花鱼洞大桥加固关键技术研究

发布时间：2018-07-09 21:55

本文选题：桁式组合拱桥 + 结构性能　；参考：《重庆交通大学》2014年硕士论文

【摘要】：桁式组合拱桥作为20世纪80年代我国自主研发的一种新桥型,以其相对于其他桥型具有施工简单、造价低廉等突出优点,近20年来得到迅速的发展。但是,在桁式组合拱桥的使用、推广过程中发现,已建成的桁式组合拱桥在杆件节点部位和空实腹联接部位都不同程度地出现裂缝,特别是新拱脚和双竖杆部位,个别桥梁也因刚度不够而出现跨中挠度偏大的情况。本文首先结合桁式组合拱桥的结构特点、施工特点、受力特点和病害特点进行分析研究。对已建桁式组合拱桥特点进行分析,总结出桁式组合拱桥的结构、施工、受力、病害等特点。并对桥梁现有加固方法进行分析与评价。接着通过对桥梁现有加固方法的分析评价,结合桁式组合拱桥的特点,制定了桥梁维修加固技术研究原则,同时对桁式组合拱桥的上弦、下弦、实腹段、竖杆和斜杆分别进行维修加固技术分析研究。并对各个附属设施分别进行维修加固技术分析研究。然后根据造成桥梁整体性差的原因,分别采取了针对性分析研究,找出切实、可行的解决措施。并分别从技术可行性、加固效果、施工可行性和经济性,提出了桁式组合拱桥预应力加固与桥面板置换技术的可行性研究方案。论文最后以花鱼洞大桥为加固应用实例,运用桁式拱桥加固关键技术的研究成果,加固依托工程,对比分析了桥梁加固前后结构状况,说明加固方法合理可行、加固效果明显。总结了全文理论以及模型识别结果,并对桁式拱桥加固关键技术的发展前景进行了展望。
[Abstract]:Truss arch bridge is a new type of bridge developed independently in China in 1980s. Compared with other bridges, truss arch bridge has been developed rapidly in recent 20 years because of its advantages of simple construction and low cost. However, in the application of truss composite arch bridge, it is found that the cracks of the truss composite arch bridge, especially the new arch foot and the double vertical bar, appear in different degrees in the joint part of the member and the hollow and solid web connection. Individual bridges also have large midspan deflection due to insufficient stiffness. In this paper, the structural characteristics, construction characteristics, stress characteristics and disease characteristics of truss composite arch bridge are analyzed and studied. The characteristics of truss composite arch bridge are analyzed, and the structure, construction, force and disease of truss composite arch bridge are summarized. The existing reinforcement methods are analyzed and evaluated. Then, through the analysis and evaluation of the existing reinforcement methods of the bridge, combined with the characteristics of the truss composite arch bridge, the research principles of the bridge maintenance and reinforcement technology are established. At the same time, the upper chord, the lower chord, the real web section of the truss composite arch bridge are analyzed and evaluated. The maintenance and reinforcement technology of vertical rod and oblique rod are analyzed and studied respectively. The technical analysis of maintenance and reinforcement of each subsidiary facility is carried out respectively. Then, according to the causes of the poor integrity of the bridge, we take specific analysis and study to find out the practical and feasible solutions. From the aspects of technical feasibility, reinforcement effect, construction feasibility and economy, the feasibility study scheme of prestressed reinforcement and bridge deck replacement technology of truss composite arch bridge is put forward. Finally, taking Huayudong Bridge as an application example, using the research results of key reinforcement technology of truss arch bridge, strengthening and supporting engineering, the structure condition of bridge before and after reinforcement is compared and analyzed, which shows that the reinforcement method is reasonable and feasible, and the reinforcement effect is obvious. The theory and model recognition results are summarized, and the development prospects of key reinforcement techniques of truss arch bridge are prospected.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U445.72

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