自锚式悬索桥体系转换控制及索力识别研究
发布时间：2018-09-14 15:47
【摘要】：自锚式悬索桥由于具有造型美观、对地形适应能力强以及在一定跨度范围内费用较低等特点，在近年来应用越来越加广泛。自锚式悬索桥先梁后缆的施工顺序使得体系转换成为了施工过程中的关键阶段。虽然到目前为止国内外已经建成了多座自锚式悬索桥，但是体系转换特别是其中的吊索张拉过程仍然没有一个统一的可遵循的方法，仍需要针对于某一桥梁制定出特有的吊索张拉方案，有必要去对这一方面进行研究。 本文所依托的工程为吉林市雾凇自锚式悬索桥，对其整个体系转换过程进行分析控制。确定出张拉方案，首先是要给出合理的成桥状态，计算出成桥主缆线形，主缆无应力长度，成桥索力等。在雾凇大桥的体系转换过程中，对主缆的线形，主塔塔顶的偏位，，主梁的线形，吊索的索力以及主塔和主梁的应力状况进行了监控，通过对监控数据的分析和计算，掌握了桥梁在体系转换过程中的内力变化和线形变化，保证体系转换过程的安全并根据实测数据对吊索张拉方案进行优化调整。 在施工过程中，要能够快速准确的获取吊索的索力值，对现有的吊索索力公式进行对比和分析发现误差仍然比较大，需要研究适用于自锚式悬索桥的吊索索力公式。在根据弦理论和梁理论所推导出的吊索索力公式的基础上，分析了三段均匀吊索索力振动模型计算的可行性，引入了吊索长度修正系数的概念对吊索的索力公式进行了修正，运用该公式通过实测频率和千斤顶张拉的吊索索力真实值对比，证明修正公式的结果满足工程需要。
[Abstract]:Self-anchored suspension bridge is more and more widely used in recent years because of its beautiful shape, strong adaptability to terrain and low cost in a certain span range. The sequence of construction of self-anchored suspension bridge makes the system transformation into a key stage in the construction process. Although many self-anchored suspension bridges have been built at home and abroad so far, there is still no uniform method to follow in the system transformation, especially in the process of sling tension. It is still necessary to make a special sling tension scheme for a certain bridge, so it is necessary to study this aspect. The project supported in this paper is the rime self-anchored suspension bridge in Jilin city, and the whole system transformation process is analyzed and controlled. The first step in determining the tension scheme is to give a reasonable state of the bridge, calculate the main cable shape, the length of the main cable without stress, and the cable force of the bridge. In the process of system transformation of the rime bridge, the alignment of the main cable, the deflection of the top of the main tower, the alignment of the main girder, the cable force of the slings and the stress of the main tower and the main beam are monitored and monitored, and the monitoring data are analyzed and calculated. The change of internal force and line shape of bridge in the process of system transformation is grasped to ensure the safety of system transformation process and the sling tensioning scheme is optimized and adjusted according to the measured data. In the process of construction, in order to obtain the cable force value quickly and accurately, by comparing and analyzing the existing cable force formula, it is found that the error is still relatively large, so it is necessary to study the cable suspension force formula suitable for self-anchored suspension bridge. Based on the formula of cable force derived from string theory and beam theory, the feasibility of calculating the vibration model of three-stage uniform cable suspension force is analyzed. The concept of cable length correction coefficient is introduced to modify the cable force formula of sling. By comparing the measured frequency with the real value of the cable force of the Jack, it is proved that the result of the modified formula can meet the need of the project.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U448.25
本文编号：2243149
[Abstract]:Self-anchored suspension bridge is more and more widely used in recent years because of its beautiful shape, strong adaptability to terrain and low cost in a certain span range. The sequence of construction of self-anchored suspension bridge makes the system transformation into a key stage in the construction process. Although many self-anchored suspension bridges have been built at home and abroad so far, there is still no uniform method to follow in the system transformation, especially in the process of sling tension. It is still necessary to make a special sling tension scheme for a certain bridge, so it is necessary to study this aspect. The project supported in this paper is the rime self-anchored suspension bridge in Jilin city, and the whole system transformation process is analyzed and controlled. The first step in determining the tension scheme is to give a reasonable state of the bridge, calculate the main cable shape, the length of the main cable without stress, and the cable force of the bridge. In the process of system transformation of the rime bridge, the alignment of the main cable, the deflection of the top of the main tower, the alignment of the main girder, the cable force of the slings and the stress of the main tower and the main beam are monitored and monitored, and the monitoring data are analyzed and calculated. The change of internal force and line shape of bridge in the process of system transformation is grasped to ensure the safety of system transformation process and the sling tensioning scheme is optimized and adjusted according to the measured data. In the process of construction, in order to obtain the cable force value quickly and accurately, by comparing and analyzing the existing cable force formula, it is found that the error is still relatively large, so it is necessary to study the cable suspension force formula suitable for self-anchored suspension bridge. Based on the formula of cable force derived from string theory and beam theory, the feasibility of calculating the vibration model of three-stage uniform cable suspension force is analyzed. The concept of cable length correction coefficient is introduced to modify the cable force formula of sling. By comparing the measured frequency with the real value of the cable force of the Jack, it is proved that the result of the modified formula can meet the need of the project.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U448.25
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