近断层地震动对钢筋混凝土框架结构地震反应的影响
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摘要
研究了近断层脉冲地震动的工程特性。按照《建筑抗震设计规范》(GB50011-2010)进行抗震设计,选择具有前方向性效应、滑冲效应和远场地三类地震动作为输入,采用Sap2000对一座四层钢筋混凝土框架进行非线性时程分析。分析结果表明:对于顶点位移、层间位移角和基底剪力等结构动力响应参数,当结构的地震反应进入弹塑性阶段后,与远场地震动下的反应相比,在具有前方向性效应和滑冲效应地震动作用下,结构的反应有较大幅度的增大,对结构中下部的破坏作用的影响比较显著。
The engineering characteristics of the near-fault ground motion are studied.The four-floor reinforced concrete frame is designed under《Code for seismic design of building》GB50011-2010.The SAP2000 software is applied to model it,and the nonlinear time history analysis of structure is implemented.Ground motions with forward directivity,fling-step and far-field are selected as seismic inputs.The results show that in terms of some structural dynamic response parameters,such as the vertex displacement,the displacement corner between the layers and the base shear,etc.,compared with far-field ground motion,under the function of ground motion with forward directivity and fling-step,the structural responses to the ground motion with near-fault are increased considerable magnitudes when the seismic responses of structures step into the elastic-plastic stage,and the influence on damaging the mid-lower structure is obviously greater.
The engineering characteristics of the near-fault ground motion are studied.The four-floor reinforced concrete frame is designed under《Code for seismic design of building》GB50011-2010.The SAP2000 software is applied to model it,and the nonlinear time history analysis of structure is implemented.Ground motions with forward directivity,fling-step and far-field are selected as seismic inputs.The results show that in terms of some structural dynamic response parameters,such as the vertex displacement,the displacement corner between the layers and the base shear,etc.,compared with far-field ground motion,under the function of ground motion with forward directivity and fling-step,the structural responses to the ground motion with near-fault are increased considerable magnitudes when the seismic responses of structures step into the elastic-plastic stage,and the influence on damaging the mid-lower structure is obviously greater.
引文
[1]Bertero V.Establishment of design earthquakes evaluationof present methods[C].St.Louis:University of Missouri-Rolla,Proceedings International Symposium on Earthquake StructureEngineering,1976,1:551-580.
[2]Bertero V,Mahin S,Herrera R.Aseismic design implica-tions of san Fernando earthquake records[J].EarthquakeEngineering and Structural Dynamics,1978,6(1):31-34.
[3]Ghobarah A.Response of structures to near-fault groundmotions[C].Vancouver,Canada:13WCEE,2004,Paper No.1031.
[4]Ayan A,Boduroglu H.Strengthening of existing reinforcedconcrete buildings and near fault effects[C].Vancouver,Canada:13WCEE,2004,Paper No.1457.
[5]GB 50011-2010建筑抗震设计规范[S].
[6]刘启方,袁一凡,金星,等.近断层地震动的基本特征[J].地震工程与工程震动,2006,26(1):1-10.
[7]赵凤新,韦韬,张郁山.近断层速度脉冲对钢筋混凝土框架结构地震反应的影响[J].工程力学,2008,25(10):180-193.
[8]韦韬.近断层速度脉冲对钢筋混凝土框架结构影响的研究:[中国地震局地球物理研究所硕士学位论文].北京:中国地震局地球物理研究所,2005,1-113.
[9]罗伟.近断层地震作用下钢筋混凝土多层框架结构的响应分析:[北京交通大学硕士学位论文].北京:北京交通大学,2008,1-45.
[10]江义,杨迪雄,李刚.近断层地震动向前方向性效应和滑冲效应对高层钢框架结构的地震反应的影响[J].建筑结构学报,2010,31(9):014-021.
[11]马会杰.近场地震下钢筋混凝土框架抗震性能分析:[湖南大学硕士学位论文].长沙:湖南大学,2009,1-48.
[2]Bertero V,Mahin S,Herrera R.Aseismic design implica-tions of san Fernando earthquake records[J].EarthquakeEngineering and Structural Dynamics,1978,6(1):31-34.
[3]Ghobarah A.Response of structures to near-fault groundmotions[C].Vancouver,Canada:13WCEE,2004,Paper No.1031.
[4]Ayan A,Boduroglu H.Strengthening of existing reinforcedconcrete buildings and near fault effects[C].Vancouver,Canada:13WCEE,2004,Paper No.1457.
[5]GB 50011-2010建筑抗震设计规范[S].
[6]刘启方,袁一凡,金星,等.近断层地震动的基本特征[J].地震工程与工程震动,2006,26(1):1-10.
[7]赵凤新,韦韬,张郁山.近断层速度脉冲对钢筋混凝土框架结构地震反应的影响[J].工程力学,2008,25(10):180-193.
[8]韦韬.近断层速度脉冲对钢筋混凝土框架结构影响的研究:[中国地震局地球物理研究所硕士学位论文].北京:中国地震局地球物理研究所,2005,1-113.
[9]罗伟.近断层地震作用下钢筋混凝土多层框架结构的响应分析:[北京交通大学硕士学位论文].北京:北京交通大学,2008,1-45.
[10]江义,杨迪雄,李刚.近断层地震动向前方向性效应和滑冲效应对高层钢框架结构的地震反应的影响[J].建筑结构学报,2010,31(9):014-021.
[11]马会杰.近场地震下钢筋混凝土框架抗震性能分析:[湖南大学硕士学位论文].长沙:湖南大学,2009,1-48.
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