上承式钢管混凝土拱桥结构选型及计算分析

发布时间：2018-01-10 19:18

本文关键词：上承式钢管混凝土拱桥结构选型及计算分析　出处：《湖南大学》2015年硕士论文　论文类型：学位论文

【摘要】：钢管混凝土拱桥具有跨越能力大、施工架设技术成熟、造型美观等优点,近年来在我国发展迅速。本文以张花高速猛洞河特大桥作为工程依托,较为详细的进行了以下几个方面的研究：(1)总结了钢管混凝土拱桥的基本计算理论和设计方法,重点研究了钢管混凝土构件的极限承载力验算方法。(2)提出了钢管混凝土拱桥结构选型理论；总结了上承式、中承式和下承式拱桥的结构特点；从拱肋截面形式、拱轴线、桁架高度、腹杆布置等方面总结了钢管混凝土拱桥的设计经验。(3)分析了上承式拱桥的结构受力特点；针对上承式拱桥的受压立柱过高容易产生失稳的问题,提出采用格构式立柱结构,显著提高了其稳定性；针对拱肋应力尖角过大的问题,提出了在集中力位置采用双竖腹杆加倒V型斜腹杆的腹杆布置形式,有效地削减了拱肋节点应力峰值。(4)对猛洞河大桥桁式钢管混凝土主拱圈、格构式拱上立柱和钢盖梁等结构进行了计算分析。计算结果表明,猛洞河大桥结构受力性能满足要求。(5)根据悬链线无铰拱截面内力影响线理论分析和施工全过程有限元仿真分析,得到拱上结构应遵循的“逐次均衡、对称施工”加载原则和“从拱顶到拱脚”分条对称施工方案。
[Abstract]:Concrete-filled steel tubular arch bridge has the advantages of large span capacity, mature construction technology, beautiful shape and so on. In recent years, it has developed rapidly in China. Detailed research on the following aspects: 1) summarized the basic calculation theory and design method of CFST arch bridge. The checking method of ultimate bearing capacity of concrete-filled steel tubular members is studied emphatically. The selection theory of concrete filled steel tubular arch bridges is put forward. The structural characteristics of the upper, middle and lower arch bridges are summarized. The design experience of concrete-filled steel tube arch bridge is summarized from the aspects of section form of arch rib, arch axis, truss height, web bar arrangement, etc.) the structural stress characteristics of upper bearing arch bridge are analyzed. In view of the problem that the columns of overbearing arch bridges are easy to lose stability when the columns are too high, a lattice structure is proposed to improve the stability of arch bridges. Aiming at the problem of excessive stress sharp angle of arch rib, this paper puts forward the web bar arrangement form of double vertical web bar plus inverted V-shaped inclined web bar in the position of concentrated force. The peak stress of arch rib joint is reduced effectively.) the calculation and analysis of truss concrete filled steel tube main arch ring, lattice arch column and steel capping beam of the bridge are carried out. According to the theoretical analysis of the internal force influence line of catenary non-hinged arch section and the finite element simulation analysis of the whole construction process, the "successive equilibrium" should be followed for the arch structure. Symmetrical construction "loading principle" and "from vault to arch foot" split symmetrical construction scheme.
【学位授予单位】：湖南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U448.22

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