地震动持时效应对阻尼折减系数的影响
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摘要
阻尼折减系数是建筑抗震设计中确定设计地震作用的重要参数之一。该文采用简谐正弦波和25条集集地震记录,基于单自由度体系不同阻尼比水平的位移反应谱研究了有效地震动持时对阻尼折减系数影响。分析结果表明:阻尼折减系数随有效地震动持时比和简谐激励循环数的增加而减小。基于分析结果的统计平均值,通过非线性多元回归分析给出了考虑地震动持时影响的阻尼折减系数谱。
Damping reduction factor is one of the important parameters to determine the design earthquake force for building’s structural seismic design. Employing the displacement response spectra of single-degree-of freedom systems with different levels of damping ratios, the present study investigates the effects of the effective ground motion duration on damping reduction factor. The ground motion durations are associated with 25 Chi-chi earthquake records and harmonic sine wave. The study shows that damping reduction factor decreases with the increasing of the effective duration of the ground motion and the number of cycles of harmonic excitation. A nonlinear multiple regression analysis based on the statistical mean value of the present study is employed, and a modified damping reduction factor considering the effects of ground motion duration is suggested.
Damping reduction factor is one of the important parameters to determine the design earthquake force for building’s structural seismic design. Employing the displacement response spectra of single-degree-of freedom systems with different levels of damping ratios, the present study investigates the effects of the effective ground motion duration on damping reduction factor. The ground motion durations are associated with 25 Chi-chi earthquake records and harmonic sine wave. The study shows that damping reduction factor decreases with the increasing of the effective duration of the ground motion and the number of cycles of harmonic excitation. A nonlinear multiple regression analysis based on the statistical mean value of the present study is employed, and a modified damping reduction factor considering the effects of ground motion duration is suggested.
引文
[1]Lin Y Y,Chang K C.Study on damping reduction factor for buildings under earthquake ground motions[J].Journal of Structural Engineering,2003,129(2):206―214.
[2]Newmark N M,Hall W J.Earthquake spectra and design[R].Oakland:Earthquake Engineering Research Institute,CA,1982.
[3]Ashour S A.Elastic seismic response of buildings with supplemental damping[D].Michigan:University of Michigan,USA,1987.
[4]Wu J P,Hanson R D.Inelastic response spectra with high damping[J].Journal of the Structural Division(ASCE),1989,115(6):1412―1431.
[5]Ramirez O M,Constantinou M C,Whittaker A S.Elastic and inelastic seismic response of buildings with damping systems[J].Earthquake Spectra,2002,18(3):531―547.
[6]赵永峰,童根树.修正Clough滞回模型下的地震力调整系数[J].土木工程学报,2006,39(10):34―41.Zhao Yongfeng,Tong Genshu.Seismic force modification factors for structures with modified-Clough hysteretic model[J].China Civil Engineering Journal,2006,39(10):34―41.(in Chinese)
[7]Lin Y Y,Chang K C.Effects of site classes on damping reduction factor[J].Journal of Structural Engineering,2004,130(11):1667―1675.
[8]Bommer J J,Mendis R.Scaling of spectral displacement ordinates with damping ratios[J].Earthquake Engineering and Structural Dynamics,2005,34(2):145―165.
[9]Hancock J,Bommer J J.A state-of-knowledge review of the influence of strong-motion duration on structural damage[J].Earthquake Spectra,2006,22(3):827―845.
[10]Pacific Earthquake Engineering Research Center.PEER strong ground motion database[DB].http://peer.berkeley.edu/smcat/search.html,2007-10-11.
[11]Trifunac M D,Brady A G.A Study on the duration of strong earthquake ground motion[J].Bulletin of the Seismological Society of America,1975,65(3):581―626.
[12]SeismoSoft.SeismoSignal-A computer program for signal processing of strong-motion data[CP].Pacific Earthquake Engineering Research Center,http://www.seismosoft.com,2007-10-11.
