大跨径连续刚构桥施工控制及敏感性分析

发布时间：2019-01-18 21:35

【摘要】：随着我国交通行业的高速发展,大跨径连续刚构桥的使用越来越频繁,尤其在地形复杂的西部山区,大跨径连续刚构桥由于使用悬臂浇筑的方法进行施工,因此能够很好地跨越山谷、河流等地形。但是在其施工中影响结构的因素过多,导致各个施工阶段结构的状态与设计理论状态有偏差,最终使成桥后结构各方面无法与设计状态相吻合,因此桥梁施工监控在施工中有着重要的意义。本文主要研究内容如下:首先,简要介绍大跨径连续刚构桥的概念、特点及施工方法。同时论述施工控制的重要性,以及国内外对于桥梁施工控制的研究状况。其次,简要叙述施工控制的内容和方法,同时讨论影响桥梁结构施工的主要参数,引入敏感性分析的概念。最后,以摩西沟大桥为例,论述了摩西沟大桥进行施工监控的内容和方法以及取得的成果,同时通过参数单因子敏感性研究各参数对结构线形的敏感程度,并确定设计中需要考虑的主要参数以及次要参数,根据参数单因子敏感性分析可知,混凝土的容重对于结构线形的影响很大,需要在施工中对各节段进行试验分析,得到容重的真实值并作出相应的调整,保证桥梁成桥后受力状态和线形与设计状态基本相符。混凝土的弹性模量对结构线形的影响次之,而相对于混凝土的容重和弹性模量对结构线形的影响,管道摩阻系数、管道偏差系数和环境湿度则属于设计次要参数,对结构的线形影响较小。在参数单因子敏感性分析的基础上选取一定的组合进行参数双因子敏感性分析,试探性研究各参数组合作用对结构线形的影响程度。
[Abstract]:With the rapid development of transportation industry in our country, the use of long-span continuous rigid frame bridge is becoming more and more frequent, especially in the mountainous area of western China with complicated terrain, the long-span continuous rigid frame bridge is constructed by the method of cantilever pouring. Thus it is possible to cross over valleys, rivers, etc. However, there are too many factors that affect the structure in the construction, which leads to the deviation between the state of the structure and the design theory state in each construction stage, and finally makes the structure after the completion of the bridge can not match with the design state. Therefore, bridge construction monitoring is of great significance in construction. The main contents of this paper are as follows: firstly, the concept, characteristics and construction methods of long span continuous rigid frame bridge are briefly introduced. At the same time, the importance of construction control and the research status of bridge construction control at home and abroad are discussed. Secondly, the contents and methods of construction control are briefly described, and the main parameters affecting the construction of bridge structure are discussed, and the concept of sensitivity analysis is introduced. Finally, taking Moshe ditch Bridge as an example, the contents, methods and achievements of construction monitoring of Moshe ditch Bridge are discussed. At the same time, the sensitivity of each parameter to structural alignment is studied by single factor sensitivity. According to the single factor sensitivity analysis of the parameters, the concrete bulk density has a great influence on the structure line shape, so it is necessary to carry on the test analysis to each section in the construction, and determines the main parameter and the secondary parameter which should be considered in the design, according to the parameter single factor sensitivity analysis, The real value of bulk density is obtained and the corresponding adjustment is made to ensure that the force state and the line shape of the bridge are basically consistent with the design state. The influence of the elastic modulus of concrete on the linear shape of the structure is the second, while the influence of bulk density and elastic modulus of concrete on the linear shape of the structure, the friction coefficient of the pipeline, the deviation coefficient of the pipeline and the humidity of the environment belong to the secondary parameters of the design. It has little effect on the alignment of the structure. Based on the single factor sensitivity analysis of parameters, a certain combination is selected to analyze the sensitivity of two factors, and the influence of each parameter combination on the structure alignment is studied tentatively.
【学位授予单位】：武汉理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U445.4;U448.23

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