商合杭铁路矮塔斜拉桥无砟轨道适应性研究
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摘要
研究目的:高速列车运行对无砟轨道的平顺性要求非常严格,而大跨度桥梁在温度荷载作用下引起的主梁竖向变形是引起轨道平顺性发生变化的主要原因。本文以商合杭铁路沙颍河大跨度矮塔斜拉桥为背景,对不同的桥梁结构体系、边跨比、主梁类型、梁高、斜拉索规格及布置、桥塔高度等进行对比分析,研究其对温度变形的影响,从而确定矮塔斜拉桥的无砟轨道适应性。研究结论:(1)矮塔斜拉桥可以满足无砟轨道的平顺性要求,保证高速铁路的行车安全性及舒适性;(2)有效释放梁体收缩徐变及温度变形的桥梁结构体系更加容易满足轨道平顺性要求,应优先选用;(3)斜拉索的温度变化及索梁温差是引起主梁竖向变形的主要因素,确定合适的斜拉索规格、安全系数、索间距,既能充分发挥斜拉索对主梁的贡献,又能减小温度荷载作用下主梁的竖向变形;(4)为减小斜拉索对温度变形的影响,主梁宜采用混凝土结构;(5)本研究成果对今后高速铁路矮塔斜拉桥设计具有一定的指导意义。
Research purposes: Smoothness requirement of HSR operation to ballastless track is very strictly. However,girder's vertical deformation caused by temperature load in large span bridge is the main reason of smoothness variation in track. Taking Shayinghe large span low-pylon cable-stayed bridge in Shangqiu-Hefei-Hangzhou Railway as the background,this paper made a comparative research to the different bridge structure system,span ratio,girder system,girder height,cable specification and arrangement,and pylon height,and studied the influence of foregoing factors to temperature deformation,so as to make sure the applicability of low-pylon cable-stayed bridge to ballastless track.Research conclusions:(1) Low-pylon cable-stayed bridge can satisfy the smoothness requirement of ballastless track,and guarantee the safety and comfortability in the operation of HSR.(2) Bridge structure system which has released the shrink,creep and temperature deformation efficiently can satisfy the smoothness requirement of track more easily. This is a preferable system.(3) Temperature variation of cables and temperature difference between girder and cable are main factors which induce vertical deformation of girder. So if the cable specification,safety coefficient and spacing between cables are confirmed properly,the contribution of cable to girder can be fully developed,and vertical deformation of girder induced by temperature can be reduced.(4) It is more suitable to adopt concrete structure to alleviate the temperature deformation influence imposed on cable.(5) The research results can provide the valuablereference for the design of HSR low-pylon cable-stayed bridge.
Research purposes: Smoothness requirement of HSR operation to ballastless track is very strictly. However,girder's vertical deformation caused by temperature load in large span bridge is the main reason of smoothness variation in track. Taking Shayinghe large span low-pylon cable-stayed bridge in Shangqiu-Hefei-Hangzhou Railway as the background,this paper made a comparative research to the different bridge structure system,span ratio,girder system,girder height,cable specification and arrangement,and pylon height,and studied the influence of foregoing factors to temperature deformation,so as to make sure the applicability of low-pylon cable-stayed bridge to ballastless track.Research conclusions:(1) Low-pylon cable-stayed bridge can satisfy the smoothness requirement of ballastless track,and guarantee the safety and comfortability in the operation of HSR.(2) Bridge structure system which has released the shrink,creep and temperature deformation efficiently can satisfy the smoothness requirement of track more easily. This is a preferable system.(3) Temperature variation of cables and temperature difference between girder and cable are main factors which induce vertical deformation of girder. So if the cable specification,safety coefficient and spacing between cables are confirmed properly,the contribution of cable to girder can be fully developed,and vertical deformation of girder induced by temperature can be reduced.(4) It is more suitable to adopt concrete structure to alleviate the temperature deformation influence imposed on cable.(5) The research results can provide the valuablereference for the design of HSR low-pylon cable-stayed bridge.
引文
[1]TB 10621—2014,高速铁路设计规范[S].TB 10621—2014,Code for Design of High Speed Railway[S].
