提高拱梁固结拱桥刚度的有效方法
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摘要
拱梁固结拱桥通过主梁作为刚性系杆来平衡拱的推力,但也带来结构刚度下降的不利影响,这使该类拱桥在高速铁路上的应用受到了一定的限制,为了解决这个问题,提出一种新的拱桥加以解决.其做法是,首先在每条拱肋和主梁之间增加10根刚性斜杆与拱肋及主梁节段形成11个三角形结构,尽可能通过三角形角点对拱肋均匀约束,提高拱肋的线刚度;其次,保证有三角形角点落在原结构拱肋位移包络图的最大位移处及主梁跨中位置处,使主梁或拱肋的薄弱点得到加强,线刚度亦得到提高.研究表明,新型拱桥在材料增加很少甚至相同的条件下,其整体刚度均能大幅度提高.还对疲劳和温度响应作了深入的研究,通过有限元分析表明,该结构对疲劳和温度也有很好的适应性.新型拱桥良好的刚度特性对高速铁路桥特别适用.
The main beam of a Arch-beam fixed arch bridge acts as a rigid tie rod to balance the thrust of archs, but it also has the adverse effect of structural stiffness decrease. This has limited the application of this type of arch bridge on high-speed railways. In order to solve this problem, this paper proposes a new arch bridge. The method is, first of all, to add 10 rigid diagonal bars between each ribs and the main beam to form 11 triangle structures with the main beam and the each ribs segments. As far as possible, the arch ribs and the main beam are equally divided by triangular corner points so that the line stiffness of the arch ribs and the main beam are improved. Secondly, according to the original structure displacement envelope diagram, it is guaranteed that the triangular corner points fall at the position of maximum displacement and the mid-span of main beam so that the weakness of arch ribs is strengthened. Studies have shown that the overall stiffness of the new arch bridge can be significantly improved under the condition that the material increases little or even the same. In this paper, the fatigue and temperature responses are also discussed in detail, and finite element analysis shows that the structure also has good adaptability to fatigue and temperature. And the superior stiffness characteristics of the new arch bridge are particularly suitable for high-speed railway bridges.
The main beam of a Arch-beam fixed arch bridge acts as a rigid tie rod to balance the thrust of archs, but it also has the adverse effect of structural stiffness decrease. This has limited the application of this type of arch bridge on high-speed railways. In order to solve this problem, this paper proposes a new arch bridge. The method is, first of all, to add 10 rigid diagonal bars between each ribs and the main beam to form 11 triangle structures with the main beam and the each ribs segments. As far as possible, the arch ribs and the main beam are equally divided by triangular corner points so that the line stiffness of the arch ribs and the main beam are improved. Secondly, according to the original structure displacement envelope diagram, it is guaranteed that the triangular corner points fall at the position of maximum displacement and the mid-span of main beam so that the weakness of arch ribs is strengthened. Studies have shown that the overall stiffness of the new arch bridge can be significantly improved under the condition that the material increases little or even the same. In this paper, the fatigue and temperature responses are also discussed in detail, and finite element analysis shows that the structure also has good adaptability to fatigue and temperature. And the superior stiffness characteristics of the new arch bridge are particularly suitable for high-speed railway bridges.
引文
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[19] 高亮,辛涛,肖宏,等.高速铁路桥上不同轨枕型式动力特性对比[J].同济大学学报(自然科学版),2012,40(1):68.GAO Liang,XIN Tao,XIAO Hong,et al.Comparison of dynamic characteristics of different sleepers on high speed railway bridges[J].Journal of Tongji University(Natural Science),2012,40(1):68.
[20] 铁道第三勘察设计院集团有限公司.铁路桥涵设计规范:TB10002—2017[S].北京:中国铁道出版社,2017.China Railway Sanyuan Survey and Design Group Co.,Ltd..Design code for railway bridges:TB10002—2017[S].Beijing:China Railway Publishing House,2017.
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[2] 魏乐永.拱式结构体系研究[D].上海:同济大学,2007.WEI Leyong.Research on arch structure system [D].Shanghai:Tongji University,2007.
[3] 陈宝春.拱桥技术的回顾与展望[J].福州大学学报(自然科学版),2009,37(1):94.CHEN Baochun.Review and prospect of arch bridge technology [J].Journal of Fuzhou University(Natural Science Edition),2009,37(1):94.
[4] 姚玲森.桥梁工程[M].第2版.北京:人民交通出版社,2008.YAO Lingsen.Bridge engineering[M].2nd ed.Beijing:China Communications Press,2008.
[5] QIN Shunquan,GAO Zongyu.Developments and prospects of long-span high-speed railway bridge technologies in China[J].Engineering,2017,3(6):787.
