嘉陵江特大桥预应力混凝土连续梁施工线形控制研究

发布时间：2018-05-20 07:37

本文选题：高速铁路 + 连续梁桥　；参考：《兰州交通大学》2015年硕士论文

【摘要】：近年来,随着我国经济的迅速增长,促进了我国铁路交通事业的飞速发展,同时也促进了高速铁路预应力混凝土连续梁桥的飞速发展。这类桥梁的结构具有成本低,施工速度快,结构刚度高等优点,具有足够的强度和刚度,以确保高速列车顺利通过。当前,国内外连续梁桥的施工方法多选用悬臂浇筑法。在悬臂浇筑的施工过程当中,主梁要经历一个复杂多变的受力过程。同时,在整个施工过程当中有一系列的因素影响着主梁的受力情况、位移情况和结构内部温度情况。这些因素都会对桥梁的强度、刚度和耐久性产生较大的影响。为了确保该连续梁能够达到预期的工程质量要求,主梁的施工线形控制是必不可少的。本文在概括国内外预应力混凝土连续梁桥发展和施工控制技术发展趋势的基础上,对预应力混凝土连续梁桥的施工控制技术进行了研究。阐述了施工控制的内容和方法,以及施工控制中几个关键问题。本研究课题以嘉陵江特大桥预应力混凝土连续梁桥为工程背景,依据预应力混凝土连续梁桥的施工控制的特征,建立了全面的监测系统。在研究过程当中,运用计算软件MIDAS/CIVIL对该连续梁的主梁施工过程进行模拟分析。同时,在施工控制过程当中,成功采集了9#墩、10#墩的0#块~7#块的挠度监测和0#块3#截面的应力监测数据,并对这些数据与理论数据进行了分析对比,虽然实测数据与理论数据有误差,但这些误差都在可控的范围之内从而说明结构的整体性能和工作情况良好。进而为以后桥梁的健康监测提供参考和借鉴。
[Abstract]:In recent years, with the rapid growth of China's economy, it has promoted the rapid development of China's railway transportation, but also promoted the rapid development of high-speed railway prestressed concrete continuous beam bridge. The structure of this kind of bridge has the advantages of low cost, fast construction speed and high structural stiffness, so it has enough strength and stiffness to ensure the smooth passage of high-speed train. At present, cantilever pouring method is often used in the construction of continuous beam bridge at home and abroad. In the construction process of cantilever pouring, the main beam has to undergo a complicated and changeable stress process. At the same time, there are a series of factors that affect the stress, displacement and temperature of the main beam during the whole construction process. These factors will have a great impact on the strength, stiffness and durability of the bridge. In order to ensure that the continuous beam can meet the expected engineering quality requirements, the construction alignment control of the main beam is essential. On the basis of summarizing the development trend of prestressed concrete continuous beam bridge at home and abroad and the development trend of construction control technology, the construction control technology of prestressed concrete continuous beam bridge is studied in this paper. This paper expounds the contents and methods of construction control and several key problems in construction control. Based on the engineering background of the prestressed concrete continuous beam bridge of Jialing River Bridge, a comprehensive monitoring system is established according to the characteristics of the construction control of the prestressed concrete continuous beam bridge. In the course of the research, the construction process of the main beam is simulated and analyzed by using the calculation software MIDAS/CIVIL. At the same time, during the construction control process, the deflection monitoring data and the stress monitoring data of the 0# block of Chu10# pier are collected successfully, and the data are analyzed and compared with the theoretical data. Although there are errors between the measured data and the theoretical data, these errors are within a controllable range, which shows that the overall performance and working conditions of the structure are good. Then it can provide reference and reference for the health monitoring of bridges in the future.
【学位授予单位】：兰州交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U445.4

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