刚构连续组合梁桥施工监控研究

发布时间：2018-06-04 21:46

本文选题：刚构连续组合梁桥 + 施工控制　；参考：《长沙理工大学》2014年硕士论文

【摘要】：随着连续梁桥结构体系的增多,桥梁跨越能力的不断提高,施工材料、机械、设备、技术等的不断更新与改进,我国的连续梁桥建设发展迅速。其中,刚构连续组合梁桥这种桥型,不仅在于综合了连续梁桥和连续刚构桥各自的优势,因受力介于连续梁桥和连续刚构桥之间,既可以增加桥梁跨径又能够适应矮墩等环境的限制等因素,受到了广泛的关注与应用。组合梁桥上部结构箱梁采用的是悬臂施工工艺,其施工难度大、施工节段多,周期长而且工艺复杂。我们必须施行严格的施工控制,确保桥梁上部结构在施工过程中,其内力和变形始终处于安全的范围内,且成桥后的线形、结构的受力状态接近设计期望。本文以湖南湘西自治州凤凰堤溪沱江大桥(重建)工程为工程背景,回顾该种桥型的发展历史和施工控制理论,运用BRanalysis和桥梁博士建立组合梁桥空间模型进行仿真分析,复核设计计算所确定的成桥状态和施工状态,并提出如下几点研究内容：1、以凤凰沱江大桥(重建)工程的实际状况为背景,就施工监控的基本控制理论、方法做详细介绍,并对其影响因素进行分析；2、沱江大桥3#桥墩采用的是扩大基础,其他桥墩均采用桩基础,为确保施工安全,对扩大基础的稳定性进行系统的验算,并分析其设计的合理性；3、以沱江大桥为背景,建立有限元模型。悬臂施工中,施工监控重点监控主梁的线形和内力,在对比理论计算值与现场实测值的基础上分析主梁在收缩徐变、浇筑、张拉等典型工况下挠度与应力的变化规律；4、因各方面的原因,沱江大桥次边跨合龙前已经拆除了1#墩的临时固结,且施工了一部分的人行道板,对施工控制工作带来了很大难度。针对沱江大桥的实际施工情况,考虑桥梁的安全、线形、结构内力等因素,分析最合适的拆除临时固结时间和合龙方案。
[Abstract]:With the increasing of continuous beam bridge structure system, the continuous improvement of bridge span capacity, the continuous renewal and improvement of construction materials, machinery, equipment and technology, the construction of continuous beam bridge in China is developing rapidly. Among them, rigid frame continuous composite beam bridge not only combines the advantages of continuous beam bridge and continuous rigid frame bridge, but also has the force between continuous beam bridge and continuous rigid frame bridge. It can not only increase the span of bridges but also adapt to the environmental constraints such as short piers, and has been widely concerned and applied. The superstructure box girder of composite girder bridge adopts cantilever construction technology, which is difficult to construct, has many construction sections, long period and complex technology. We must carry out strict construction control to ensure that the internal force and deformation of the superstructure of the bridge are always in the safe range during the construction process, and the line shape after the completion of the bridge, the stress state of the structure is close to the design expectation. Based on the project of Fenghuangdixi Tuojiang River Bridge in Xiangxi Autonomous Prefecture of Hunan Province, this paper reviews the development history and construction control theory of this type of bridge, and establishes the spatial model of composite beam bridge by using BRanalysis and the bridge doctor to carry out simulation analysis. Reviewing the bridge status and construction state determined by design calculation, and putting forward the following research contents: 1. Based on the actual situation of Phoenix Tuojiang Bridge (reconstruction) project, the basic control theory and method of construction monitoring are introduced in detail. In order to ensure the safety of construction, the stability of the enlarged foundation is systematically checked and calculated, and the pier of Tuojiang Bridge is based on the enlarged foundation, while the other piers are based on the pile foundation. The rationality of the design is analyzed and the finite element model is established based on the Tuojiang Bridge. In cantilever construction, the main beam is monitored and monitored by construction supervision and control. On the basis of comparing the calculated value of theory with the measured value on the spot, the shrinkage, creep and pouring of main beam are analyzed. For various reasons, the temporary consolidation of the pier of Tuojiang Bridge has been removed before the closure of the secondary side span of the Tuojiang Bridge, and a part of the sidewalk slab has been constructed. It brings great difficulty to the construction control work. In view of the actual construction of Tuojiang Bridge, considering the safety, alignment and internal force of the bridge, the most suitable temporary consolidation time and closure scheme are analyzed.
【学位授予单位】：长沙理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U445.4

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