沪昆高铁北盘江特大桥主拱结构形式及参数比选
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摘要
沪昆高铁北盘江特大桥位于我国云贵高原艰险山区,主桥采用445m的上承式混凝土拱桥跨越V形峡谷,最高设计行车速度350km/h。依据该桥的艰险山区建桥条件和高速铁路使用功能要求,对其主拱的结构形式及主要结构参数进行研究。在选定劲性骨架施工方法的基础上,对比分析箱形板拱和箱形肋拱2种拱圈结构形式,从主拱施工的便利性和灵活性等考虑,优选了箱形板拱结构。对比三次样条曲线、高次抛物线和悬链线3种拱轴线形,最终选择了使全拱的应力更均匀的悬链线,拱轴系数取1.6。拱圈构造采用施工便利、整体性更好的等高、拱脚附近局部变宽的单箱三室截面,拱圈高度选用9.0m,拱圈宽度根据车-桥耦合仿真分析结果优选了18～28m方案。主拱圈顶板、底板厚度,根据其应力累加的过程和受力要求进行分段设置,可充分利用材料强度。
Located in the perilous mountainous area of Yunnan-Guizhou Plateau,the Beipanjiang Bridge on Shanghai-Kunming High-Speed Railway crosses the V-shaped canyon by adopting a deck-type concrete arch bridge with a main span of 445 m,and the highest design speed is 350 km/h.In order to fulfill the constructional conditions in the perilous mountainous area and to meet the functional requirements of high-speed railway,we studied the structural type and the main structural parameters of the main arch.Meanwhile,we comparatively analyzed two types of arch rings,namely,the flat box arch ring and ribbed box arch ring,based on the selection of stiff skeleton construction method.Thereafter,the flat box arch ring is finally chosen,since it is convenient and flexible for construction.Then,we compared three types of arch axes,namely,the cubic spline curve,the high-order parabola,and the catenary curve,and finally adopted the catenary curve,of which the arch axis coefficient is taken as 1.6,for the stress of the full arch is more uniform.The arch ring structure,which is composed of single-box three-cell section with equal height and local widening near arch foot,is adopted due to its constructional convenience and better overall mechanical performance,and the height of the arch ring is taken as 9.0 m.The width of the arch ring is optimized as 18-28 m,based on the results of the vehicle-bridge coupling simulation analysis.The thickness of the top and bottom plates of the arch ring should segmentally set according to the stress accumulation process and mechanical requirements,thus the material strength can be fully utilized.
Located in the perilous mountainous area of Yunnan-Guizhou Plateau,the Beipanjiang Bridge on Shanghai-Kunming High-Speed Railway crosses the V-shaped canyon by adopting a deck-type concrete arch bridge with a main span of 445 m,and the highest design speed is 350 km/h.In order to fulfill the constructional conditions in the perilous mountainous area and to meet the functional requirements of high-speed railway,we studied the structural type and the main structural parameters of the main arch.Meanwhile,we comparatively analyzed two types of arch rings,namely,the flat box arch ring and ribbed box arch ring,based on the selection of stiff skeleton construction method.Thereafter,the flat box arch ring is finally chosen,since it is convenient and flexible for construction.Then,we compared three types of arch axes,namely,the cubic spline curve,the high-order parabola,and the catenary curve,and finally adopted the catenary curve,of which the arch axis coefficient is taken as 1.6,for the stress of the full arch is more uniform.The arch ring structure,which is composed of single-box three-cell section with equal height and local widening near arch foot,is adopted due to its constructional convenience and better overall mechanical performance,and the height of the arch ring is taken as 9.0 m.The width of the arch ring is optimized as 18-28 m,based on the results of the vehicle-bridge coupling simulation analysis.The thickness of the top and bottom plates of the arch ring should segmentally set according to the stress accumulation process and mechanical requirements,thus the material strength can be fully utilized.
引文
[1]李亚东,姚昌荣,梁艳.浅论拱桥的技术进步与挑战[J].桥梁建设,2012,42(2):13-20.(LI Ya-dong,YAO Chang-rong,LIANG Yan.On Technical Advancement and Challenge of Arch Bridges[J].Bridge Construction,2012,42(2):13-20.in Chinese)
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[4]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):94-106.(CHEN Bao-chun.View and Review of Arch Bridge Technology[J].Journal of Fuzhou University(Natural Science Edition),2009,37(1):94-106.in Chinese)
[5]陈宝健,许有胜,陈宝春.日本钢筋混凝土拱桥的调查与分析[J].中外公路,2005(4):96-101.(CHEN Bao-jian,XU You-sheng,CHEN Bao-chun.Investigation and Analysis of Reinforced Concrete Arch Bridges in Japan[J].Journal of China and Foreign Highway,2005(4):96-101.in Chinese)
[6]谢海清.特大跨度铁路劲性骨架混凝土拱桥结构选型及关键力学问题研究(博士学位论文)[D].成都:西南交通大学,2012.(XIE Hai-qing.Study on Structural Type Selection and Mechanical Behaviors of Long-Span Railway Concrete Arch Bridge with Rigid Skeleton(Doctorate Dissertation)[D].Chengdu:Southwest Jiaotong University,2012.in Chinese)
[7]蒋建军,蒋劲松.攀枝花市新密地大桥主拱圈设计[J].桥梁建设,2014,44(5):108-111.(JIANG Jian-jun,JIANG Jin-son.Design of Main Arch Ring of New Midi Bridge in Panzhihua City[J].Bridge Construction,2014,44(5):108-111.in Chinese)
[8]TB 10621-2014,高速铁路设计规范[S].(TB 10621-2014,Code for Design of High Speed Railway[S].)
