基于短时傅里叶变换的可变摩擦基础隔震系统
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摘要
近断层地震作用可能使被动控制的基础隔震系统产生过大的加速度反应。为克服被动控制隔震系统这一局限性,针对含有可变摩擦阻尼器的基础隔震系统,提出了一种基于对场地加速度信号短时傅里叶变换的控制算法,预估隔震的失效,即时改变隔震层的摩擦阻尼。在三种不同类型的地震波作用下,对一个含有叠层橡胶支座和可变摩擦阻尼器的多自由度层模型使用Simulink进行时程分析。分析表明,该算法控制下的半主动隔震系统能够有效改变被动控制隔震系统对近断层地震的放大效应,限制隔震层的位移。
Conventional isolation systems may induce an excessive response in near-fault earthquakes.A new short time Fourier transformation(STFT) control algorithm for Variable Friction Dampers(VFD) was developed to improve the performance of base isolation buildings in near-fault earthquakes.The STFT controller varied the clamping force in the VFD damper to achieve the response reduction.In addition,the STFT algorithm was implemented analytically on a Multi Degree of Freedom System(MDOF) with laminated rubber bearings and variable friction dampers in Simulink environment.Three types of earthquakes representing a wide variety of ground motions were considered as the ground excitations in the simulation.The numerical results showed that,compared with conventional isolation systems,the semi-active isolation system controlled by the STFT algorithm can reduce the excessive response in near-fault earthquakes effectively.
Conventional isolation systems may induce an excessive response in near-fault earthquakes.A new short time Fourier transformation(STFT) control algorithm for Variable Friction Dampers(VFD) was developed to improve the performance of base isolation buildings in near-fault earthquakes.The STFT controller varied the clamping force in the VFD damper to achieve the response reduction.In addition,the STFT algorithm was implemented analytically on a Multi Degree of Freedom System(MDOF) with laminated rubber bearings and variable friction dampers in Simulink environment.Three types of earthquakes representing a wide variety of ground motions were considered as the ground excitations in the simulation.The numerical results showed that,compared with conventional isolation systems,the semi-active isolation system controlled by the STFT algorithm can reduce the excessive response in near-fault earthquakes effectively.
引文
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[13]Clough R,Penzien J.结构动力学[M].王光远,等译校.北京:高等教育出版社,2010.Clough R,Penzien J.Dynamics of Structure[M].Beijing:Higher Education Press,2010.(in Chinese)
[2]周福霖.工程结构减震控制[M].北京:中国地震出版社,1997.
[3]黄海荣,朱玉华.基础隔震结构反应谱研究[J].土木工程学报,2010,26(3):123-129.Huang H R,Zhu Y H.Studies on design responsespectrum for base-isolated structures[J].StructuralEngineerings,2010,26(3):123-129.(in Chinese)
[4]Dicleli M.Performance of Seismic Isolated Bridges inRelation to Near Fault Gound Motion and IsolatorCharacteristics[J].Earthquake Spectra,2010,22:887-907.
[5]Jangid R S.Kelly J M.Base isolation for near-faultmotion[J].Earthquake Engineering and StructuralDynamics,1995,30:691-707.
[6]Loh L Y,Wu T C,Huang N E.Application of theempirical mode decomposition-hilbert spectrummethod to identify near-fault ground-motioncharacteristics[J].Bulletin of the SeismologicalSociety of America,2001,91:1339-1357.
[7]Guan X C,Dong X F,Ou J P.Magnetostrictive effectof magnetorheological elastomer[J].Journal ofMagnetism and Magnetic Materials,2008,320:158-163.
[8]Nagarajaiah S,Sahasrabudhe S.Seismic responsecontrol of smart sliding isolated building using variablestiffness systems:an experimental and numerical study[J].Journal of Structural Control and HealthMonitoring,2006,13:573-588.
[9]欧进萍,杨飚.压电T型变摩擦阻尼器及其性能试验分析[J].地震工程与工程振动,2003,23(4):171-176.Ou J P,Yang Y.Piezoelectric-T shape variablefriction damper and its performance tests and analysis[J].Earthquake Engineering and EngineeringVibration,2003,23(4):171-176.(in Chinese)
[10]Lu L Y,Lin G L.Fuzzy friction controllers for semi-active seismic isolation systems[J].Journal ofIntelligent Material Systems and Structures,2009,20:1747-1770.
[11]Xu Y L,Qu W L.Control of wind-excited truss towerusing semi-active friction damper[J].Journal ofStructural Engineering,ASCE,2001,127:861-868.
[12]Narasimhan S,Nagarajaiah S.A STFT semi-activecontroller for base isolated buildings with variablestiffness isolation systems[J].Engineering Structure,2005,27:514-523.
[13]Clough R,Penzien J.结构动力学[M].王光远,等译校.北京:高等教育出版社,2010.Clough R,Penzien J.Dynamics of Structure[M].Beijing:Higher Education Press,2010.(in Chinese)
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