[6] 张华,徐升桥,彭岚平.南广铁路西江特大桥总体设计[J].钢结构,2015,30(4):17.ZHANG Hua,XU Shengqiao,PENG Lanping.Overall design of Xijiang Bridge of Nanguang railway[J].Steel Structure Press,2015,30(4):17.
[7] 李晓波.汀泗河特大桥1～140m钢箱系杆拱施工技术[J].铁道建筑技术,2009(S1):1.LI Xiaobo.Construction technology of 1～140 m steel box tied arch of tingyi River Bridge[J].Railway Construction Technology,2009(S1):1.
[8] 金福海,文功启,徐勇.武广铁路客运专线140m钢箱系杆拱桥设计及其在高速铁路中的应用[J].铁道标准设计,2010(1):107.JIN Fuhai,WEN Gongqi,XU Yong.Design of 140 m steel box tied arch bridge of wuhan-Guangzhou railway passenger dedicated line and its application in high speed railway[J].Railway Standard Design,2010(1):107.
[9] 张文华.东平水道特大桥(85+286+85)m双拱肋钢桁拱设计[J].铁道标准设计,2015,59(12):40.ZHANG Wenhua.Design of double arch rib steel truss arch of Dongping Waterway Super Large Bridge (85+286+85)[J].Railway Standard Design,2015,59(12):40.
[10] 易伦雄.南京大胜关长江大桥大跨度钢桁拱桥设计研究[J].桥梁建设,2009(5):1.YI Lunxiong.Research on design of long span steel truss arch bridge of Nanjing Dashengguan Changjiang River Bridge[J].Bridge Construction,2009(5):1.
[11] 中铁大桥勘测设计院.南京大胜关长江大桥初步设计[Z].[S.l.]:中铁大桥勘测设计院,2005.China Railway Bridge Survey and Design Institute.Nanjing Dashengguan Yangtze River bridge preliminary design [Z].[S.l.]:China Railway Bridge Survey and Design Institute,2005.
[12] KANG Chongjie,SCHNEIDER S,WENNER M.Development of design and construction of high-speed railway bridges in Germany [J].Engineering Structures,2018,163:184.
[13] FRYBA L.A rough assessment of railway bridges for high speed trains [J].Engineering Structures,2001,23(5):548.
[14] 严翯.拱桥在我国铁路建设中的应用[J].四川建筑,2016,36(2):97.YAN He.Application of arch bridge in railway construction in china[J].Sichuan Architecture,2016,36(2):97.
[15] 沙培洲.高速铁路大跨度简支系杆拱桥设计研究[J].铁道标准设计,2012(7):60.SHA Peizhou.Research on design of long-span simply supported tied arch bridge for high speed railway[J].Railway Standard Design,2012(7):60
[16] 肖汝诚.桥梁结构体系[M].北京:人民交通出版社,2013.XIAO Yucheng.Bridge structure system [M].Beijing:China Communications Press,2013.
[17] 马坤,向天宇,赵人达,等.高速铁路钢筋混凝土拱桥长期变形的随机分析[J].土木工程学报,2012,45(11):141.MA Kun,XIANG Tianyu,ZHAO Renda,et al.A stochastic analysis of long-term deformation of high-speed railway reinforced concrete arch bridge[J].China Civil Engineering Journal,2012,45(11):141.
[18] 占丽金.大跨度高速铁路系杆拱桥动力特性及抗震性分析[D].合肥:合肥工业大学,2014.ZHAN Lijin.Dynamic characteristics and seismic analysis of long-span high-speed railway tied arch bridge [D].Hefei:Hefei University of Technology,2014.
[19] 高亮,辛涛,肖宏,等.高速铁路桥上不同轨枕型式动力特性对比[J].同济大学学报(自然科学版),2012,40(1):68.GAO Liang,XIN Tao,XIAO Hong,et al.Comparison of dynamic characteristics of different sleepers on high speed railway bridges[J].Journal of Tongji University(Natural Science),2012,40(1):68.
[20] 铁道第三勘察设计院集团有限公司.铁路桥涵设计规范:TB10002—2017[S].北京:中国铁道出版社,2017.China Railway Sanyuan Survey and Design Group Co.,Ltd..Design code for railway bridges:TB10002—2017[S].Beijing:China Railway Publishing House,2017.
[21] 中铁大桥勘测设计院有限公司.铁路桥梁钢结构设计规范:TB10091—2017[S].北京:中国铁道出版社,2017.China Railway Major Bridge Reconnaissance Design Institute Co.,Ltd..Code for design of steel structures for railway bridges:TB10091—2017[S].Beijing:China Railway Publishing House,2017.