大跨度铁路钢混结合梁斜拉桥施工控制及关键技术研究
发布时间：2018-09-08 11:10
【摘要】：钢混结合梁斜拉桥以独特的性能在国内被首次用于铁路建设中，斜拉桥承受列车活载远大于公路汽车荷载。故对铁路专用钢混结合梁斜拉桥的施工控制显得尤为重要，一些关键的施工过程值得深入探讨研究，为今后同类型铁路斜拉桥施工积累宝贵经验。论文以某铁路特大桥工程施工为研究背景，，采用有限元分析软件Midas和Ansys对本桥进行了以下研究： 1、研究在成桥状态下斜拉桥主梁段和索塔的应力分布情况，确定斜拉索的初拉力和成桥状态下斜拉索的索力，验证了主梁、主塔设计和斜拉索索力大小分布的合理性；基于钢箱梁梁上运梁法，研究在施工阶段中主梁的上下缘应力最大值与最小值和斜拉索索力最大值与最小值，从而确定最大值出现的施工阶段和位置。 2、采用Midas有限元软件分析承台大体积混凝土内部的温度状况，选择典型的测点为研究对象，分析在水平方向和竖直方向上承台内部的温度梯度关系，和加设冷管前后对承台温度的影响，描述了承台温度对冷管直径和水流量的敏感性情况。 3、在施工过程中超高索塔会出现较大的悬臂段，采用Midas有限元软件对索塔施工过程进行模拟分析，针对施工过程中出现的一些不利因素采取相应的控制措施来改善悬臂施工对索塔产生的影响。 4、采用Midas软件对索塔与下横梁采取同步施工还是异步施工进行了对比分析。 5、索塔钢锚箱是斜拉桥中一个关键特殊部位，它的质量如何决定斜拉桥后期的使用效果。在斜拉索索索力最大的情况下，分别采用Midas和Ansys有限元软件对钢锚箱进行建模分析，将结果进行比较，分析钢锚箱各主要组成部分的应力分布情况。
[Abstract]:Cable-stayed bridges with steel-concrete composite beams have been used in railway construction for the first time in China because of their unique performances, and the live loads of the trains are much greater than those of the highway vehicles. Based on the construction of a railway super-large bridge as the research background, the paper uses the finite element analysis software Midas and Ansys to study the bridge as follows:
1. Study the stress distribution of the main girder and pylon of the cable-stayed bridge in the completed state, determine the initial tension of the cable and the cable force of the cable in the completed state, verify the rationality of the girder, the design of the main pylon and the distribution of the cable force of the cable in the completed state. The maximum value and minimum value of cable force and the maximum value and minimum value of cable force can be used to determine the construction stage and location of the maximum value.
2. Using Midas finite element software to analyze the internal temperature of mass concrete cap, select typical measuring points as the research object, analyze the temperature gradient relationship in the horizontal and vertical direction of cap, and the influence of cold pipe on cap temperature before and after installing cold pipe, describe the sensitivity of cap temperature to cold pipe diameter and water flow rate. Condition.
3. Large cantilever section will appear in the construction process of super-high pylon. Midas finite element software is used to simulate and analyze the construction process of pylon. Corresponding control measures are taken to improve the influence of cantilever construction on pylon.
4, the Midas software is used to compare and analyze the synchronous construction of the pylon and the lower crossbeam or the asynchronous construction.
5. The steel anchor box of the pylon is a key special part of the cable-stayed bridge, and its quality determines the later service effect of the cable-stayed bridge. Condition.
【学位授予单位】：合肥工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U448.27
本文编号：2230349
[Abstract]:Cable-stayed bridges with steel-concrete composite beams have been used in railway construction for the first time in China because of their unique performances, and the live loads of the trains are much greater than those of the highway vehicles. Based on the construction of a railway super-large bridge as the research background, the paper uses the finite element analysis software Midas and Ansys to study the bridge as follows:
1. Study the stress distribution of the main girder and pylon of the cable-stayed bridge in the completed state, determine the initial tension of the cable and the cable force of the cable in the completed state, verify the rationality of the girder, the design of the main pylon and the distribution of the cable force of the cable in the completed state. The maximum value and minimum value of cable force and the maximum value and minimum value of cable force can be used to determine the construction stage and location of the maximum value.
2. Using Midas finite element software to analyze the internal temperature of mass concrete cap, select typical measuring points as the research object, analyze the temperature gradient relationship in the horizontal and vertical direction of cap, and the influence of cold pipe on cap temperature before and after installing cold pipe, describe the sensitivity of cap temperature to cold pipe diameter and water flow rate. Condition.
3. Large cantilever section will appear in the construction process of super-high pylon. Midas finite element software is used to simulate and analyze the construction process of pylon. Corresponding control measures are taken to improve the influence of cantilever construction on pylon.
4, the Midas software is used to compare and analyze the synchronous construction of the pylon and the lower crossbeam or the asynchronous construction.
5. The steel anchor box of the pylon is a key special part of the cable-stayed bridge, and its quality determines the later service effect of the cable-stayed bridge. Condition.
【学位授予单位】：合肥工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U448.27
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