横系梁对双柱墩混凝土曲线梁桥地震反应的影响分析
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摘要
为研究地震作用下,钢筋混凝土曲线梁桥中横系梁设置位置、刚度对结构受力的影响规律,以设置2道横系梁的双柱墩曲线梁桥为背景,考虑曲线梁桥的弯扭耦合效应和主梁间的非均匀碰撞效应,运用大型有限元软件ABAQUS建立桥梁的三维多尺度模型,设置6种横系梁位置工况,采用时程分析法分析不同位置横系梁对桥梁主梁、支座和桥墩的地震反应影响。最后,选择上述计算结果中较为合理的工况为背景,进一步研究横系梁刚度对桥梁地震反应的影响。研究结果表明:横系梁位置的变化对地震作用下曲线梁桥的主梁横向位移、支座受力、墩顶横向位移及墩底扭矩有比较明显的影响;横系梁沿墩柱较为均匀地分布时,对桥梁地震反应行为最为有利;适当地提高横系梁刚度可以减小桥梁的地震反应。
To study the influence of installation locations and stiffness of cross tie beams on the structural load bearing behavior of the reinforced concrete curved bridge under the action of earthquake,the curved beam bridge with two-columned piers and two cross tie beams is taken as the study background.Taking into consideration of the torsion-bending coupled effect of the curved beam bridge and the unbalanced collision effect between the main beams,the finite element software ABAQUS was used to establish the three-dimensional multi-scale models of the bridge.Six ways of cross tie beam installation were considered,and the time history method was used to analyze the influence of seismic reaction of cross tie beams in different locations on the main beam,bearings and piers.Finally,the relatively rational load case gained by calculation was taken as the background,to further study the stiffness of cross tie beam on the seismic reaction of the bridge.The results of the study indicate that the variation of the location of cross tie beams has palpable influence on the transverse displacement of the main beam,load bearing condition of the bearings,pier-top transverse displacement and the pier base torsional moment of the curved beam bridge under seismic reaction.The condition that the cross tie beams are uniformly distributed along the pier columns is the most favorable condition for the seismic reaction of the bridge.The rational increase of the stiffness of cross tie beams can reduce the seismic reaction of the bridge.
To study the influence of installation locations and stiffness of cross tie beams on the structural load bearing behavior of the reinforced concrete curved bridge under the action of earthquake,the curved beam bridge with two-columned piers and two cross tie beams is taken as the study background.Taking into consideration of the torsion-bending coupled effect of the curved beam bridge and the unbalanced collision effect between the main beams,the finite element software ABAQUS was used to establish the three-dimensional multi-scale models of the bridge.Six ways of cross tie beam installation were considered,and the time history method was used to analyze the influence of seismic reaction of cross tie beams in different locations on the main beam,bearings and piers.Finally,the relatively rational load case gained by calculation was taken as the background,to further study the stiffness of cross tie beam on the seismic reaction of the bridge.The results of the study indicate that the variation of the location of cross tie beams has palpable influence on the transverse displacement of the main beam,load bearing condition of the bearings,pier-top transverse displacement and the pier base torsional moment of the curved beam bridge under seismic reaction.The condition that the cross tie beams are uniformly distributed along the pier columns is the most favorable condition for the seismic reaction of the bridge.The rational increase of the stiffness of cross tie beams can reduce the seismic reaction of the bridge.
引文
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[2]Olmos J M,Astiz M A.Analysis of the Lateral Dynamic Response of High Pier Viaducts Under High-Speed Train Travel[J].Engineering Structures,2013,56:1 384-1 401.
[3]叶爱君,管仲国,范立础.桥梁抗震[M].北京:人民交通出版社,2011.
[4]Sennah K M,Kennedy J B.State-of-the-Art in Curved Box-Girder Bridges[J].Journal of Bridge Engineering,2002,7(2):134-143.
[5]王晓黎.某高速铁路连续梁桥桥墩地震反应分析[J].世界桥梁,2012,40(4):38-41.
[6]沈星,叶爱军,王晓伟.柔性横系梁双柱墩的抗震行为分析[J].同济大学学报,2013,41(3):342-347.
[7]刘一波,李盛桢.无帽梁双柱式桥墩横系梁设置问题探讨[J].公路交通科技(应用技术版),2009,(10):119-121.
[8]兰峰,王克海.中小跨径双柱式高墩桥梁横系梁对抗震性能的影响[J].公路交通科技,2011,28(5):92-97.
[9]梁雄,卢绍鸿,左智飞,等.柱间系梁对双圆柱高墩受力影响研究[J].广东公路交通,2013,(3):1-4.
[10]商宇,叶爱军,翁健健.横系梁对双柱墩及其基础地震反应的影响[J].结构工程师,2013,29(5):96-100.
[11]黄德耕,罗吉智,谭洪河,等.刚架拱桥横系梁加固技术研究[J].桥梁建设,2012,42(6):45-49.
[12]Lee J,Fenves G L.Plastic Damage Model for Cyclic Loading of Concrete Structures[J].Journal of Engineering Mechanic,1988,124(8):892-900.
[13]张劲,王庆扬,胡守营,等.ABAQUS混凝土损伤塑性模型参数验证[J].建筑结构,2008,38(8):127-130.
[14]陆新征,林旭川,叶列平.多尺度有限元建模方法及其应用[J].华中科技大学学报(城市科学版),2008,25(4):76-80.
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