钢箱拱肋安装偏差处治措施研究

发布时间：2018-09-19 09:46

【摘要】：本文以一座提篮式钢箱肋拱桥作为工程背景,利用Midas/civil以及Midas/FEA作为有限元分析软件进行拱肋的整体和局部建模分析,研究了钢箱拱肋接缝偏差(错台)对结构内力(特别是局部应力)以及变形的影响；同时分析讨论了钢箱拱肋接缝偏差(错台)的2种处治措施的有效性和他们各自的优缺点,所取得的成果为以后同类型桥梁的类似问题的评估、处治设计和施工具有重要的指导意义。主要内容以下：(1)利用有限元分析程序Midas建立钢箱拱桥空间梁单元有限元模型和局部拱肋板单元模型；(2)分析了上述模型在各分项荷载及荷载组合作用下内力、应力及位移特性；(3)对比分析了错台对拱肋的局部应力及变形所产生的影响；(4)讨论了2种错台补强措施的有效性和它们各自的优缺点。计算结果表明,在一期荷载作用和成桥阶段,错台对结构轴力、弯矩影响较小,但对结构应力影响较大,造成应力集中,接缝截面应力相应增大。加劲肋和加劲板对接缝错台均有补强作用,但加劲肋的补强效果远不如加劲板。若错台比较严重,可以考虑使用加劲板补强法。但加劲板补强法对施工工艺要求较高,若施工水平低下,对补强效果有较大的影响。
[Abstract]:In this paper, a basket-type steel box rib arch bridge is used as the engineering background, and Midas/civil and Midas/FEA are used as the finite element analysis software to model and analyze the whole and local arch rib. In this paper, the influence of steel box arch rib joint deviation (staggered platform) on the internal force (especially local stress) and deformation of steel box arch rib joint is studied, and the effectiveness of two treatment measures of steel box arch rib joint deviation (staggered platform) and their respective advantages and disadvantages are analyzed and discussed. The results obtained are of great significance for the evaluation of similar problems of the same type of bridges in the future and for the treatment of design and construction. The main contents are as follows: (1) the finite element model of space beam element of steel box arch bridge and the local arch ribbed plate element model are established by using finite element analysis program Midas; (2) the internal force of the above model under the action of each component load and load combination is analyzed. (3) the effect of staggered platform on the local stress and deformation of arch rib is compared and analyzed. (4) the effectiveness of two kinds of reinforcement measures for staggered platform and their respective advantages and disadvantages are discussed. The results show that the stagger has little effect on the axial force and bending moment of the structure in the first stage of loading and bridge formation, but it has a great effect on the stress of the structure, resulting in the stress concentration, and the stress of the joint section increases accordingly. Both stiffener and stiffener have reinforcing effect, but the effect of stiffener is not as good as stiffener. If the stagger is more serious, you can consider using stiffener reinforcement method. However, the reinforcement method of stiffening plate has a high requirement on the construction technology, and if the construction level is low, it will have a great effect on the reinforcement effect.
【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】：U445.4

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