[13]Hachem M M.Bispec help manual[EB].University of California,Berkeley,http://www.ce.berkeley.edu/～hachem,2007-10-11.
[14]Chai Y H.Incorporating low-cycle fatigue model into duration-dependent inelastic design spectra[J].Earthquake Engineering and Structural Dynamics,2005,34(1):83―96.
[15]陶能付,章在墉.地震动持续时间在抗震设计中的应用[J].同济大学学报,1996,24(4):374―379.Tao Nengfu,Zhang Zaiyong.Application of ground motion duration to seismic design[J].Journal of Tongji University,1996,24(4):374―379.(in Chinese)
[16]盛明强,罗奇峰,刘建成.考虑场地类别与强震持时的滞回耗能谱的特征分析[J].地震研究,2007,30(2):167―174.Sheng Mingqiang,Luo Qifeng,Liu Jiancheng.Hysteretic energy spectra considering site type and duration of strong ground motion[J].Journal of Seismological Research,2007,30(2):167―174.(in Chinese)
[2]Newmark N M,Hall W J.Earthquake spectra and design[R].Oakland:Earthquake Engineering Research Institute,CA,1982.
[3]Ashour S A.Elastic seismic response of buildings with supplemental damping[D].Michigan:University of Michigan,USA,1987.
[4]Wu J P,Hanson R D.Inelastic response spectra with high damping[J].Journal of the Structural Division(ASCE),1989,115(6):1412―1431.
[5]Ramirez O M,Constantinou M C,Whittaker A S.Elastic and inelastic seismic response of buildings with damping systems[J].Earthquake Spectra,2002,18(3):531―547.
[6]赵永峰,童根树.修正Clough滞回模型下的地震力调整系数[J].土木工程学报,2006,39(10):34―41.Zhao Yongfeng,Tong Genshu.Seismic force modification factors for structures with modified-Clough hysteretic model[J].China Civil Engineering Journal,2006,39(10):34―41.(in Chinese)
[7]Lin Y Y,Chang K C.Effects of site classes on damping reduction factor[J].Journal of Structural Engineering,2004,130(11):1667―1675.
[8]Bommer J J,Mendis R.Scaling of spectral displacement ordinates with damping ratios[J].Earthquake Engineering and Structural Dynamics,2005,34(2):145―165.
[9]Hancock J,Bommer J J.A state-of-knowledge review of the influence of strong-motion duration on structural damage[J].Earthquake Spectra,2006,22(3):827―845.
[10]Pacific Earthquake Engineering Research Center.PEER strong ground motion database[DB].http://peer.berkeley.edu/smcat/search.html,2007-10-11.
[11]Trifunac M D,Brady A G.A Study on the duration of strong earthquake ground motion[J].Bulletin of the Seismological Society of America,1975,65(3):581―626.
[12]SeismoSoft.SeismoSignal-A computer program for signal processing of strong-motion data[CP].Pacific Earthquake Engineering Research Center,http://www.seismosoft.com,2007-10-11.
[13]Hachem M M.Bispec help manual[EB].University of California,Berkeley,http://www.ce.berkeley.edu/～hachem,2007-10-11.
[14]Chai Y H.Incorporating low-cycle fatigue model into duration-dependent inelastic design spectra[J].Earthquake Engineering and Structural Dynamics,2005,34(1):83―96.
[15]陶能付,章在墉.地震动持续时间在抗震设计中的应用[J].同济大学学报,1996,24(4):374―379.Tao Nengfu,Zhang Zaiyong.Application of ground motion duration to seismic design[J].Journal of Tongji University,1996,24(4):374―379.(in Chinese)
[16]盛明强,罗奇峰,刘建成.考虑场地类别与强震持时的滞回耗能谱的特征分析[J].地震研究,2007,30(2):167―174.Sheng Mingqiang,Luo Qifeng,Liu Jiancheng.Hysteretic energy spectra considering site type and duration of strong ground motion[J].Journal of Seismological Research,2007,30(2):167―174.(in Chinese)
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