多跨连续梁桥挂篮施工线形优化研究

发布时间：2018-02-11 15:50

本文关键词： 挂篮施工施工监控线形优化　出处：《合肥工业大学》2015年硕士论文　论文类型：学位论文

【摘要】：随着我国经济的高速发展,基础建设在国民经济发展中的重要性不言而喻,尤其是桥梁建设更是城市道路交通枢纽中的关键环节。桥梁以其跨越障碍物的能力成为交通建设中必不可少的一环。这其中预应力混凝土桥梁作为一种古老的桥梁结构型式,越来越发挥着它的重要性,而预应力混凝土连续梁桥的建设必然少不了悬臂浇筑施工法,它是目前为止混凝土连续梁桥最常用的施工方法,其方法结构形式较为合理,施工造价便宜,无需占用桥跨之间的场地而受到青睐。但是悬臂法施工也存在一系列不可预知的风险,同时也会产生较为复杂的应力和挠度的变化。由于混凝土材料的各项不均匀质性、几何参数的变异性以及温度等各种不确定因素的影响,也使得成桥后的内力与线形与设计值不能很好的吻合。因此合理的施工方法是保证桥梁安全健康的重要手段,而随着桥梁施工监控的介入,许多问题得以很好的解决,它是通过对桥梁施工前期、施工过程及施工后期的全过程参与,很好的把设计与施工结合起来。通过对芜湖荆山大桥进行现场数据实测及有限元模拟分析,结果表明：①连续梁主梁各阶段施工关键控制点各项指标(如：挠度、应力)实测值与理论值吻合程度较高；②通过有限元软件MIDAS建模计算分析,得到混凝土连续梁桥施工过程中各断面及成桥后状态均处于受压状态,受力满足桥梁施工规范要求,表明桥梁在悬臂施工过程中安全性较高,同时软件分析也为施工监控提供有力的保证；③芜湖荆山大桥连续梁在施工过程中必然受到多种外部因素的影响,进行相应的参数简化计算尤为重要；④连续梁桥施工过程中各断面应力及成桥后线形基本满足设计要求,施工预拱度设置比较合理。本篇硕士论文对连续梁桥的受力特点及施工控制做了较为详细的阐述,可以作为同类型桥梁施工监控的依据。
[Abstract]:With the rapid development of China's economy, it is self-evident importance of basic construction in the development of national economy, especially the bridge construction is the key link city road traffic hub in the bridge. The obstacle crossing ability has become a necessary link in the traffic construction. The prestressed concrete bridge as an ancient bridge type, plays more and more importance to it, and the construction of prestressed concrete continuous beam bridge cantilever construction method is inevitable, it is by far the most commonly used concrete continuous girder bridge construction method, the method of structure is more reasonable, the construction cost is cheap, without occupying the bridge between the site and popular. But the cantilever construction method also has a series of unpredictable risks, will also have a more complex change of stress and deflection of the concrete material is due. Uniform quality, variability and temperature of various geometric parameters of uncertain factors, also makes the bridge internal force and alignment with the design values are not well consistent. So the reasonable construction method is an important means to ensure the safety and health of the bridge, with the bridge construction monitoring and intervention, many problems can be solved well, it is through the bridge construction, the whole process in the construction process and the construction of the post, good to the design and construction combined. Through the field data test and finite element simulation analysis on Wuhu Jingshan bridge showed a continuous girder in each stage of construction indicators (the key control points such as: deflection, stress) results with higher theoretical value; through the finite element software MIDAS modeling calculation and analysis, get the construction process of concrete continuous beam bridge in each section and bridge state In compression, the stress of the bridge construction specifications, show high safety in bridge cantilever construction process, and software analysis also provides a powerful guarantee for the construction monitoring; the Wuhu Jingshan bridge continuous beam in the construction process will inevitably be affected by many external factors, simplify the corresponding parameter calculation should be particularly important; the construction process of the cross section of continuous girder bridge and the bridge alignment can basically meet the design requirements, construction camber setting is reasonable. This thesis on continuous beam bridge force characteristics and construction control are described in detail, can be used as the basis of the same type bridge construction control.

【学位授予单位】：合肥工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U445.4

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