基于影响矩阵法的斜拉桥成桥索力优化与合理施工状态研究

发布时间：2018-08-19 06:12

【摘要】：斜拉桥是由梁、塔、索三部分组成的组合体系桥梁,斜拉索作用到主梁上相当于对主梁提供了多点弹性支撑,这虽然改善了主梁的受力状态,增加了桥梁的跨越能力,但也使得斜拉桥成为高次超静定结构,对于设计计算更加复杂。斜拉索的张拉对整个斜拉桥的受力有很大的影响,而索力的大小通常是通过施工阶段多次调节确定的,如何合理的在施工阶段对索力进行张拉使斜拉桥最终达到合理的成桥状态已经成为斜拉桥设计中的关键。本文第1章先是对斜拉桥的发展历程进行了简单的概述,并对斜拉桥受力特点做了总结,最后对斜拉桥索力优化的研究现状进行了介绍,并提出本文研究的主要内容。第2章和第4章为理论研究部分,分别对成桥索力优化方法及合理施工状态确定方法进行了概括总结,并对影响矩阵原理进行了说明,最后介绍了基于影响矩阵理论的成桥索力优化与合理施工状态确定方法的实现过程。第3章和第5章是实例分析部分,先是以某独塔斜拉桥为例采用影响矩阵法对其进行合理成桥索力优化分析,优化结果与设计结果基本一致,验证了该方法的可行性;随后基于影响矩阵理论分别对采用满堂支架施工及悬臂浇筑施工的斜拉桥进行合理施工索力确定,结果表明按照确定的施工索力进行施工,最终成桥时能够得到合理成桥状态,同时各个施工阶段受力满足规定要求,最后对成桥运营阶段进行计算,运营期间受力满足要求。最后一章对本文的工作进行总结,并对本文未考虑的问题进行了归纳,同时对影响矩阵理论在其他桥型上的应用做了展望。
[Abstract]:Cable-stayed bridge is a composite system bridge composed of beam, tower and cable. The cable acts on the main girder and provides multi-point elastic support to the main girder. Although this improves the stress state of the main girder and increases the span capacity of the bridge, it also makes the cable-stayed bridge become a high-order indeterminate structure, which makes the design and calculation more complicated. Tension has a great influence on the force of the whole cable-stayed bridge, and the magnitude of the cable force is usually determined by many adjustments in the construction stage. How to reasonably stretch the cable force in the construction stage to make the cable-stayed bridge reach a reasonable state of completion has become the key in the design of the cable-stayed bridge. Chapter 2 and Chapter 4 are the part of theoretical research. They summarize the methods of cable force optimization and the methods of determining the reasonable construction state, and summarize the research status of cable force optimization of cable-stayed bridges. The principle of influence matrix is explained, and the realization process of optimizing cable force and determining reasonable construction state based on influence matrix theory is introduced. Chapters 3 and 5 are examples. First, an example of a single pylon cable-stayed bridge is taken to optimize the cable force of the bridge by using influence matrix method, and the optimizing results and setting are given. Based on the influence matrix theory, the reasonable construction cable forces of the cable-stayed bridges constructed by full support and cantilever casting are determined respectively. The results show that the construction can be carried out according to the determined construction cable forces, and the reasonable completion state can be obtained at the end of the bridge, at the same time, each construction stage. In the last chapter, the work of this paper is summarized, and the problems not considered in this paper are summarized. At the same time, the application of influence matrix theory in other bridge types is prospected.
【学位授予单位】：吉林大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U448.27

【相似文献】