特大跨度钢筋混凝土拱桥拱上建筑构造形式研究

发布时间：2018-08-10 18:33

【摘要】：随着设计理论、建筑材料与施工技术的进步,混凝土拱桥、钢管混凝土拱桥和钢拱桥都得到了快速发展。近年来,日本、克罗地亚以及欧洲一些知名国际公司相继开展了600m～1000m级特大跨径钢筋混凝土拱桥试设计研究。由于拱上建筑构造与布置直接影响到主拱圈内力和线形,因此本文以600m跨钢筋混凝土拱桥为工程背景,开展特大跨径钢筋混凝土拱桥拱上建筑构造与布置形式研究： ①收集整理国内外大跨径、特大跨径钢筋混凝土拱桥拱上建筑构造形式的资料,分析腹孔跨径布置的影响因素； ②设计了拱上建筑为连续梁-连续刚构、交界墩T形刚构、拱顶段整体现浇、桥道梁为钢-混组合结构和拱上建筑全为钢-混组合结构五种形式,分别拟定了各自的截面形式和跨径布置； ③围绕上述五种拱上建筑布置方案,采用有限元软件ANSYS开展主拱圈合理拱轴系数分析,在此基础上计算分析不同形式的拱上建筑对内力、位移以及稳定性等影响规律； ④针对每一种拱上建筑形式,提出特大跨径钢筋混凝土拱桥拱上建筑合适的结构类型和腹孔跨径布置方案； ⑤分析比较五种不同拱上建筑形式在自重作用下和静风作用下的稳定性能,判定特大跨径钢筋混凝土拱桥的失稳模态； ⑥随着拱上建筑的不断加载,主拱圈截面发生转角位移,由于特大跨径拱桥靠近拱脚截面的立柱高度大而导致立柱也会发生较大偏位,因此,为了保证立柱成桥后的垂直度,在施工过程须预偏立柱。
[Abstract]:With the development of design theory, building materials and construction technology, concrete arch bridges, concrete filled steel tubular arch bridges and steel arch bridges have been developed rapidly. In recent years, some famous international companies in Japan, Croatia and Europe have carried out the trial design research of 600-1000m super-long span reinforced concrete arch bridges. The internal force and alignment of the main arch ring are directly affected by the arrangement of the arch ring. In this paper, 600 m-span reinforced concrete arch bridge is taken as the engineering background to carry out the research on the arch structure and layout of the super-long-span reinforced concrete arch bridge.
(1) Collect and collate the data of the arch structure of large-span and extra-long-span reinforced concrete arch bridges at home and abroad, and analyze the influencing factors of the abdominal span layout;
(2) Five kinds of structures, including continuous beam-continuous rigid frame, T-shaped rigid frame of junction pier, integral cast-in-place of arch top, steel-concrete composite structure of bridge girder and steel-concrete composite structure of arch structure, are designed, and their cross-section forms and span arrangements are worked out respectively.
(3) Around the above-mentioned five kinds of arch building layout schemes, the finite element software ANSYS is used to analyze the rational arch axis coefficient of the main arch ring, and on this basis, the influences of different types of arch buildings on internal force, displacement and stability are calculated and analyzed.
(4) For each type of arch structure, the appropriate structure type and the layout scheme of the abdominal span are proposed for the arch structure of the extra-long-span reinforced concrete arch bridge.
_By analyzing and comparing the stability performance of five different arch structures under the action of gravity and static wind, the instability modes of super-long-span reinforced concrete arch bridges are determined.
_With the continuous loading of arch buildings, the main arch ring section occurs angular displacement, because the height of the column near the arch foot section of the super-long-span arch bridge will lead to larger column deviation, therefore, in order to ensure the verticality of the column after completion of the bridge, it is necessary to pre-deflect the column in the construction process.
【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】：U448.22

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