[9]方诗圣,王文洋,汪俊,等.斜跨拱连续梁桥静力性能及部分参数分析[J].世界桥梁,2013,41(6):33-38.(FANG Shi-sheng,WANG Wen-yang,WANG Jun,et al.Analysis of Static Performance and Partial Parameters of a Continuous Girdger Bridge with Skew Arch[J].World Bridges,2013,41(6):33-38.in Chinese)
[10]TB 10002.1-2005,铁路桥涵设计基本规范[S].(TB 10002.1-2005,Foundamental Code for Design on Railway Bridge and Culvert[S].)
[11]西南交通大学.沪昆客运专线北盘江特大桥车桥耦合仿真分析报告[R].成都:2009.(Southwest Jiaotong University.Analysis Report on Simulation Vehicle-Bridge Coupling of Beipan River Bridge of Shanghai-Kunming Passenger Line[R].Chengdu:2009.in Chinese)
[12]中国铁道科学研究院.沪昆客运专线北盘江特大桥动力特性仿真分析报告[R].北京:2009.(China Academy of Railway Sciences.Analysis Report on Simulation Dynamic Characteristics of Beipan River Bridge of Shanghai-Kunming Passenger Line[R].Bejing:2009.in Chinese)
[2]何畏,周伟光,陈俊诚.悬臂浇筑拱桥扣索索力优化研究[J].桥梁建设,2015,45(3):32-36.(HE Wei,ZHOU Wei-guang,Tran Tuan Thanh.Study of Optimization of Fastening Stay Forces for Arch Bridge Constructed by Cantilever Casting[J].Bridge Construction,2015,45(3):32-36.in Chinese)
[3]陈宝春,叶琳.我国混凝土拱桥现状调查与发展方向分析[J].中外公路,2008,28(2):89-96.(CHEN Bao-chun,YE Lin.Analysis of Investigation and Development Direction of Concrete Arch Bridge in China[J].Journal of China&Foreign Highway,2008,28(2):89-96.in Chinese)
[4]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):94-106.(CHEN Bao-chun.View and Review of Arch Bridge Technology[J].Journal of Fuzhou University(Natural Science Edition),2009,37(1):94-106.in Chinese)
[5]陈宝健,许有胜,陈宝春.日本钢筋混凝土拱桥的调查与分析[J].中外公路,2005(4):96-101.(CHEN Bao-jian,XU You-sheng,CHEN Bao-chun.Investigation and Analysis of Reinforced Concrete Arch Bridges in Japan[J].Journal of China and Foreign Highway,2005(4):96-101.in Chinese)
[6]谢海清.特大跨度铁路劲性骨架混凝土拱桥结构选型及关键力学问题研究(博士学位论文)[D].成都:西南交通大学,2012.(XIE Hai-qing.Study on Structural Type Selection and Mechanical Behaviors of Long-Span Railway Concrete Arch Bridge with Rigid Skeleton(Doctorate Dissertation)[D].Chengdu:Southwest Jiaotong University,2012.in Chinese)
[7]蒋建军,蒋劲松.攀枝花市新密地大桥主拱圈设计[J].桥梁建设,2014,44(5):108-111.(JIANG Jian-jun,JIANG Jin-son.Design of Main Arch Ring of New Midi Bridge in Panzhihua City[J].Bridge Construction,2014,44(5):108-111.in Chinese)
[8]TB 10621-2014,高速铁路设计规范[S].(TB 10621-2014,Code for Design of High Speed Railway[S].)
[9]方诗圣,王文洋,汪俊,等.斜跨拱连续梁桥静力性能及部分参数分析[J].世界桥梁,2013,41(6):33-38.(FANG Shi-sheng,WANG Wen-yang,WANG Jun,et al.Analysis of Static Performance and Partial Parameters of a Continuous Girdger Bridge with Skew Arch[J].World Bridges,2013,41(6):33-38.in Chinese)
[10]TB 10002.1-2005,铁路桥涵设计基本规范[S].(TB 10002.1-2005,Foundamental Code for Design on Railway Bridge and Culvert[S].)
[11]西南交通大学.沪昆客运专线北盘江特大桥车桥耦合仿真分析报告[R].成都:2009.(Southwest Jiaotong University.Analysis Report on Simulation Vehicle-Bridge Coupling of Beipan River Bridge of Shanghai-Kunming Passenger Line[R].Chengdu:2009.in Chinese)
[12]中国铁道科学研究院.沪昆客运专线北盘江特大桥动力特性仿真分析报告[R].北京:2009.(China Academy of Railway Sciences.Analysis Report on Simulation Dynamic Characteristics of Beipan River Bridge of Shanghai-Kunming Passenger Line[R].Bejing:2009.in Chinese)
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