用位移反应谱研究长周期设计地震反应谱
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摘要
利用美国太平洋地震工程研究中心NGA数据库,分析了滤波低频截止周期(Tc)对位移反应谱的影响。选择较小的Tc将严重抑制长周期位移反应谱幅值。本文选用可靠使用周期不小于10 s的强地面运动加速度记录,研究了位移反应谱的长周期特性。结果表明,位移反应谱峰点周期是长周期地震反应谱的关键控制参数,受场地条件和震级的影响相对较小,但与震中距基本呈线性增长关系,而动力放大系数最大值波动范围较小,设计中可视为常数。建议在现行抗震设计规范谱的基础上,在速度控制段与位移控制段之间增加一个过渡段,以体现位移反应谱的有峰特征,并给出了控制参数的建议值。
The effect of the long-period filter cut-off,Tc,on spectral displacements is analysed using the NGA database of the Pacific Earthquake Engineering Research Center.Long-period spectral displacements would be suppressed badly,if a short Tc is chosen.Strong ground motion accelerograms with reliable period up to at least 10s are selected to investigate the characteristics of displacement response spectra at long periods.The results indicate that the period,in which the spectral displacement culminates,is a significant parameter to control long-period spectral ordinates.This parameter can't be affected obviously by site condition and magnitude,but greatly depends on epicentral distance with linear relation.The maximum amplification factor of displacement spectrum fluctuates slightly,and can be treated as a constant.A transition region is suggested to insert between velocity-sensitive region and displacement-sensitive region to fit for displacement spectrum,and the values of some parameters are proposed in this paper.
The effect of the long-period filter cut-off,Tc,on spectral displacements is analysed using the NGA database of the Pacific Earthquake Engineering Research Center.Long-period spectral displacements would be suppressed badly,if a short Tc is chosen.Strong ground motion accelerograms with reliable period up to at least 10s are selected to investigate the characteristics of displacement response spectra at long periods.The results indicate that the period,in which the spectral displacement culminates,is a significant parameter to control long-period spectral ordinates.This parameter can't be affected obviously by site condition and magnitude,but greatly depends on epicentral distance with linear relation.The maximum amplification factor of displacement spectrum fluctuates slightly,and can be treated as a constant.A transition region is suggested to insert between velocity-sensitive region and displacement-sensitive region to fit for displacement spectrum,and the values of some parameters are proposed in this paper.
引文
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[17]李恒,秦小军.竖向与水平向地震动加速度反应谱比特性分析[J].地震工程与工程振动,2010,30(1):8-14.LI Heng,QIN Xiaojun.Study on characteristics of vertical to horizontal acceleration response spectral ratio[J].Journal of Earthquake Engineeringand Engineering Vibration,2010,30(1):8-14.(in Chinese)
[18]曹加良,施卫星,刘文广,等.长周期结构相对位移反应谱研究[J].振动与冲击,2011,30(7):63-70.CAO Jialiang,SHI Weixing,LIU Wenguang,et al.Relative displacement response spectrum of a long-period structure[J].Journal of Vibrationand Shock,2011,30(7):63-70.
[19]Vuan A,Klin P,Laurenzano G,et al.Far-source long-period displacement response spectra in the po and venetian Plains(Italy)from 3D wave-field simulations[J].Bulletin of the Seismological Society of America,2011,101(3):1055-1072.
[20]Newmark N M,Hall W J.Earthquake spectra and design[M].Earthquake Engineering Research Institute,Berkeley,Calif.,1982:35-36.
[2]俞言祥.长周期地震动研究综述[J].国际地震动态,2004,307(7):1-5.YU Yanxiang.Review of long period ground motion study[J].Recent Developments in World Seismology,2004,307(7):1-5.(in Chinese)
[3]中华人民共和国交通运输部.JTGT B02-01-2008公路桥梁抗震设计细则[S].北京:人民交通出版社,2008.Ministry of Transport of the People's Republic of China.JTGT B02-01-2008 Guidelines for Seismic Design of Highway Bridges[S].Beijing:Chi-na Communications Press,2008.(in Chinese)
[4]Hiroshi Kuramoto.Seismic Design Codes for Buildings in Japan[J].Journal of Disaster Research,2006,1(3):341-356.
