结构弹塑性等效线性化方法的研究
|
摘要
等效线性化方法是估算结构最大弹塑性反应的实用化方法。等效线性化方法中,体系等效周期和等效阻尼比被视为位移延性系数的函数,把弹塑性体系等效为弹性体系来进行时程分析并求出结构最大反应。通过列举7种等效线性化方法——割线刚度法、平均刚度和能量法、平均刚度和阻尼法、Iwan方法、Hwang方法、Kowalsky方法、Iwan和Guyader方法,选取59个结构周期控制点、32条地震波,共进行了26432次弹塑性和等效线弹性时程分析。对每种等效方法的精度以及适用范围进行了对比和讨论,提出了选取等效线性化方法的建议。
Equivalent linearization methods are the practical methods to estimate the maximum inelastic response of structures.In the equivalent linearization methods,equivalent period and equivalent damping ratio of the system are computed as a function of the displacement ductility ratio,then an inelastic system is equaled to a linear elastic system and the maximum inelastic response are computed through time history analysis.Seven equivalent linearization methods are presented—secant stiffness method,the method based on the average stiffness and energy,the method based on the average stiffness and damping,the method by Iwan,the method by Hwang,the method by Kowalsky,the method by Iwan and Guyader,59 periods of structrues and 32 seismic waves are selected,26432 inelastic and equivalent linear elastic time history analyses are proceeded.Computation precision and applicability are compared and discussed for each method,and suggestions for selecting the equivalent linearization methods are presented.
Equivalent linearization methods are the practical methods to estimate the maximum inelastic response of structures.In the equivalent linearization methods,equivalent period and equivalent damping ratio of the system are computed as a function of the displacement ductility ratio,then an inelastic system is equaled to a linear elastic system and the maximum inelastic response are computed through time history analysis.Seven equivalent linearization methods are presented—secant stiffness method,the method based on the average stiffness and energy,the method based on the average stiffness and damping,the method by Iwan,the method by Hwang,the method by Kowalsky,the method by Iwan and Guyader,59 periods of structrues and 32 seismic waves are selected,26432 inelastic and equivalent linear elastic time history analyses are proceeded.Computation precision and applicability are compared and discussed for each method,and suggestions for selecting the equivalent linearization methods are presented.
引文
[1]Akkar S D,Miranda E.Statistical evaluation of approximate meth-ods for estimating maximum deformation demands on existing struc-trues[J].Journal of Structural Engineering,ASCE,2005,131(1):160-172.
[2]李妍,吴斌,欧进萍.弹塑性结构等效线性化方法的对比研究[J].工程抗震与加固改造,2005,27(1):1-6.
[3]Rosenblueth E,Herrera I.On a kind of hysteretic damping[J].Journal of Engineering Mechanics Division,ASCE,l964,90(1):37-48.
[4]Iwan W D,Gates N C.Estimating earthquake response of simplehysteretic structures[J].Journal of the Engineering Mechanics Di-vesion,ASCE,1979,105(3):391-405.
[5]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.
[6]Miranda E,Jorge R G.Evaluation of approximate methods to esti-mate maximum inelastic displacement demands[J].EarthquakeEngineering and Structural Dynamics,2002,31(3):539-560.
[7]Hwang J S.Evaluation of equivalent linear analysis methods ofbridge isolation[J].Journal of Structural Engineering,ASCE,1996,122(8):872-976.
[8]陈贡联.基于性能目标的反应谱研究[D].青岛:青岛理工大学,2006.
[2]李妍,吴斌,欧进萍.弹塑性结构等效线性化方法的对比研究[J].工程抗震与加固改造,2005,27(1):1-6.
[3]Rosenblueth E,Herrera I.On a kind of hysteretic damping[J].Journal of Engineering Mechanics Division,ASCE,l964,90(1):37-48.
[4]Iwan W D,Gates N C.Estimating earthquake response of simplehysteretic structures[J].Journal of the Engineering Mechanics Di-vesion,ASCE,1979,105(3):391-405.
[5]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.
[6]Miranda E,Jorge R G.Evaluation of approximate methods to esti-mate maximum inelastic displacement demands[J].EarthquakeEngineering and Structural Dynamics,2002,31(3):539-560.
[7]Hwang J S.Evaluation of equivalent linear analysis methods ofbridge isolation[J].Journal of Structural Engineering,ASCE,1996,122(8):872-976.
[8]陈贡联.基于性能目标的反应谱研究[D].青岛:青岛理工大学,2006.
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心