滑移隔震支座的试验研究及力学模型
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摘要
通过滑移隔震支座的试验研究,探讨了静摩擦系数、动摩擦系数的变化趋势及滑动摩擦系数的影响因素,研究滑移隔震支座的恢复力特性。试验研究表明:静摩擦系数和动摩擦系数都与竖向压力的大小有关,随着竖向压力的增大而逐渐减小;滑动摩擦系数随滑动速度的增大而增大;滑动摩擦系数与频率有关,总的趋势是随着激励频率的增大,摩擦系数增大;滑移隔震支座加硅脂润滑后摩擦系数明显降低;高频激励下摩擦滑移隔震支座的恢复力模型宜采用理想弹塑性模型,低频激励下宜采用刚塑性模型。最后,指出已有摩擦力模型存在的缺陷,并根据试验结果建议了一个新的摩擦力模型,分析表明该模型与试验数据拟合较好。
Based on the experiment of sliding isolation bearings,the variation trend of static and dynamic friction coefficient as well as influencing factor of dynamic friction coefficient are investigated,the restoring force character of sliding isolation bearings is studied.Experimental research indicates that static friction coefficient and dynamic friction coefficient decrease with the increase of vertical pressure.The dynamic friction coefficient enlarges with the increase of both sliding velocity and pumping frequency.The friction coefficient decreases obviously when sliding isolation bearings are lubricated by using silicone grease.Under a high frequency excitation,the ideal elastoplastic model may be adopted for the restoring force model of sliding isolation bearings.The rigid plastic model may be adopted under a low-frequency excitation.Finally,the defect of the existing friction force model is indicated,and a new friction force model is proposed according to the experimental results.The analysis shows that the model fits better with the test data.
Based on the experiment of sliding isolation bearings,the variation trend of static and dynamic friction coefficient as well as influencing factor of dynamic friction coefficient are investigated,the restoring force character of sliding isolation bearings is studied.Experimental research indicates that static friction coefficient and dynamic friction coefficient decrease with the increase of vertical pressure.The dynamic friction coefficient enlarges with the increase of both sliding velocity and pumping frequency.The friction coefficient decreases obviously when sliding isolation bearings are lubricated by using silicone grease.Under a high frequency excitation,the ideal elastoplastic model may be adopted for the restoring force model of sliding isolation bearings.The rigid plastic model may be adopted under a low-frequency excitation.Finally,the defect of the existing friction force model is indicated,and a new friction force model is proposed according to the experimental results.The analysis shows that the model fits better with the test data.
引文
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[3]Constantinou M C,Mokha A,Reinhorn A M.Teflon bearings in base isolationⅡ:modeling[J].Journal of Structural Engineering,ASCE,1990,116(2):455―474.
[4]Mokha A,Constantinou M C,Reinhorn A M.Further results on frictional properties of teflon bearings[J].Journal of Structural Engineering,ASCE,1991,117(2):622―626.
[5]Mokha A,Constantinou M C,Reinhorn A M.Teflon bearings in aseismic base isolation:experimental studies and mathematical modeling[C].Report No.NCEER-88-0038,National Center for Earthquake Engrg.Res,State Univ.of New York,Bufflalo,N,Y,1988.
[6]Constantinou M C,Caccese J,Hawis H G.Frictional characteristics of Teflon-steel interfaces under dynamic conditions[J].Earthquake Engineering and Structural Dynamics,1987,15(6):751―759
[7]Chang K C,Hwang J S,Lee G C.Analytical model for sliding behavior of Teflon-stainless steel interfaces[J].Journal of Engineering Mechanics,ASCE,1990,116(12):2749―2763.
[8]Gael Bondonet,Andre Filiatrault.Frictional response of PTFE sliding bearings at high frequencies[J].Journal of Bridge Engineering,ASCE,1997,2(4):139―148.
[9]Mcmillan A J.A non-linear friction model for self-excited vibrations[J].Journal of Sound and Vibration,1997,205(3):323―335.
[10]Hartog J P Den.Forced vibrations with combined coulomb and viscous friction[C].Trans.ASME APM-59,1931:107―115.
[11]Mostaghel N,Davis T.Representations of coulomb friction for dynamic analysis[J].Earthquake Engineering and Structural Dynamics,1993,22(10):1085―1095.
[12]樊剑,唐家祥.滑移隔震结构的动力特性及地震反应[J].土木工程学报,2000,33(4):11―16.Fan Jian,Tang Jiaxiang.Dynamic characteristics and seismic response of a sliding structure[J].China Civil Engineering Journal,2000,33(4):11―16.(in Chinese)
[13]荣强.并联基础隔震体系的研究[D].南京:东南大学,2007.Rong Qiang.Research on parallel base-isolated system[D].Nanjing:Southeast University,2007.(in Chinese)
[2]Tyler R G.Teflon dynamic test on PTFE sliding layers under earthquake conditions[J].Bulletin of New Zealand National Society for Earthquake Engineering,1977,10(3):129―138.
[3]Constantinou M C,Mokha A,Reinhorn A M.Teflon bearings in base isolationⅡ:modeling[J].Journal of Structural Engineering,ASCE,1990,116(2):455―474.
[4]Mokha A,Constantinou M C,Reinhorn A M.Further results on frictional properties of teflon bearings[J].Journal of Structural Engineering,ASCE,1991,117(2):622―626.
[5]Mokha A,Constantinou M C,Reinhorn A M.Teflon bearings in aseismic base isolation:experimental studies and mathematical modeling[C].Report No.NCEER-88-0038,National Center for Earthquake Engrg.Res,State Univ.of New York,Bufflalo,N,Y,1988.
[6]Constantinou M C,Caccese J,Hawis H G.Frictional characteristics of Teflon-steel interfaces under dynamic conditions[J].Earthquake Engineering and Structural Dynamics,1987,15(6):751―759
[7]Chang K C,Hwang J S,Lee G C.Analytical model for sliding behavior of Teflon-stainless steel interfaces[J].Journal of Engineering Mechanics,ASCE,1990,116(12):2749―2763.
[8]Gael Bondonet,Andre Filiatrault.Frictional response of PTFE sliding bearings at high frequencies[J].Journal of Bridge Engineering,ASCE,1997,2(4):139―148.
[9]Mcmillan A J.A non-linear friction model for self-excited vibrations[J].Journal of Sound and Vibration,1997,205(3):323―335.
[10]Hartog J P Den.Forced vibrations with combined coulomb and viscous friction[C].Trans.ASME APM-59,1931:107―115.
[11]Mostaghel N,Davis T.Representations of coulomb friction for dynamic analysis[J].Earthquake Engineering and Structural Dynamics,1993,22(10):1085―1095.
[12]樊剑,唐家祥.滑移隔震结构的动力特性及地震反应[J].土木工程学报,2000,33(4):11―16.Fan Jian,Tang Jiaxiang.Dynamic characteristics and seismic response of a sliding structure[J].China Civil Engineering Journal,2000,33(4):11―16.(in Chinese)
[13]荣强.并联基础隔震体系的研究[D].南京:东南大学,2007.Rong Qiang.Research on parallel base-isolated system[D].Nanjing:Southeast University,2007.(in Chinese)
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