[2]宋子威,王德志,薛兆钧,等.铁路混凝土部分斜拉桥设计综述及发展方向[J].交通科技,2015(6):28-31.Song Ziwei,Wang Dezhi,Xue Zhaojun,etc.Design Summary and Trend of Partial Cable-stayed Concrete Railway Bridge[J].Transportation Science&Technology,2015(6):28-31.
[3]JTG/T D65—01—2007,公路斜拉桥设计细则[S].JTG/T D65—01—2007,Guidelines for Design of Highway Cable-stayed Bridge[S].
[4]何新平.矮塔斜拉桥的设计[J].公路交通科技,2004(4):66-69.He Xinping.Design of Low Tower Cable-stayed Bridge[J].Journal of Highway and Transportation Research and Development,2004(4):66-69.
[5]陈从春,周海智,肖汝诚.矮塔斜拉桥研究的新进展[J].世界桥梁,2006(1):70-73.Chen Congchun,Zhou Haizhi,Xiao Rucheng.Recent Research Advancement of Extradosed Cable-stayed Bridge[J].World Bridges,2006(1):70-73.
[6]刘高,唐亮,谭皓,等.混合梁斜拉桥钢混结合部的合理位置[J].公路交通科技,2010(6):52-57.Liu Gao,Tang Liang,Tan Hao,etc.Determination of Rationa I Steel-concrete Connection Position for Hybrid Girder Cable-stayed Bridge[J].Journal of Highway and Transportation Research and Development,2010(6):52-57.
[7]吴祖根.矮塔斜拉桥设计综述[J].桥梁工程,2010(1):66-69.Wu Zugen,Review for Cable-stayed Bridge with Short Tower[J].Bridge Engineering,2010(1):66-69.
[8]袁钰,吴京.高塔型矮塔斜拉桥初探[J].公路,2008(1):79-83.Yuan Yu,Wu Jing.Primary Research on Extradosed Bridge with Higher Towers[J].Highway,2008(1):79-83.
[9]梁爱霞,谢尚英.部分斜拉桥斜拉索设计[J].四川建筑,2009(5):112-113.Liang Aixia,Xie Shangying.Design of Cable for Partial Cable-stayed Bridge[J].Sichuan Architecture,2009(5):112-113.
[2]宋子威,王德志,薛兆钧,等.铁路混凝土部分斜拉桥设计综述及发展方向[J].交通科技,2015(6):28-31.Song Ziwei,Wang Dezhi,Xue Zhaojun,etc.Design Summary and Trend of Partial Cable-stayed Concrete Railway Bridge[J].Transportation Science&Technology,2015(6):28-31.
[3]JTG/T D65—01—2007,公路斜拉桥设计细则[S].JTG/T D65—01—2007,Guidelines for Design of Highway Cable-stayed Bridge[S].
[4]何新平.矮塔斜拉桥的设计[J].公路交通科技,2004(4):66-69.He Xinping.Design of Low Tower Cable-stayed Bridge[J].Journal of Highway and Transportation Research and Development,2004(4):66-69.
[5]陈从春,周海智,肖汝诚.矮塔斜拉桥研究的新进展[J].世界桥梁,2006(1):70-73.Chen Congchun,Zhou Haizhi,Xiao Rucheng.Recent Research Advancement of Extradosed Cable-stayed Bridge[J].World Bridges,2006(1):70-73.
[6]刘高,唐亮,谭皓,等.混合梁斜拉桥钢混结合部的合理位置[J].公路交通科技,2010(6):52-57.Liu Gao,Tang Liang,Tan Hao,etc.Determination of Rationa I Steel-concrete Connection Position for Hybrid Girder Cable-stayed Bridge[J].Journal of Highway and Transportation Research and Development,2010(6):52-57.
[7]吴祖根.矮塔斜拉桥设计综述[J].桥梁工程,2010(1):66-69.Wu Zugen,Review for Cable-stayed Bridge with Short Tower[J].Bridge Engineering,2010(1):66-69.
[8]袁钰,吴京.高塔型矮塔斜拉桥初探[J].公路,2008(1):79-83.Yuan Yu,Wu Jing.Primary Research on Extradosed Bridge with Higher Towers[J].Highway,2008(1):79-83.
[9]梁爱霞,谢尚英.部分斜拉桥斜拉索设计[J].四川建筑,2009(5):112-113.Liang Aixia,Xie Shangying.Design of Cable for Partial Cable-stayed Bridge[J].Sichuan Architecture,2009(5):112-113.