阻尼比对强度折减系数的影响
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摘要
为了考虑不同阻尼比对强度折减系数的影响,通过弹塑性动力时程分析,采用424条国内外的地震波记录,运用理想弹塑性双线性模型对阻尼比为0.01到0.10的不同体系进行计算分析。结果表明阻尼比对强度折减系数的影响比较显著。其中周期对阻尼比影响系数Rξ的影响较大,延性和场地土类别等条件对阻尼比影响系数Rξ的影响较小,并就不同阻尼比对强度折减系数的影响作了拟合。可为抗震设计提供有益的参考。
In order to consider the different damping influence on strength-reduction factor,the paper makes the computational analyses on the different damping ratio system of 0.01-0.10 by employing a total of 424 seismic waves,the nonlinear time-history dynamic analysis and the perfectly elastoplatic bilinear model.The results demonstrate that the effect of damping ratio on strength-reduction factor is obvious,the period greatly influences the damping ratio influence factor Rξ,whereas the effect of ductility and soil condition is slight.In the paper,considering the influence of different damping on strength-reduction factor,a fitting expression is obtained.The results will provide a valuable reference to the seismic design.
In order to consider the different damping influence on strength-reduction factor,the paper makes the computational analyses on the different damping ratio system of 0.01-0.10 by employing a total of 424 seismic waves,the nonlinear time-history dynamic analysis and the perfectly elastoplatic bilinear model.The results demonstrate that the effect of damping ratio on strength-reduction factor is obvious,the period greatly influences the damping ratio influence factor Rξ,whereas the effect of ductility and soil condition is slight.In the paper,considering the influence of different damping on strength-reduction factor,a fitting expression is obtained.The results will provide a valuable reference to the seismic design.
引文
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[2]Krawinkler H,Nassar A A.Seismic design based on ductility and cumulative damagedemand and capacities,Nonlinear Seismic Analysis andDesign of Reinforced Concrete Buildings[C].Fajfar and Krawinkler,ed.Elsevier Applied Science.New York,USA,1992:23-40.
[3]Miranda E.Site-dependent strength-reduction factors[J],Journal of Structural Engineering,1993,119(12):3503-3519.
[4]Miranda E,Bertero V V.Evaluation of strength reduction factor for earthquake-resistance design[J].Earthquake Spectra,1994,l0(2):357-379.
[5]Vidic T,Fajfar P,Fischinger M.Consistent inelastic design spectra:strength and displacement[J].Earthquake Engineering and Structural Dynam-ics,1994,23(3):507-521.
[6]Borzi B,Elnashai A S.Refined force reduction factors for seismic design[J].Engineering Structures,2000,22(10):1244-1260.
[7]卓卫东,范立础.结构抗震设计中的强度折减系数研究[J].地震工程与工程振动,2001,21(1):84-88.
[8]翟长海,公茂盛,张茂花,等.工程结构等延性地震抗力谱研究[J].地震工程与工程振动,2004,24(1):22-29.
[9]吕西林,周定松.考虑场地类别与设计分组的延性需求谱和弹塑性位移反应谱[J].地震工程与工程振动,2004,24(1):39-48.
[10]Eurcode 8:Design of structures for earthquake resistance[S].Brussels,CEN,2003.
[11]NZS4203.General Structural Design Loading For Building[S].Wellington,New Zealand,1992.
[12]Borzi B,Elnashai A S.Refined force reduction factors for seismic design[J].Engineering Structures,2000,22:1244-1260.
[13]李国强,李杰,苏小卒.建筑结构抗震设计[M].北京:中国建筑工业出版社,2002.
[14]GB50011-2001,建筑抗震设计规范[S].
[15]赵永锋,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.
[2]Krawinkler H,Nassar A A.Seismic design based on ductility and cumulative damagedemand and capacities,Nonlinear Seismic Analysis andDesign of Reinforced Concrete Buildings[C].Fajfar and Krawinkler,ed.Elsevier Applied Science.New York,USA,1992:23-40.
[3]Miranda E.Site-dependent strength-reduction factors[J],Journal of Structural Engineering,1993,119(12):3503-3519.
[4]Miranda E,Bertero V V.Evaluation of strength reduction factor for earthquake-resistance design[J].Earthquake Spectra,1994,l0(2):357-379.
[5]Vidic T,Fajfar P,Fischinger M.Consistent inelastic design spectra:strength and displacement[J].Earthquake Engineering and Structural Dynam-ics,1994,23(3):507-521.
[6]Borzi B,Elnashai A S.Refined force reduction factors for seismic design[J].Engineering Structures,2000,22(10):1244-1260.
[7]卓卫东,范立础.结构抗震设计中的强度折减系数研究[J].地震工程与工程振动,2001,21(1):84-88.
[8]翟长海,公茂盛,张茂花,等.工程结构等延性地震抗力谱研究[J].地震工程与工程振动,2004,24(1):22-29.
[9]吕西林,周定松.考虑场地类别与设计分组的延性需求谱和弹塑性位移反应谱[J].地震工程与工程振动,2004,24(1):39-48.
[10]Eurcode 8:Design of structures for earthquake resistance[S].Brussels,CEN,2003.
[11]NZS4203.General Structural Design Loading For Building[S].Wellington,New Zealand,1992.
[12]Borzi B,Elnashai A S.Refined force reduction factors for seismic design[J].Engineering Structures,2000,22:1244-1260.
[13]李国强,李杰,苏小卒.建筑结构抗震设计[M].北京:中国建筑工业出版社,2002.
[14]GB50011-2001,建筑抗震设计规范[S].
[15]赵永锋,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.
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