独塔斜拉桥主梁施工控制技术研究

发布时间：2019-01-17 18:56

【摘要】：独塔斜拉桥技术含量高,施工难度大,主梁的施工控制问题是保证斜拉桥达到合理成桥状态的关键。由于独塔斜拉桥具有较好的受力性能和良好的抗收缩徐变能力,同等条件下,独塔斜拉桥与双塔斜拉桥相比不仅可以省掉一个基础,还可以通过设置较长的无索区大幅减少拉索用量,经济性能优越。本论文以新井冈山大桥工程为背景,通过新井冈山大桥三维空间有限元模型的建立,重点研究了钢主梁悬拼过程中的结构内力及斜拉索索力的施工控制问题。同时,对桥梁结构参数的敏感性也进行了分析探讨,主要研究内容如下:(1)结合独塔斜拉桥施工监控的内容、方法以及原则,选用桥梁分析计算软件-Midas/Civil,分别模拟了新井冈山大桥施工过程中钢主梁、斜拉索的受力情况,验证了该有限元模型在实际工程中的适用性。(2)选用Midas/Civil软件,采用正装法对钢主梁悬臂拼装过程进行仿真模拟分析,得出施工过程中钢主梁内力分布不利位置,以及最大施工荷载对钢主梁内力分布不利位置的影响。(3)以频率法为基础,采用有限元计算软件,分析了单根斜拉索损伤对自身索力值的影响,及对其它斜拉索受力状态的影响,进而得出了单根斜拉索索力值调整对其它斜拉索索力值的影响规律。(4)通过有限元计算软件,分析了温度荷载、施工荷载、斜拉索索力值等主要参数的敏感性,比较了敏感性变化对斜拉桥主梁线形和斜拉索索力的影响情况,为有限元基本参数的选取打下了基础。
[Abstract]:Single tower cable-stayed bridge has high technical content and construction difficulty. The construction control of main girder is the key to ensure the cable-stayed bridge to reach a reasonable state of completion. Because the single tower cable-stayed bridge has better mechanical performance and good anti-shrinkage and creep ability, under the same conditions, the single-tower cable-stayed bridge can not only save a foundation compared with the double-tower cable-stayed bridge. Can also set a longer cable-free area significantly reduce the amount of cable, superior economic performance. This paper takes the new Jinggangshan Bridge as the background, through the establishment of the three-dimensional finite element model of the New Jinggangshan Bridge, focuses on the construction control of the structural internal force and the cable-stayed cable force in the process of the steel main beam hanging and assembling. At the same time, the sensitivity of bridge structural parameters is analyzed and discussed. The main research contents are as follows: (1) combined with the content, method and principle of single tower cable-stayed bridge construction monitoring, the bridge analysis and calculation software-Midas/Civil, is selected. The stress situation of steel main beam and cable during the construction of Xinjinggangshan Bridge is simulated, and the applicability of the finite element model in practical engineering is verified. (2) Midas/Civil software is selected. The steel main girder cantilever assembly process is simulated and analyzed by using the straight fitting method, and the unfavorable position of the internal force distribution of the steel main girder is obtained during the construction process. And the influence of maximum construction load on the unfavorable position of internal force distribution of steel main girder. (3) based on the frequency method, the influence of single cable damage on its own cable force is analyzed by using finite element calculation software. And the influence on the stress state of other cable-stayed cables, and the influence law of the adjustment of the single cable force on the other cable-stayed cable forces is obtained. (4) through the finite element calculation software, the temperature load and the construction load are analyzed. The sensitivity of the main parameters, such as cable force value, is compared, and the influence of the change of sensitivity on the line shape and cable force of the main girder of cable-stayed bridge is compared, which lays a foundation for the selection of the basic parameters of the finite element method.
【学位授予单位】：湖北工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U445.4;U448.27

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