逐跨施工连续梁桥施工过程分析

逐跨施工连续梁桥施工过程分析(任务书,开题报告,论文12900字)
摘要
逐跨施工的连续梁桥在施工过程中会出现体系转换的问题，即由静定体系转换为超静定体系，由悬臂体系转换为连续梁体系。所以在设计阶段要考虑不同施工方法对梁体的内力和变形产生的影响，有时甚至需要以施工阶段的某一过程作为控制设计。因此本文运用结构力学的基本原理，围绕连续梁桥在逐跨施工过程中的内力变化和位移变化进行分析。以三跨连续梁为基本模型，先进行手工的代数式计算，再用ANSYS软件对三跨连续梁实例进行建模计算，得出逐跨施工各个过程中梁各点的弯矩值和挠度值，并将计算结果叠加，得出成桥后的弯矩图和各点挠度值。完成后将逐跨施工法得到的弯矩图与一次落架法得到的弯矩图进行对比，了解逐跨施工法对成桥内力及挠度的影响。最后计算得出三跨连续梁桥在逐跨施工条件下的恒载挠度值。
中文关键字：连续梁桥；逐跨施工；ANSYS；结构计算；线形控制

Abstract
The structure system of a concrete continuous girder bridge constructed by span by span construction method will transform in the process of the construction, that is to say, the statically determinate system will transform into the statically indeterminate system and the cantilever beam system will transform into the continuous beam system. In consequence, we should consider the influence on the internal force and the deformation of the beam in different construction method, sometimes we even need to take a certain stage of the construction as the control design. Thus this paper will use the basic principle of the structural mechanics to analyze the internal force and displacement changes in the process of step construction of the continuous girder bridge. With the three span continuous beam as the basic model, manual calculation in algebraic expression will be exerted first, and the ANSYS software will be used to set a model of a three span continuous beam engineering example to gain bending moment and deflection value of each point in the each process step construction. The calculated results will be superposed to gain the bending moment diagram and deflection value at various points of the finished bridge. After this step, bending moment diagram obtained by step construction method will be compared with the bending moment diagram obtained by the drop-frame method to illustrate influence of internal force and deflection caused by the span by span construction method. Finally, deflection value of the three span continuous girder bridge subjected to dead load will be calculated under the condition of step construction.
Keywords: continuous beam bridge；span by span construction method；ANSYS；structure analysis；bridge configuration control
 

目录
摘要    I
Abstract    II
第一章 绪论    1
1.1研究背景    1
1.2研究意义    1
1.3研究现状    2
1.4本文主要工作    3
1.5本章小结    3
第二章 连续梁桥逐跨施工方法    4
2.1总述    4
2.2逐跨施工法    4
2.2.1预制节段逐跨拼装法    4
2.2.2移动支架逐孔现浇法    5
2.3本章小结    6
第三章 连续梁逐跨施工过程分析    7
3.1总述    7
3.2手算过程    7
3.2.1施工的第一阶段    8
3.2.2施工的第二阶段    8
3.2.3施工的第三阶段    10
3.2.4施工的第四阶段    12
3.3成桥弯矩    13
3.4与采用一次落架法施工得到的成桥弯矩对比    14
3.5本章小结    16
第四章 连续梁桥内力分布的其他影响因素    17
4.1影响因素    17
4.2支座位移引起的梁体弯矩    17
4.3温度变化引起的弯矩    18
4.4本章小结    20
第五章 三跨连续梁桥实例分析    21
5.1三跨连续梁实例的设计资料    21
5.2ANSYS模型的建立    21
5.2.1施工的第一阶段    21
5.2.2施工的第二阶段    23
5.2.3施工的第三阶段    25
5.2.4施工的第四阶段    27
5.3手算结构与电算结果对比    29
5.4本章小结    32
第六章 三跨连续梁桥的挠度    33
6.1综述    33
6.2三跨连续梁的恒载挠度计算    33
6.3本章小结    37
第七章 结论与展望    38
7.1本文结论    38
7.2本文展望    38
参考文献    40
致谢    41