大跨混合体系斜拉桥静力性能分析

发布时间：2018-05-01 01:29

本文选题：混合体系斜拉桥 + 结构体系参数　；参考：《湖南大学》2016年硕士论文

【摘要】：混合体系斜拉桥边跨采用混凝土主梁,中跨采用钢主梁或钢-混叠合梁,综合了两种主梁材料的优点,是一种非常具有潜力的新型桥梁形式。相比于普通斜拉桥,混合体系斜拉桥在结构受力、主跨跨越能力、施工安全和质量保证以及对地形的适应性等方面具有不可比拟的优越和灵活性,在特大跨径桥梁设计中具有独特的竞争力。本文以一座主跨360m混合式叠合梁斜拉桥为工程依托,主要针对混合体系斜拉桥的合理结构体系,叠合梁剪力滞效应计算以及混凝土收缩徐变对全桥受力影响进行分析研究,为同类桥梁的优化设计提供一定的参考。本文的主要工作及成果如下:(1)查阅国内外相关的文献资料,对混合体系斜拉桥的发展历程、受力特点以及优缺点进行全面的阐述。(2)对混合体系斜拉桥理想成桥状态、合理边中跨比、合理塔高比进行理论上的推导,并对乌江桥合理结构体系在理论上予以分析验证。基于有限元模型,分别研究了边主梁刚度、主塔刚度、主塔高度、边中跨比等结构体系参数,计算分析各项参数对混合体系斜拉桥结构受力影响。(3)基于现阶段国内外研究现状,针对斜拉桥叠合梁剪力滞效应,采用基于全桥杆系、局部杆系和局部实体三个分析模型相结合的计算方法,获得了典型代表区域“上”字型钢-混叠合梁的正应力分布和有效宽度系数。(4)计算混凝土收缩徐变对混合体系斜拉桥整体结构受力和叠合梁应力重分布的影响,对比分析三年和十年收缩徐变的进展情况,并考虑了混凝土不同加载龄期对收缩徐变的影响,验证了乌江桥叠合梁预制桥面板加载龄期的合理性。
[Abstract]:The concrete main beam is used in the side span of the cable-stayed bridge with hybrid system, and the steel main beam or the steel-composite composite beam is used in the middle span, which combines the advantages of the two kinds of main girder materials and is a new type of bridge with great potential. Compared with ordinary cable-stayed bridges, hybrid cable-stayed bridges have incomparable advantages and flexibility in structural stress, span capacity, construction safety, quality assurance and adaptability to terrain. It has unique competitiveness in the design of long span bridges. Based on a 360m hybrid cable-stayed bridge with main span, this paper mainly focuses on the reasonable structural system of the cable-stayed bridge with hybrid system, the calculation of the shear lag effect of the composite beam and the influence of concrete shrinkage and creep on the stress of the whole bridge. It provides a certain reference for the optimization design of similar bridges. The main work and results of this paper are as follows: 1) referring to the relevant literature data at home and abroad, the development course, mechanical characteristics, advantages and disadvantages of hybrid cable-stayed bridges are expounded comprehensively. 2) the ideal bridge status of hybrid cable-stayed bridges is discussed. The reasonable ratio of side to middle span and the ratio of tower to height are deduced theoretically, and the reasonable structure system of Wujiang Bridge is analyzed and verified theoretically. Based on the finite element model, the structural parameters, such as the stiffness of the main beam, the height of the main tower and the ratio of the side to middle span, are studied, and the effects of the parameters on the stress of the cable-stayed bridge with hybrid system are calculated and analyzed. Aiming at the shear lag effect of superimposed beam of cable-stayed bridge, the calculation method based on the three analytical models of the whole bridge bar system, the local member system and the local solid is adopted. In this paper, the normal stress distribution and effective width coefficient of typical "upper" section steel-composite beams are obtained. The effect of shrinkage and creep of concrete on the stress and stress redistribution of composite cable-stayed bridges is calculated. By comparing and analyzing the progress of shrinkage and creep in three years and ten years, and considering the influence of different loading ages on shrinkage and creep of concrete, the rationality of loading age of precast deck slab of composite beam of Wujiang Bridge is verified.
【学位授予单位】：湖南大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：U441;U448.27

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