高速铁路大跨梁拱组合桥施工过程主梁变形分析
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摘要
高速铁路大跨梁拱组合桥主梁线形控制严格,但施工过程复杂且影响因素较多。为研究施工过程主梁变形,以郑州至万州铁路河南段张良镇跨南水北调干渠梁拱组合桥为背景,利用有限元软件MIDAS Civil建立全桥模型,研究施工步骤时间间隔、收缩徐变对主梁变形的影响。分析结果表明:钢管拱混凝土灌注与主梁合龙的时间间隔越长,中跨主梁向下变形变化量越大,不利于主梁线形控制;吊杆张拉与钢管拱混凝土灌注时间间隔几乎不影响主梁位移变化量;混凝土的收缩徐变作用使主梁变形更加复杂,且随着时间延长主梁变形逐渐减少。本文研究成果可为同类桥梁设计及施工控制提供参考。
The linearity control of the main girder of a girder-arch combined bridge for high-speed railways is very strict but the construction process is complex,and there are many influential factors involved in the project. In order to study the deformation of the main girder in the course of construction,and with the girder-arch combined bridge of the Henan Section of the Zhenzhou-Wanzhou Railway spanning the main ditch of the South-to-North Water Diversion Project at Zhangliang Townfor high-speed railways as the background,an analysis model for the whole bridge is established in the paper with the help of the finite element software of MIDAS Civil, with the time intervals between different construction steps and the effect of shrinkage and creep on the deformation of the main girder studied.The results of the analyses show that the longer the time interval between casting the concrete of the concrete-filled steel tube arch and the closure of the main beams, the greater the downward deformation change of the middle span of the main beam, which is not conducive to the linearity control of the main beam. The time interval between the tensioning of the suspender and concrete-filling of the steel-tube arch has little effect on the displacement of the main girder.The shrinkage and creep of concrete make the deformation of the main girder even more complex, and the deformation of the main girder gradually decreases with the lengthening of the time. The research results of this paper can serve as certain reference for the design and construction control of other similar bridges.
The linearity control of the main girder of a girder-arch combined bridge for high-speed railways is very strict but the construction process is complex,and there are many influential factors involved in the project. In order to study the deformation of the main girder in the course of construction,and with the girder-arch combined bridge of the Henan Section of the Zhenzhou-Wanzhou Railway spanning the main ditch of the South-to-North Water Diversion Project at Zhangliang Townfor high-speed railways as the background,an analysis model for the whole bridge is established in the paper with the help of the finite element software of MIDAS Civil, with the time intervals between different construction steps and the effect of shrinkage and creep on the deformation of the main girder studied.The results of the analyses show that the longer the time interval between casting the concrete of the concrete-filled steel tube arch and the closure of the main beams, the greater the downward deformation change of the middle span of the main beam, which is not conducive to the linearity control of the main beam. The time interval between the tensioning of the suspender and concrete-filling of the steel-tube arch has little effect on the displacement of the main girder.The shrinkage and creep of concrete make the deformation of the main girder even more complex, and the deformation of the main girder gradually decreases with the lengthening of the time. The research results of this paper can serve as certain reference for the design and construction control of other similar bridges.
引文
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[8]周世军.钢管混凝土钢构式柔性系杆拱桥的施工控制[J].兰州理工大学学报,2005,31(06):119-122
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[11]罗学睿.钢管混凝土系杆拱桥收缩徐变效应研究[D].西安:长安大学,2015
[12]冯仲伟,李林香,谢永江.混凝土收缩性能的若干问题研究[J].混凝土,2012(04):27-30
[2]陈宝春.钢管混凝土拱桥应用与研究进展[J].公路,2008(11):57-66
[3]肖汝成,陈红,魏乐永.桥梁结构体系的研究、优化与创新[J].土木工程学报,2008 (06):69-74
[4]李杰,陈淮,冯冠杰.钢管混凝土系杆拱桥施工分析与施工控制[J].郑州大学学报(理学版),2016, 48(01):110-115
[5]杜迎东,王起才,张戎令,等.钢管混凝土系杆拱桥拱肋内混凝土不同浇筑工序差异研究[J].铁道科学与工程学报,2016,13(03):500-505
[6]韩保勤.钢管混凝土拱桥吊杆张拉方案比选[J].桥梁建设,2015,45(01):114-119
[7]杨阳.徐变对大跨度钢管混凝土系杆拱桥静力性能的影响研究[D].兰州:兰州交通大学,2015
[8]周世军.钢管混凝土钢构式柔性系杆拱桥的施工控制[J].兰州理工大学学报,2005,31(06):119-122
[9]SHRESTHA K M,CHEN B C,CHEN Y F.State of the art of creep of concrete filled steel tubular arches[J].KSCE Journal of Civil Engineering,2011,15(01):145-151
[10]YANG M G,CAI C S.Creep performance of concrete-filled steel tubular (CFST) columns and applications to a CFST arch bridge[J].Steel and Composite Structures,2015,19(01):111-129
[11]罗学睿.钢管混凝土系杆拱桥收缩徐变效应研究[D].西安:长安大学,2015
[12]冯仲伟,李林香,谢永江.混凝土收缩性能的若干问题研究[J].混凝土,2012(04):27-30