多跨连续刚构桥施工稳定性分析及合龙方案研究
发布时间：2019-07-10 10:07
【摘要】：连续刚构桥以其行车平顺、伸缩缝少、受力合理、施工方便，同时具有良好的地形适应性与环境协调性而得到迅速发展，是我国广泛建设的桥型之一。随着该桥型桥墩高度、跨径、连续长度的不断增大，高墩也朝着薄壁轻型化的方向发展。由于墩高壁薄，高墩在施工过程中的稳定性问题日益突出。为保证施工阶段结构的安全，防止结构失稳，针对施工阶段对高墩进行稳定性分析是很有必要的。同时多跨连续刚构桥在合龙过程中，涉及到多次体系转换，而不同的体系转换方式对结构的受力、线形产生不同的影响。 本文以城川河大桥为工程背景，采用Midas/Civil有限元软件进行建模分析，主要研究内容与成果有： （1）分析了在不同荷载组合下该桥5号墩的自体稳定性、最大悬臂施工阶段稳定性及成桥后稳定性大小。结果表明在施工阶段与成桥稳定性均满足要求。 （2）针对该多跨连续刚构桥分别提出三种不同的合龙顺序，探讨了不同合龙顺序对结构的线形、应力、内力的影响，通过对比分析确定了先中跨、后边跨、再次边跨的合龙顺序。 （3）在此基础上，，分别考虑了合龙温差、收缩徐变对桥梁结构变形的影响。为减少其对结构产生的不利影响，可在连续刚构桥跨中合龙段梁体施加水平顶推力，使桥墩产生一定的预偏位移。本文分别提出三种施加顶推力的方案，就顶推位移量与顶推力的大小进行了分析，并推导了合龙温差与顶推力大小的关系式。结合工程实际情况，对比分析了不同顶推方案对结构的影响。
[Abstract]:Continuous rigid frame bridge has been developed rapidly because of its smooth driving, less expansion joints, reasonable force, convenient construction, and good topographic adaptability and environmental coordination. It is one of the bridge types widely built in our country. With the increasing height, span and continuous length of the bridge pier, the high pier is also developing towards the direction of thin-wall lightweight. Because of the thin high wall of the pier, the stability of the high pier in the construction process is becoming more and more prominent. In order to ensure the safety of the structure in the construction stage and prevent the instability of the structure, it is necessary to analyze the stability of the high pier in the construction stage. At the same time, the multi-span continuous rigid frame bridge involves many system transformation in the closing process, and different system transformation methods have different effects on the force and alignment of the structure. Based on the engineering background of Chengchuan River Bridge, this paper uses Midas/Civil finite element software to model and analyze. The main research contents and results are as follows: (1) the self stability of pier 5 under different load combinations, the stability of the maximum cantilever construction stage and the stability after completion of the bridge are analyzed. The results show that both the construction stage and the stability of the bridge meet the requirements. (2) three different closing sequences are put forward for the multi-span continuous rigid frame bridge, and the effects of different closing sequences on the alignment, stress and internal force of the structure are discussed. The closing sequence of the first middle span, the latter span and the second side span is determined by comparative analysis. (3) on this basis, the effects of closure temperature difference and shrinkage and creep on the deformation of bridge structure are considered respectively. In order to reduce its adverse effect on the structure, the horizontal top thrust can be applied to the beam body in the closure section of the continuous rigid frame bridge, so that the pier can produce a certain pre-offset displacement. In this paper, three schemes of applying top thrust are put forward, the displacement of top push and the magnitude of top thrust are analyzed, and the relationship between closure temperature difference and top thrust is deduced. Combined with the actual situation of the project, the influence of different push schemes on the structure is compared and analyzed.
【学位授予单位】：湘潭大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U445.4
[Abstract]:Continuous rigid frame bridge has been developed rapidly because of its smooth driving, less expansion joints, reasonable force, convenient construction, and good topographic adaptability and environmental coordination. It is one of the bridge types widely built in our country. With the increasing height, span and continuous length of the bridge pier, the high pier is also developing towards the direction of thin-wall lightweight. Because of the thin high wall of the pier, the stability of the high pier in the construction process is becoming more and more prominent. In order to ensure the safety of the structure in the construction stage and prevent the instability of the structure, it is necessary to analyze the stability of the high pier in the construction stage. At the same time, the multi-span continuous rigid frame bridge involves many system transformation in the closing process, and different system transformation methods have different effects on the force and alignment of the structure. Based on the engineering background of Chengchuan River Bridge, this paper uses Midas/Civil finite element software to model and analyze. The main research contents and results are as follows: (1) the self stability of pier 5 under different load combinations, the stability of the maximum cantilever construction stage and the stability after completion of the bridge are analyzed. The results show that both the construction stage and the stability of the bridge meet the requirements. (2) three different closing sequences are put forward for the multi-span continuous rigid frame bridge, and the effects of different closing sequences on the alignment, stress and internal force of the structure are discussed. The closing sequence of the first middle span, the latter span and the second side span is determined by comparative analysis. (3) on this basis, the effects of closure temperature difference and shrinkage and creep on the deformation of bridge structure are considered respectively. In order to reduce its adverse effect on the structure, the horizontal top thrust can be applied to the beam body in the closure section of the continuous rigid frame bridge, so that the pier can produce a certain pre-offset displacement. In this paper, three schemes of applying top thrust are put forward, the displacement of top push and the magnitude of top thrust are analyzed, and the relationship between closure temperature difference and top thrust is deduced. Combined with the actual situation of the project, the influence of different push schemes on the structure is compared and analyzed.
【学位授予单位】：湘潭大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U445.4
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