强震作用下大跨斜拉桥伸缩缝处碰撞效应的影响研究
|
摘要
大跨斜拉桥一般采用飘浮体系或者弹性约束体系,其在强震作用下梁端会发生很大位移,梁端的过大位移可能会导致主梁与相邻跨引桥的碰撞,使整个结构丧失整体性。针对强震作用下大跨斜拉桥伸缩缝处的碰撞现象,以一座典型大跨斜拉桥为例,建立了考虑引桥墩柱、塔柱弹塑性的空间非线性碰撞模型,采用非线性时程法研究大跨斜拉桥伸缩缝处相邻跨梁体碰撞对桥梁结构地震反应的影响。研究结果表明:由于大跨桥梁结构主、引桥结构体系不同,在强震作用下主引桥相邻梁体易发生碰撞,碰撞不仅会产生很大的撞击力,而且使引桥地震力需求、引桥梁端位移、主引桥相对位移及引桥梁体搭接长度需求有较大增长,极易造成引桥的落梁或者破坏;而碰撞效应对主桥的地震需求影响较小。
Based on the pounding phenomenon at expansion joints of a typical long-span cable-stayed bridge under strong earthquake,the complex nonlinear model considering the elasto-plastic behaviors of piers and pylon as well as the relative pound responses between main span and approach span was developed.With the time history analysis for determining the nonlinear seismic responses,the pounding effects of adjacent girders at expansion joints on seismic responses of the bridge were studied.The results indicate that the pounding can amplify obviously the seismic forces acting on piers of approach span,the displacement of beam of approach span,the relative displacement between main span and approach span and may demand the increase of the hinge seat width of beam of approach span.It causes easily the collision of falling-beams with structures under strong earthquakes.However,the pounding has minor effects on the seismic demand of main span.
Based on the pounding phenomenon at expansion joints of a typical long-span cable-stayed bridge under strong earthquake,the complex nonlinear model considering the elasto-plastic behaviors of piers and pylon as well as the relative pound responses between main span and approach span was developed.With the time history analysis for determining the nonlinear seismic responses,the pounding effects of adjacent girders at expansion joints on seismic responses of the bridge were studied.The results indicate that the pounding can amplify obviously the seismic forces acting on piers of approach span,the displacement of beam of approach span,the relative displacement between main span and approach span and may demand the increase of the hinge seat width of beam of approach span.It causes easily the collision of falling-beams with structures under strong earthquakes.However,the pounding has minor effects on the seismic demand of main span.
引文
[1]Mathotra P K.Dynamics of seismic pounding at expansionjoints of concrete bridges[J].Journal of EngineeringMechanics/July,1998:794-802.
[2]Chouw N,Hong Hao.Study of SSI and non-uniform groundmotion effect on pounding between bridge girders[J].SoilDynamics and Earthquake Engineering,2005,25:717-728.
[3]Jankowski R,Wilde K,Fujino Y.Reduction of poundingeffects in elevated bridges during earthquakes[J].Earthquake Engineering and Structural Dynamics,2000,29:195-212.
[4]Ruangrassamee A,Kawashima K.Relative displacementresponse spectra with pounding effect[J].EarthquakeEngineering and Structural Dynamics,2001,30:1511-1538.
[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,2006,30(1):54-59.
[6]王斌斌,叶爱君.地震作用下大跨度斜拉桥和引桥间碰撞分析[J].振动与冲击,2010,29(3):95-99.
[7]赵建伟,邹立华,方雷庆,等.考虑相邻建筑物碰撞的基础隔震结构的地震反应分析[J].振动与冲击,2010,29(5):215-219.
[8]Muthukumar S.A contact element approach with hysteresisdamping for the analysis and design of pounding in bridges[D].2003,11.
[9]Menegotto M,Pinto P E.Method of analysis for cyclicallyloaded reinforced concrete plane frames including changes ingeometry and non-elastic behavior of elements undercombined normal force and bending[C].Proceedings,IABSE Symposium on Resistance and Ultimate Deformabilityof Structures,Lisbon,1973,15-22.
[10]OpenSees command language manual[M].PacificEarthquake Engineering Research Center,University ofCalifornia,Berkeley,OpenSees version 1.7.3.2007.
[2]Chouw N,Hong Hao.Study of SSI and non-uniform groundmotion effect on pounding between bridge girders[J].SoilDynamics and Earthquake Engineering,2005,25:717-728.
[3]Jankowski R,Wilde K,Fujino Y.Reduction of poundingeffects in elevated bridges during earthquakes[J].Earthquake Engineering and Structural Dynamics,2000,29:195-212.
[4]Ruangrassamee A,Kawashima K.Relative displacementresponse spectra with pounding effect[J].EarthquakeEngineering and Structural Dynamics,2001,30:1511-1538.
[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,2006,30(1):54-59.
[6]王斌斌,叶爱君.地震作用下大跨度斜拉桥和引桥间碰撞分析[J].振动与冲击,2010,29(3):95-99.
[7]赵建伟,邹立华,方雷庆,等.考虑相邻建筑物碰撞的基础隔震结构的地震反应分析[J].振动与冲击,2010,29(5):215-219.
[8]Muthukumar S.A contact element approach with hysteresisdamping for the analysis and design of pounding in bridges[D].2003,11.
[9]Menegotto M,Pinto P E.Method of analysis for cyclicallyloaded reinforced concrete plane frames including changes ingeometry and non-elastic behavior of elements undercombined normal force and bending[C].Proceedings,IABSE Symposium on Resistance and Ultimate Deformabilityof Structures,Lisbon,1973,15-22.
[10]OpenSees command language manual[M].PacificEarthquake Engineering Research Center,University ofCalifornia,Berkeley,OpenSees version 1.7.3.2007.
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