片与套筒内壁形成滑移面,该滑移面的内径沿轴向呈曲线变化,理论分析、数值模拟与试验结果表明,抛物线形的滑移面可提供呈三次函数关系的力与位移关系曲线,持续增长的刚度和出力,有利于改善结构的抗倒塌性能。
A type of friction damper characterized a continuously variable post-sliding stiffness is proposed,which provides an increasing post-sliding force with the accretion of the deformation.It is possible to adjust the output force according to the performance targets at different earthquake levels,thus enlightening a practical approach to the explicit structural control to satisfy all of the required performance objectives.The proposed damper consists of a piston,a rubber layer,friction plates and the jacket.The friction plates and the inside of the jacket constitute the contact pair,or the sliding surface.The friction plates are fixed on the piston through the rubber layer which provides the normal pressure on the sliding surface.The radius of sliding surface varies continuously along the axis of the jacket.Both analyses and experiments reveal that the parabola shape of sliding surface would introduce a cubic force-displacement relationship,which is helpful to prevent a structure from collapse.
A type of friction damper characterized a continuously variable post-sliding stiffness is proposed,which provides an increasing post-sliding force with the accretion of the deformation.It is possible to adjust the output force according to the performance targets at different earthquake levels,thus enlightening a practical approach to the explicit structural control to satisfy all of the required performance objectives.The proposed damper consists of a piston,a rubber layer,friction plates and the jacket.The friction plates and the inside of the jacket constitute the contact pair,or the sliding surface.The friction plates are fixed on the piston through the rubber layer which provides the normal pressure on the sliding surface.The radius of sliding surface varies continuously along the axis of the jacket.Both analyses and experiments reveal that the parabola shape of sliding surface would introduce a cubic force-displacement relationship,which is helpful to prevent a structure from collapse.
引文
[1]Yao J.T.,Concept of structure control[J].Journal of the Structural Division,ASCE,1972,98(7):1567-1574.
[2]Nims D.K,Richter P.J,Bachman R.E.The use of the energy dissipating restraint for seismic hazard mitigation[J].Earthquake Spectra,1993,9(3):467-489.
[3]Soong T.T,Dargush G.F.Passive energy dissipation systems in structural engineering[J].John Wiley&Sons.1997,100-104.
[4]Morgen B.G,Kurama Y.C.Afriction damper for post-tensioned precast concrete beam-to-column joints[C].Proceedings of13th World Confer-ence on Earthquake Engineering,Vancouver,Canada,2004.
[5]魏文晖,瞿伟廉.设置FVD框架结构的非线性地震反应控制研究[J].东南大学学报(自然科学版),2004,34(3):386-389.Wei Wenhui,Qu Weilian.Earthquake-response-control of nonlinear frame structures with friction-viscoelastic damper[J].Journal of Southeast U-niversity(Natural Science Edition),2004,34(3):386-389.
[6]Pall A.S.,Marsh C.Response of friction damped braced frames[J].Journal of the Structural Division,ASCE,1982,108(ST6):1313-1323.
[7]Aiken I.D.,Kelly J.M.Earthquake simulator testing and analytical studies of two energy-absorbing systems for multistory structures[R].Re-port No.UCB/EERC-90/03,University of California,Berkeley,1990.
[8]吴斌,张纪刚,欧进萍.考虑几何非线性的Pall型摩擦阻尼器滞回特性分析[J].工程力学,2003,20(1):21-26.Wu Bin,Zhang Jigang,Ou Jinping.The analysis of hysteretic behavior of pall-typed frictional dampers considering geometry nonlinearity[J].En-gineering Mechanics,2003,20(1):21-26.
[9]欧进萍,吴斌.组合钢板屈服耗能器性能及对其高层钢结构减振效果的试验研究[J].建筑结构学报,2001,22(1),32-39.Ou Jinping,Wu Bin.Experimental study on behavior of composite steel plate yielding energy dissipators and its effectiveness on absorbing seismicvibration of steel tall buildings[J].Journal of Building Structures,2001:22(1),32-39.
[2]Nims D.K,Richter P.J,Bachman R.E.The use of the energy dissipating restraint for seismic hazard mitigation[J].Earthquake Spectra,1993,9(3):467-489.
[3]Soong T.T,Dargush G.F.Passive energy dissipation systems in structural engineering[J].John Wiley&Sons.1997,100-104.
[4]Morgen B.G,Kurama Y.C.Afriction damper for post-tensioned precast concrete beam-to-column joints[C].Proceedings of13th World Confer-ence on Earthquake Engineering,Vancouver,Canada,2004.
[5]魏文晖,瞿伟廉.设置FVD框架结构的非线性地震反应控制研究[J].东南大学学报(自然科学版),2004,34(3):386-389.Wei Wenhui,Qu Weilian.Earthquake-response-control of nonlinear frame structures with friction-viscoelastic damper[J].Journal of Southeast U-niversity(Natural Science Edition),2004,34(3):386-389.
[6]Pall A.S.,Marsh C.Response of friction damped braced frames[J].Journal of the Structural Division,ASCE,1982,108(ST6):1313-1323.
[7]Aiken I.D.,Kelly J.M.Earthquake simulator testing and analytical studies of two energy-absorbing systems for multistory structures[R].Re-port No.UCB/EERC-90/03,University of California,Berkeley,1990.
[8]吴斌,张纪刚,欧进萍.考虑几何非线性的Pall型摩擦阻尼器滞回特性分析[J].工程力学,2003,20(1):21-26.Wu Bin,Zhang Jigang,Ou Jinping.The analysis of hysteretic behavior of pall-typed frictional dampers considering geometry nonlinearity[J].En-gineering Mechanics,2003,20(1):21-26.
[9]欧进萍,吴斌.组合钢板屈服耗能器性能及对其高层钢结构减振效果的试验研究[J].建筑结构学报,2001,22(1),32-39.Ou Jinping,Wu Bin.Experimental study on behavior of composite steel plate yielding energy dissipators and its effectiveness on absorbing seismicvibration of steel tall buildings[J].Journal of Building Structures,2001:22(1),32-39.
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