考虑土-结构相互作用的结构延性折减系数分析
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摘要
结构延性折减系数是抗震设计中把弹性抗震强度需求折减到弹塑性设计水准的关键参数。本文通过单自由度体系的非线性时程分析,定性研究了土-结构相互作用对抗震延性折减系数的影响。分析结果表明,土-结构的相互作用对结构抗震延性折减系数有很大的影响,无量纲频率系数和结构高宽比越大影响越显著,考虑土-结构相互作用的结构体系比假定基础固接的结构体系的延性需求大。
Structure ductility reduction factor is a key parameter to reduce elastic seismic strength demand to arrive at the design level in building seismic design.Based on the nonlinear time-history analysis of single-degree-of-freedom systems subjected to earthquake ground motions,the effect of soil-structure interaction on the ductility reduction factor is qualitatively investigated in this paper.The results show that the effect of soil-structure interaction is distinct.Commonly the effect increases with the increasing the non-dimensional frequency factor and aspect ratio of the system.The soil-structure system needs much higher ductility demand comparing with the assumed fixed-based system.
Structure ductility reduction factor is a key parameter to reduce elastic seismic strength demand to arrive at the design level in building seismic design.Based on the nonlinear time-history analysis of single-degree-of-freedom systems subjected to earthquake ground motions,the effect of soil-structure interaction on the ductility reduction factor is qualitatively investigated in this paper.The results show that the effect of soil-structure interaction is distinct.Commonly the effect increases with the increasing the non-dimensional frequency factor and aspect ratio of the system.The soil-structure system needs much higher ductility demand comparing with the assumed fixed-based system.
引文
[1]Newmark N M,Hall W J.Procedures and criteria forearthquake resistant design[R].Building Research SeriesNo.46,National Bureau of Standards,U.S.Department ofCommerce,Washington,D.C,1973
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[3]Elghadamsi F E,Mohraz B.Inelastic earthquake spectra[J].Earthquake Engineering and Structural Dynamics,1987,15(2):91～104
[4]Lee L H,Han S W,Oh Y H.Determination of ductilityfactor considering different hysteretic models[J].Earthquake Engineering and Structural Dynamics,1999,28(9):957～977
[5]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
[6]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
[7]瞿长海,公茅盛,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
[8]周靖,蔡健,方小丹.钢筋混凝土结构抗震强度折减系数谱分析[J].华南理工大学学报,2006,26(2):100～105
[9]Aviles J,Perez-Rocha L.Soil structure interaction inyielding systems[J].Earthquake Engineering and StructuralDynamics,2003,32(11):1749～1771
[10]Ghannad M A,Jahankhah H.Strength reduction factorsconsidering soil-structure interaction[A].Paper No.2331,13thWorld Conference on Earthquake Engineering[C],Vancouver,B.C,Canada,2004
[2]Nassar A,Krawinkler H.Seismic demands for SDOF andMDOF systems[R].Report No.95,the John A.BlumeEarthquake Engineering Center,Stanford University,Stanford,California,1991
[3]Elghadamsi F E,Mohraz B.Inelastic earthquake spectra[J].Earthquake Engineering and Structural Dynamics,1987,15(2):91～104
[4]Lee L H,Han S W,Oh Y H.Determination of ductilityfactor considering different hysteretic models[J].Earthquake Engineering and Structural Dynamics,1999,28(9):957～977
[5]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
[6]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
[7]瞿长海,公茅盛,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
[8]周靖,蔡健,方小丹.钢筋混凝土结构抗震强度折减系数谱分析[J].华南理工大学学报,2006,26(2):100～105
[9]Aviles J,Perez-Rocha L.Soil structure interaction inyielding systems[J].Earthquake Engineering and StructuralDynamics,2003,32(11):1749～1771
[10]Ghannad M A,Jahankhah H.Strength reduction factorsconsidering soil-structure interaction[A].Paper No.2331,13thWorld Conference on Earthquake Engineering[C],Vancouver,B.C,Canada,2004
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