基于性能抗震设计中的等效线性模型研究
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摘要
对6种等效线性化方法等效模型进行分析和总结,研究等效线性化方法应用于桥梁结构基于位移抗震设计的可行性及计算过程。以箍筋体积配箍率和桥梁结构承载能力为评价因素,对钢筋混凝土桥梁墩柱采用不同等效线性化方法进行基于位移的抗震设计,研究了等效线性化方法及阻尼调整系数对抗震设计结果的影响。研究表明,各种等效线性化方法应用于基于位移的抗震设计其计算结果存在较大差异,等效阻尼比对基于位移的抗震设计结果影响显著,不同的阻尼调整系数得到的计算结果也不同。在所研究的6种等效线性化方法中,Kowalsky方法、Iwan方法和欧进萍方法计算误差较小,随着位移延性系数的增大,Kowalsky方法的计算误差减小。应用Eurocode8规范提供的阻尼调整系数计算得到的结果与真实值较为接近。建议采用Eurocode8规范提供的阻尼调整系数和Kowalsky方法进行基于位移的抗震设计。
Six equivalent linearization methods are summarized and the calculation process for applying these methods to displacement-based design of bridge engineering is studied.With the evaluation of volume stirrup ratio and safety performance of design structure,these methods are used in displacement-based design of bridge columns.The influence of equivalent linearization model and damping adjustment coefficient on seismic design results is studied.The results show that there are big differences among the seismic design results based on different equivalent linearization methods.The equivalent damping ratio model and the damping adjustment coefficient have great influence on seismic design results.Calculation errors of Kowalsky method,Iwan method and Ou method are very small.The calculation error of Kowalsky method decrease when the displacement ductility factor increases.The calculated results based on the damping adjustment coefficient provided by Eurocode8 specification is more close to the real one.The Kowalsky method and the damping adjustment coefficient of Eurocode8 specification are recommended to be used in displacement-based design of bridge engineering.
Six equivalent linearization methods are summarized and the calculation process for applying these methods to displacement-based design of bridge engineering is studied.With the evaluation of volume stirrup ratio and safety performance of design structure,these methods are used in displacement-based design of bridge columns.The influence of equivalent linearization model and damping adjustment coefficient on seismic design results is studied.The results show that there are big differences among the seismic design results based on different equivalent linearization methods.The equivalent damping ratio model and the damping adjustment coefficient have great influence on seismic design results.Calculation errors of Kowalsky method,Iwan method and Ou method are very small.The calculation error of Kowalsky method decrease when the displacement ductility factor increases.The calculated results based on the damping adjustment coefficient provided by Eurocode8 specification is more close to the real one.The Kowalsky method and the damping adjustment coefficient of Eurocode8 specification are recommended to be used in displacement-based design of bridge engineering.
引文
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[8]Iwan W D,Gates N C.Estimating earthquake response of simple hysteretic structures[J].Journal of the Engineering Mechanics Division,ASCE,1979,105(3):391-405.
[9]欧进萍,吴斌,龙旭.耗能减振结构的抗震设计方法[J].地震工程与工程振动,1998,18(2):98-107.OU Jinping,WU Bin,LONG Xu.Aseismic design methods of passive energy dissipation systems[J].Journal of Earthquake Engineering and Engi-neering Vibration,1998,18(2):98-107.(in Chinese)
[10]Eurocode8.Design provisions for earthquake resistance of structures[S].Brussels:European Committee for Standardization,1994.
[11]中华人名共和国交通运输部.JTGTB02-01-2008公路桥梁抗震设计细则[S].北京:人民交通出版社,2008.P.R.China.Ministry of Transport.JTG/T B02-01-2008Chinese Specification of Guidelines for Seismic Design of Highway Bridges[S].2008.(in Chinese)
[12]周道传,陈国荣,聂利英.以位移为基础的钢筋混凝土桥梁墩柱抗震设计方法研究[J].公路交通科技,2009,26(10):87-92,99.ZHOU Daochuan,CHEN Guorong,NIE Liying.Study of displacement-based seismic design method for RC bridge Piers[J].Journal of Highway and Transportation Research and Development,2009,26(10):87-92,99.(in Chinese)
[2]Shimazaki K,Sozen M A.Seismic drift of reinforced concrete structures[].Special Research Paper.Tokyo:1985.
[3]Kowalsky M J,Priestley M J N,Maerae G A.Displacement-based design of RC bridge columns in seismic regions[J].Earthquake Engineering and Structural Dynamics,1995,24(12):1623-1643.
[4]Kowalsky M J.Deformation limit states for circular reinforced concrete bridge columns[J].Journal of Structural Engineering ASCE,2000,126(8):869-878.
[5]American Association of State Highway and Transportation Officials.Standard Specifications for Highway Bridges,DivisionⅠ-A Seismic Design[S].Sixteenth Edition,1996.
[6]Iwan W D.Estimating inelastic response spectra from elastic spectra[J].Earthquake Engineering and Structural Dynamics,1980,8(4):375-388.
[7]Hwang J S.Evaluation of equivalent linear analysis methods of bridge Isolation[J].Journal of Structural Engineering,ASCE,1996,122(8):872-976.
[8]Iwan W D,Gates N C.Estimating earthquake response of simple hysteretic structures[J].Journal of the Engineering Mechanics Division,ASCE,1979,105(3):391-405.
[9]欧进萍,吴斌,龙旭.耗能减振结构的抗震设计方法[J].地震工程与工程振动,1998,18(2):98-107.OU Jinping,WU Bin,LONG Xu.Aseismic design methods of passive energy dissipation systems[J].Journal of Earthquake Engineering and Engi-neering Vibration,1998,18(2):98-107.(in Chinese)
[10]Eurocode8.Design provisions for earthquake resistance of structures[S].Brussels:European Committee for Standardization,1994.
[11]中华人名共和国交通运输部.JTGTB02-01-2008公路桥梁抗震设计细则[S].北京:人民交通出版社,2008.P.R.China.Ministry of Transport.JTG/T B02-01-2008Chinese Specification of Guidelines for Seismic Design of Highway Bridges[S].2008.(in Chinese)
[12]周道传,陈国荣,聂利英.以位移为基础的钢筋混凝土桥梁墩柱抗震设计方法研究[J].公路交通科技,2009,26(10):87-92,99.ZHOU Daochuan,CHEN Guorong,NIE Liying.Study of displacement-based seismic design method for RC bridge Piers[J].Journal of Highway and Transportation Research and Development,2009,26(10):87-92,99.(in Chinese)
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