榕江特大桥正交异性钢桥面结构受力性能分析与试验研究

发布时间：2018-02-11 08:36

本文关键词： 正交异性整体钢桥面多尺度模型有限元静载试验钢桁梁柔性拱　出处：《中南大学》2014年硕士论文　论文类型：学位论文

【摘要】：摘要：厦深客运专线榕江特大桥系主跨为(110+220+220+110)m的钢桁梁柔性拱桥,跨度在同类型桥梁中居世界首位,其桥面系结构为一类新型的正交异性整体钢桥面结构,其中,道砟与钢桥面板之间采用轻质垫层体系替代传统的带剪力钉的混凝土垫层,该类轻质垫层在国内铁路桥梁上尚属首次采用,同时在道砟槽范围内采用合理密布U肋的形式,弱化了传统正交异性整体钢桥面中纵梁的作用。本文结合工程建设需要和原铁道部科技研究开发计划《高速铁路桥梁技术深化研究一一大跨度连续钢桁梁柔性拱组合桥关键技术研究》(合同编号：2010G004-A),对该类新型正交异性整体钢桥面结构进行结构性能的理论和现场试验研究,完成的工作和创新点有： 1.建立了全桥杆系模型,分析了由桥面盖板和纵肋组成的桥面系对主桁的刚度及受力的影响,进一步探讨了桥面系相对于主桁位置的改变对主桁刚度及受力的影响。 2.针对传统的研究正交异性整体钢桥面结构的节段模型法中边界条件难以准确模拟的问题,本文将空间杆系法(SF法)和板壳单元法(SPB法)结合利用有限元软件建立多尺度模型,避免了传统方法边界条件的选取问题,并分析正交异性整体钢桥面结构中各构件的受力状况,取位移边界条件,建立节段模型并计算,与多尺度模型计算结果进行对比。 3.研究了钢桥面板(U肋翼板)厚度、U肋厚度的不同参数对正交异性整体钢桥面结构受力特性的影响,给出了桥面板厚度和U肋厚度的合理取值范围。 4.完成了榕江特大桥桥面板现场静载试验的方案设计、试验测试和数据分析整理工作,并将测试结果与多尺度模型理论计算结果进行对比,并进行结构安全性评判。 5.试验和理论分析结果验证了设计结构的安全性。
[Abstract]:Absrtact: the main span of Rongjiang large bridge system of Xia-Shenzhen passenger dedicated line is a steel truss beam flexible arch bridge with a span of 110 220 220 110m, the span of which occupies the first place in the world in the same type of bridge, and its deck system structure is a new type of orthotropic steel deck structure, among which, The lightweight cushion system is used to replace the traditional concrete cushion with shear nail between the ballast and the steel bridge slab. This kind of light cushion is first adopted on the domestic railway bridge, and the reasonable form of U rib is used in the ballast slot. The function of longitudinal beam in traditional orthotropic steel deck is weakened. In this paper, according to the need of engineering construction and the scientific and technological research and development plan of the original ministry of railway < technology deepening research of high speed railway bridge-long span continuous steel truss beam flexible arch. Research on key techniques of Composite Bridges. (contract No.: 201G004-AHU, theoretical and field experimental study on the structural properties of this new type of orthotropic steel deck structure, The following work and innovations have been accomplished:. 1. The model of full bridge bar system is established, and the influence of deck system composed of deck slab and longitudinal rib on the stiffness and force of main truss is analyzed, and the influence of the change of bridge deck system relative to the position of main truss on the stiffness and force of main truss is discussed. 2. In order to solve the problem that the boundary conditions are difficult to be accurately simulated in the traditional segmental model method for studying orthotropic steel deck structures, in this paper, a multi-scale model is established by using the finite element method (FEM) and the finite element method (SPB method) and the space bar system method (SF method) and the plate shell element method (SPB method). The selection of boundary conditions by traditional method is avoided, and the stress condition of each member in orthotropic steel deck structure is analyzed. The displacement boundary condition is taken, and the segmental model is established and calculated. The results are compared with the results of multi-scale model. 3. The influence of different parameters of steel bridge face slab thickness and U-rib thickness on the stress characteristics of orthotropic steel deck structure is studied, and the reasonable value range of deck thickness and U-rib thickness is given. 4. The scheme design, test test and data analysis of the bridge deck of Rongjiang super bridge are completed, and the results are compared with the theoretical results of multi-scale model, and the structural safety is evaluated. 5. The experimental and theoretical results verify the safety of the design structure.
【学位授予单位】：中南大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U441;U443.31

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