正交异性钢箱梁桥梯形加劲板稳定性能研究

发布时间：2018-05-21 18:59

本文选题：正交异性 + 钢箱梁　；参考：《南华大学》2015年硕士论文

【摘要】：钢结构具有自重轻、延性好、强度高、可回收等优点,在桥梁中运用越来越广泛,钢结构桥梁作为基础建设的重要结构,对社会生产活动以及国民的生活与生命安全有很大的影响,而顶板的整体的稳定又是桥梁稳定的重要内容,梯形加劲板的破坏将削弱钢箱梁整体承载力,使结构的承载力没有充分发挥,所以研究梯形加劲肋各种形式布置下的承载力和稳定性对指导设计很有必要。本文以实际工程成都新光路口钢箱梁桥为模型,利用非线性有限元软件MIDAS FEA模拟了实际工程中建桥过程及成桥后钢箱梁桥的受力的性能,对梯形加劲板的稳定问题和稳定承载能力的问题进行了研究,本文重点研究了钢箱梁桥加劲肋板的稳定承载能力及破坏形式与梯形肋尺寸、厚度、布置间距等问题。首先介绍了钢箱梁的发展历史和正交异性钢桥面板在桥梁工程中的应用现状及设计时遇到的技术问题,大跨度钢箱梁桥的稳定问题更加突出。然后,介绍了经典线弹性理论和四边简支板的屈曲临界应力的理论解以及各国规范对板局部稳定的规定;再介绍了国内外的规范对加劲板的计算方法,并比较分析找到各自的适用范围。目前钢箱梁设计中常在顶板布置数道纵向梯形加劲肋,梯形加劲肋很大程度的增加了钢箱梁顶板的刚度,增强截面惯性矩,从而在整体上增强了顶板的稳定性,提高结构的整体平均破坏应力,采用有限元软件MIDAS FEA模拟20组不同厚度和高度的梯形闭口加劲肋,并综合比较各国规范,选择合适的规范中公式进行计算对比分析,以得到各种布置形式下的最小刚度和临界屈曲应力之间的关系,确定最合适的布置方式。
[Abstract]:Steel structure has the advantages of light weight, good ductility, high strength and recoverability. It is used more and more widely in bridges. It has a great influence on the social production activities and the life and safety of the people, and the overall stability of the roof is an important part of the bridge stability. The destruction of the trapezoidal stiffening plate will weaken the overall bearing capacity of the steel box girder. Therefore, it is necessary to study the bearing capacity and stability of trapezoidal stiffening ribs under various configurations. Taking the steel box girder bridge at the Xinguang intersection of Chengdu as the model, the nonlinear finite element software MIDAS FEA is used to simulate the process of the bridge construction and the mechanical performance of the steel box girder bridge after the completion of the bridge. The stability of trapezoidal stiffened plate and the problem of stable bearing capacity are studied in this paper. In this paper, the stable bearing capacity and failure form of stiffened ribbed plate of steel box girder bridge and the problems of trapezoid rib size, thickness, arrangement spacing and so on are studied. Firstly, the development history of steel box girder and the application status of orthotropic steel bridge face slab in bridge engineering and the technical problems encountered in the design are introduced. The stability problem of long span steel box girder bridge is more prominent. Then, the classical linear elastic theory and the theoretical solution of the buckling critical stress of simply supported plates with four edges are introduced, and the local stability of the plates in various codes are also introduced, and the calculation methods for stiffened plates by the codes at home and abroad are also introduced. And comparative analysis to find their respective scope of application. At present, in the design of steel box girder, several longitudinal trapezoidal stiffeners are often arranged on the roof. The trapezoidal stiffening rib greatly increases the stiffness of the roof of the steel box girder, enhances the moment of inertia of the section, and thus enhances the stability of the roof as a whole. To improve the overall average failure stress of the structure, the finite element software MIDAS FEA is used to simulate 20 groups of trapezoidal stiffening ribs with different thickness and height. The relationship between the minimum stiffness and the critical buckling stress is obtained, and the most suitable arrangement is determined.
【学位授予单位】：南华大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U441;U448.36

【共引文献】