混凝土拱桥扣索布置对悬浇拱圈力学影响分析研究

发布时间：2018-02-12 14:47

本文关键词： 钢筋混凝土拱桥悬臂浇筑扣锚系统扣索布置形式合理　出处：《重庆交通大学》2015年硕士论文　论文类型：学位论文

【摘要】：我国采用缆索吊装法和劲性骨架法修建了为数众多的大跨径混凝土拱桥,相比之下,国外混凝土拱桥大多采用悬臂浇筑施工法。鉴于悬臂浇筑法在山区拱桥建设中的优势,国内也已开展钢筋混凝土拱桥悬臂浇筑施工的理论研究和工程实践,至今已在四川和贵州共建成2座大跨度混凝土拱桥。悬臂浇筑施工中,扣锚系统的布置直接影响到主拱圈受力、扣锚索力值以及拱圈线形的控制,但目前缺乏对这方面的系统研究。为此,本文以贵州省交通运输厅科技项目“挂篮悬浇钢筋混凝土箱形拱桥设计与施工关键技术研究”为依托,以木蓬特大桥为研究对象,围绕扣锚系统开展以下研究:①收集国内外钢筋混凝土拱桥采用悬臂浇筑施工的扣锚系统构造,将扣锚系布置归结为扇形布置和星式布置两种形式。②根据混凝土拱桥主拱圈在悬臂浇筑施工过程中的受力与变形特点,在分析比较国内各种施工控制方法的基础上,给出了用应力平衡法计算扣锚索力的算法和计算流程。③针对星式和扇形两种扣锚索布置方式,分别拟定了木蓬特大桥以最大悬臂端扣索取15°、17°、20°、23°的布索方案,开展主拱圈施工阶段的截面应力和变形的对比分析研究。④计算结果表明,位于拱脚区段的扣索,扣索倾角不宜过大,以确保节段混凝土浇筑时在拱圈截面中产生压应力;对其他扣索布置,结合拱圈截面的受力和线形控制分析,扇形扣索布置中最长扣索水平倾角20°较为合理,星式扣索布置中最长扣索的的水平倾角17°较为合理。
[Abstract]:China adopts the cable hoisting method and stiff skeleton method for construction of long span concrete arch bridge, a large number of contrast, most of the foreign concrete arch bridge cantilever construction method. In view of the advantages of cantilever casting method in arch bridge construction in mountainous area, theoretical research and engineering practice in China has developed the reinforced concrete arch bridge cantilever construction and has been in Sichuan and Guizhou built a total of 2 long-span concrete arch bridge cantilever construction, anchor system layout directly affects the main arch force, buckle anchor force value and control of arch linear, but there is lack of systematic research in this area. Therefore, the science and technology project of Guizhou the Provincial Department of transportation suspending cast reinforced concrete box arch bridge design and construction of key technology research "as the basis, to Mu Peng super large bridge as the research object, the anchor system carries out the following research: 1. Collection Set of reinforced concrete arch bridge with anchor system structure of cantilever construction, the anchor arrangement due to the layout and arrangement of two star fan forms. According to the main arch concrete arch bridge in cantilever construction process of the stress and deformation characteristics, based on comparison of domestic construction control methods on the analysis are given the stress calculation algorithm and calculation process. According to the anchor force buckle and buckle two star fan cable arrangement, were developed in the largest cantilever Mu Peng super large bridge buckle for 15 degrees, 17 degrees, 20 degrees, 23 degrees to carry out the project of laying, section of the main arch ring construction stage should be studied analysis of stress and deformation. Compared the calculation results show that in the arch of the foot section of the cable, cable angle should not be too large, to ensure that the segmental concrete pouring in the arch section in compressive stress; on the other cable layout, combination Analysis of force and alignment control of arch ring section, fan-shaped cable layout in the length of cable horizontal angle of 20 degrees is reasonable, star cable layout of the longest cable angle of 17 degrees is more reasonable.

【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U448.22

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