浅源强震下RC梁式桥横向碰撞参数研究
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摘要
针对地震作用下桥梁结构梁体与横向挡块间的碰撞现象,采用非线性动力分析方法对影响碰撞效应的主要因素进行了系统研究。基于刚体碰撞理论,建立能考虑碰撞过程中能量损失的桥梁横向碰撞接触单元分析模型,研究了典型的浅源强震作用下挡块碰撞刚度、梁体与挡块间初始间隙、桥梁墩高以及跨径等因素对铁路RC简支梁桥地震碰撞效应的影响。研究表明抗震挡块对于防止横向落梁有显著的抑制作用,建议了铁路RC梁式桥抗震挡块的合理刚度及初始间隙取值,提炼了墩高及跨径对各项响应指标的影响规律。研究成果可供梁式桥抗震设计及规范修编参考。
Aiming at the transverse pounding phenomenon between girder and retainer of girder bridges under earthquake excitation,the primary factors affecting pounding effects were studied systematically via nonlinear dynamical analysis.Based on the pounding theory of rigid body,the contact element model of transverse pounding which can take into account energy dissipation was established to discuss the influences of pounding stiffness,width of initial gap,pier height as well as beam span on pounding effects of railway RC girder bridges under typical shallow source earthquake.The results show the transverse seismic retainer is an effective measure to forefend beams from falling from piers.The rational values of pounding stiffness and initial gaps width were suggested,and the inflencing rules of pier height and beam span were essentialized.The research achievement can provide reference to the seismic design of girder bridge and the revision of seismic design codes.
Aiming at the transverse pounding phenomenon between girder and retainer of girder bridges under earthquake excitation,the primary factors affecting pounding effects were studied systematically via nonlinear dynamical analysis.Based on the pounding theory of rigid body,the contact element model of transverse pounding which can take into account energy dissipation was established to discuss the influences of pounding stiffness,width of initial gap,pier height as well as beam span on pounding effects of railway RC girder bridges under typical shallow source earthquake.The results show the transverse seismic retainer is an effective measure to forefend beams from falling from piers.The rational values of pounding stiffness and initial gaps width were suggested,and the inflencing rules of pier height and beam span were essentialized.The research achievement can provide reference to the seismic design of girder bridge and the revision of seismic design codes.
引文
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[5]王军文,李建中,范立础.非规则梁桥伸缩缝处的碰撞对地震反应的影响[J].土木工程学报,2006,39(1):54-59.
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[14]聂利英,范立础.地震作用下城市立交抗震挡防撞措施分析[J].中国公路学报,2006,19(3):49-53.
[15]邓育林,彭天波,李建中.地震作用下桥梁结构横向碰撞模型及参数分析[J].振动与冲击,2007,26(9):104-107,119.
[16]王军文,李建中,范立础.非规则梁桥横桥向地震碰撞反应分析[J].振动与冲击,2010,29(6):25-30,233.
[17]Malhotra P K,Huang M J,Shakal A F.Seismic interaction atseparation joints of an instrumented concrete bridge[J].Earthquake Engineering and Structural Dynamics,1995,24(8):1055-1067.
[18]Jankowski R,Wilde K,Fujino Y.Pounding of superstructuresegments in isolated elevated bridge during earthquakes[J].Earthquake Engineering and Structural Dynamics,1998,27(5):487-502.
[19]王东升,冯启民,王国新.基于直杆共轴碰撞理论的桥梁地震反应邻梁碰撞分析模型[J].工程力学,2004,21(2):157-166.
[20]聂利英,李建中,范立础.地震作用下结构碰撞的模型参数及其影响分析[J].工程力学,2005,22(5):142-146,6.
[21]川岛一彦,长岛博之.落桥防止装置设场合の免震桥の地震应答特性[J].土木技术资料,1992,34(10).
[2]杜修力,韩强,李忠献,等.5.12汶川地震中山区公路桥梁震害及启示[J].北京工业大学学报,2008,34(12):1270-1279.
[3]Anagnostopoulos S A.Equivalent viscous damping formodeling inelastic impacts in earthquake pounding problems[J].Earthquake Engineering and Structural Dynamics,2004,33:897-902.
[4]李建中,范立础.非规则梁桥纵向地震反应及碰撞效应[J].土木工程学报,2005,38(1):84-90.
[5]王军文,李建中,范立础.非规则梁桥伸缩缝处的碰撞对地震反应的影响[J].土木工程学报,2006,39(1):54-59.
[6]Jankowski R,Wilde K,Fujino Y.Reduction of poundingeffects in elevated bridges during earthquakes[J].Earthquake Engineering and Structural Dynamics,2000,29:195-212.
[7]王军文,李建中,范立础.连续梁桥纵向地震碰撞反应参数研究[J].中国公路学报,2005,18(4):42-47.
[8]王军文,张运波,李建中,等.地震动行波效应对连续梁桥纵向地震碰撞反应的影响[J].工程力学,2007,24(11):100-105.
[9]Maleki S.Effect of side retainers on seismic response ofbridges with elastomeric bearings[J].Journal of BridgeEngineering,2004,9(1):95-100.
[10]Maleki S.Seismic modeling of skewed bridges with elastomericbearings and side retainers[J].Journal of BridgeEngineering,2005,10(4):442-449.
[11]GB50011-2006铁路工程抗震设计规范[S].北京:中国计划出版社,2009.
[12]JTG/T B02-01-2008公路桥梁抗震设计细则[S].北京:人民交通出版社,2008(JTG/T B02-01-2008.
[13]范立础,胡世德,叶爱君.大跨度桥梁抗震设计[M].北京:人民交通出版社,2001.
[14]聂利英,范立础.地震作用下城市立交抗震挡防撞措施分析[J].中国公路学报,2006,19(3):49-53.
[15]邓育林,彭天波,李建中.地震作用下桥梁结构横向碰撞模型及参数分析[J].振动与冲击,2007,26(9):104-107,119.
[16]王军文,李建中,范立础.非规则梁桥横桥向地震碰撞反应分析[J].振动与冲击,2010,29(6):25-30,233.
[17]Malhotra P K,Huang M J,Shakal A F.Seismic interaction atseparation joints of an instrumented concrete bridge[J].Earthquake Engineering and Structural Dynamics,1995,24(8):1055-1067.
[18]Jankowski R,Wilde K,Fujino Y.Pounding of superstructuresegments in isolated elevated bridge during earthquakes[J].Earthquake Engineering and Structural Dynamics,1998,27(5):487-502.
[19]王东升,冯启民,王国新.基于直杆共轴碰撞理论的桥梁地震反应邻梁碰撞分析模型[J].工程力学,2004,21(2):157-166.
[20]聂利英,李建中,范立础.地震作用下结构碰撞的模型参数及其影响分析[J].工程力学,2005,22(5):142-146,6.
[21]川岛一彦,长岛博之.落桥防止装置设场合の免震桥の地震应答特性[J].土木技术资料,1992,34(10).
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