高铁大跨度单T刚构加劲钢桁组合梁研究

发布时间：2018-08-06 13:41

【摘要】：钢-混凝土组合结构是通过连接件把钢梁和混凝土板连接成整体而共同工作的受弯构件。在荷载作用下,混凝土板受压而钢梁受拉,充分发挥钢材与混凝土的材料特性。组合结构的发展为桥梁工程中一些技术难题的解决提供了全新的思路,它减轻了结构自重,使得桥梁的跨度变得更大,同时也提升了建筑物的抗震性能以及施工的经济效益,是桥梁工程发展的重要方向。在我国组合结构的应用日益广泛,其合理的力学性能和优良的技术经济指标使它在我国的应用有着长远的发展前景,随着试验研究的不断深入,可以预见组合结构将会继续发展,成为在传统混凝土结构和钢结构之后的主要应用于桥梁工程结构形式。本文针对高铁大跨度单T钢构加劲钢桁组合梁,研究其在列车荷载作用下钢混组合结构的力学性能。通过对钢混组合结构的力学研究,计算在各种工况下桥梁的受力特点,为桥梁的设计提供的依据。本课题重点研究的内容以及需要解决的关键问题主要为以下几个方面：(1)在分析现有钢混组合结构的理论基础上,建立完善的高铁大跨度单T钢构加劲钢桁组合梁力学分析模型。(2)借助Midas有限元软件,运用力学原理,确定高铁大跨度单T钢构加劲钢桁组合桥梁有限元模型,计算、对比、分析最优组合结构。(3)以新建大同至西安高速铁路晋陕黄河特大桥为实例,结合具体的施工情况,进行设计研究哪种组合结构能更高效、优质、经济的满足高铁规范。
[Abstract]:Steel-concrete composite structure is a kind of bending member which connects steel beam and concrete slab as a whole. Under the action of load, concrete slabs are subjected to compression and steel beams are subjected to tension, giving full play to the material characteristics of steel and concrete. The development of composite structure provides a new idea for solving some technical problems in bridge engineering. It reduces the weight of the structure, makes the span of the bridge bigger, and at the same time improves the aseismic performance of the building and the economic benefit of the construction. It is an important direction of bridge engineering development. The application of combinatorial structures in China is becoming more and more extensive, and its reasonable mechanical properties and excellent technical and economic indexes make its application in China have a long-term development prospect, and with the deepening of experimental research, It can be predicted that the composite structure will continue to develop and become the main structural form of bridge engineering after the traditional concrete structure and steel structure. In this paper, the mechanical properties of steel-concrete composite beams with long span single T steel truss under train load are studied in this paper. By studying the mechanics of the steel-concrete composite structure, the stress characteristics of the bridge under various working conditions are calculated, which provides the basis for the design of the bridge. The main contents of this thesis and the key problems to be solved are as follows: (1) on the basis of analyzing the existing steel-concrete composite structure, A perfect mechanical analysis model of single T stiffened steel truss composite beam with high speed and long span is established. (2) with the help of Midas finite element software and mechanics principle, the finite element model of single T stiffened steel truss composite bridge with high speed and long span is determined, calculated and compared. The optimal combination structure is analyzed. (3) taking the Jinshan Yellow River super bridge of the new Datong to Xi'an high-speed railway as an example, combining the concrete construction situation, the design and research which kind of composite structure can be more efficient, high quality and economical to meet the high-speed rail code is carried out.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U448.13

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