【作者】 韩冰；

【导师】 季文玉；

【作者基本信息】 北京交通大学 ， 桥梁工程， 2009， 硕士

【摘要】 自改革开放以来,我国的桥梁事业发展迅猛,不仅提高了人民的生活质量,也在当前全球经济低迷的形势下为经济的复苏注入了活力。在众多的桥梁结构中,预应力混凝土连续刚构桥以其自身的优点,尤其受到设计师们的青睐。大跨度预应力混凝土连续刚构桥常常采用对称悬臂浇筑法施工。在悬臂施工过程中,桥梁结构受多种因素的影响,如混凝土的收缩和徐变、设计参数与实际数值的差异、施工误差、测量误差、温度变化等。因此采用悬臂浇筑法施工必然给桥梁结构带来非常复杂的内力和位移变化。为了保证桥梁施工质量和桥梁建设安全,确保连续梁桥成桥后的主梁线形和结构内力符合设计要求,使连续刚构桥的实际状态与设计状态尽可能相符,桥梁施工控制是不可缺少的。本文以温福铁路客运专线田螺大桥作为工程背景,对该桥悬臂浇筑施工过程进行了线形控制和应力控制研究,对施工控制理论在工程实践中的具体运用进行了详细的分析,采用大型计算软件MIDAS/CIVIL对全桥进行了仿真模拟分析,计算得出了成桥阶段的内力,并对大桥进行了稳定性分析。在线形控制中,通过对模型分析计算,得到了施工预拱度与成桥预拱度值,提出了立模标高的计算公式,从合拢结果来看达到了设计的线形,说明了计算结果的正确性。在应力控制中,由模型计算得到了施工各阶段的箱梁理论应力值,经过比较分析,实测应力值与理论应力值基本吻合,达到了对该桥应力控制的目。并且分析了混凝土收缩徐变效应,对由收缩徐变引起的挠度和内力进行了计算,且通过不同的计算模型和不同的时间点分别进行了对比;还讨论了收缩徐变效应的影响因素。更多还原

【Abstract】 Due to the Reform and opening-up, the rapid development of the national bridge construction in our country not only improve the quality of people’s life, but also infuse vigor and enthusiasm into the recovery of national economy in the current situation of the global economic downturn. In the large number of bridge structures, in particular, the pre-stressed concrete continuous rigid-frame bridge with its own characteristics is given much favor by designers.The long-span prestressed concrete continuous rigid-frame bridge adopts symmetrical cantilever pouring construction often. During the process of the balanced cantilever construction, the bridge structure is influenced by various factors, such as shrinkage, creep and temperature change of concrete, design parameter and actual difference, construction error, survey error and so on. Adopting the cantilever pouring construction like this must result in very complicated change of the internal forces and displacements in the bridge. In order to guarantee that the construction quality of the bridge and bridge construction are safe, and ensure that the main girder line shape after the continuous beam bridge is completed and structure internal force accords with the designing requirement, and make the real state that just constructed the bridge in succession rigid-frame conform with the designed state as much as possible, it is indispensable that the bridge construction control is done.This text, on the basic of the construction of Tianluo Bridge of Wen Zhou-Fu Zhou Railway Passenger Dedicated Line, has studied the process of the linearity control and the stress control in this bridge cantilever pouring construction, to analyze in detail the exertion of the control theory in the project practice. We apply large-scale calculation software MIDAS/CIVIL in the bridge to imitate and analyze the cantilever segmental construction, to adjust and control each construction stage. In the line shape control, through simulation analyzing and calculation, we can gained pre-camber of construction and pre-camber of completed stage, and propose the calculation elevation formula of the elevation of the form board, to achieve the design linearity through the closure result. In the stress control, we can calculate to gain the box girder theory stress in each constructing stages by the model, through coMParative analysis, it is identical basically to survey stress value and theory stress value, to achieve the purpose of the stress control in this bridge. And the factors which influence the alignment control of PC continuous rigid frame bridges, such as concrete creep and shrinkage, jacking force, age difference, are analyzed. The application of "Adaptive Control" theory in construction control is discussed. The data of stress measurement is analyzed based on the concrete creep and shrinkage theory.更多还原