[5]中华人民共和国建设部.GB50267-97核电厂抗震设计规范[S].北京:中国计划出版社,1998.Ministry of Construction of the People's Republic of China.GB 50267-97 Code for Seismic Design of Nuclear Power Plants[S].Beijing:ChinaPlanning Press,1998.(in Chinese)
[6]国家石油和化学工业局.SH3048-1999石油化工钢制设备抗震设计规范[S].北京:中国石化出版社,1999.State Bureau of Petroleum and Chemical Industry.SH3048-1999 Seismic Design Specification for Petrochemical Steel Facilities[S].Beijing:Chi-na Petrochemical Press,1999.(in Chinese)
[7]Building Seismic Safety Council.2003 Edition NEHRP Recommended Provision for the Development of Seismic Regulations for New Buildings andOther Structures[S].Developed for Federal Emergency Management Agency,Washington,DC,2004.
[8]European Committee for Standardization.Eurocode 8:Design of Structures for Earthquake Resistance[S].2003.
[9]中华人民共和国建设部.GB50111-2010建筑抗震设计规范[S].北京:中国建筑工业出版社,2010.Ministry of Construction of the People's Republic of China.GB 50111-2010 Code for Seismic Design of Buildings[S].Beijing:China Architecture&Building Press,2010.(in Chinese)
[10]项海帆,陈国强.规范化的人工地震波[J].同济大学学报,1985(4):1-12.XIANG Haifan,CHEN Guoqiang.Standardization of the artificial acceleration time-histories[J].Journal of Tongji University,1985(4):1-12.(in Chinese)
[11]王亚勇,王理,刘小弟.不同阻尼比长周期抗震设计反应谱研究[J].工程抗震,1990(6):38-41.WANG Yayong,WANG Li,LIU Xiaodi.Study on the long-period seismic design response spectrum of different damping ratios[J].EarthquakeResistant Engineering,1990,(6):38-41.(in Chinese)
[12]王君杰,范立础.规范反应谱长周期部分修正方法的探讨[J].土木工程学报,1998,31(6):49-55.WANG Junjie,FAN Lichu.Modification of code response spectrum in long-period phase[J].China Civil Engineering Journal,1998,31(6):49-55.(in Chinese)
[13]Boore D M.Effect of baseline corrections on displacements and response spectra for several recordings of the 1999 Chi-Chi,Taiwan,earthquake[J].Bulletin of the Seismological Society of America,2001,91(5):1199-1211.
[14]Faccioli E,Paolucci R,Rey J.Displacement spectra for long periods[J].Earthquake Spectra,2004,20:347-376.
[15]Paolucci R,Rovelli A,et al.On the reliability of long-period response spectral ordinates from digital accelerograms[J],Earthquake Engineer-ing and Structural Dynamics,2008,37:697-710.
[16]Akkar S,Bommer JJ.Influence of long-period filter cut-off on elastic spectral displacements[J],Earthquake Engineering and Structural Dy-namics,2006,35:1145-1165.
[17]李恒,秦小军.竖向与水平向地震动加速度反应谱比特性分析[J].地震工程与工程振动,2010,30(1):8-14.LI Heng,QIN Xiaojun.Study on characteristics of vertical to horizontal acceleration response spectral ratio[J].Journal of Earthquake Engineeringand Engineering Vibration,2010,30(1):8-14.(in Chinese)
[18]曹加良,施卫星,刘文广,等.长周期结构相对位移反应谱研究[J].振动与冲击,2011,30(7):63-70.CAO Jialiang,SHI Weixing,LIU Wenguang,et al.Relative displacement response spectrum of a long-period structure[J].Journal of Vibrationand Shock,2011,30(7):63-70.
[19]Vuan A,Klin P,Laurenzano G,et al.Far-source long-period displacement response spectra in the po and venetian Plains(Italy)from 3D wave-field simulations[J].Bulletin of the Seismological Society of America,2011,101(3):1055-1072.
[20]Newmark N M,Hall W J.Earthquake spectra and design[M].Earthquake Engineering Research Institute,Berkeley,Calif.,1982:35-36.
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