正交异性钢桥面板疲劳裂缝分析

发布时间：2018-06-05 05:42

本文选题：正交异性钢桥面板 + 疲劳裂缝　；参考：《北京交通大学》2014年硕士论文

【摘要】：摘要：正交异性钢桥面板是由纵肋和横隔板连同桥面板组成的共同承受桥面荷载的整体结构。因为其兼具自身轻、省料、承载能力强和施工周期短等诸多优点,常被用于大跨度桥梁的建设。随着正交异性钢桥面板的广泛应用,其疲劳裂缝问题也越来越突出,分析原因并找到合理的、有效的、经济的预防措施及加固方法的研究是非常必要的。本文在查阅大量国内外文献资料的基础上,以有限元软件ABAQUS为手段,对正交异性钢桥面板的疲劳裂缝进行了研究,主要完成了以下几个方面的内容： (1)综述了正交异性钢桥面板在桥梁上应用的历史与现状,总结了国内外学者对正交异性钢桥面板疲劳开裂问题的研究方法及存在问题。提出本文的研究意义。 (2)钢桥疲劳开裂问题的理论分析,包括疲劳开裂的主要影响因素、疲劳验算、疲劳寿命评估的方法和钢桥疲劳设计的常用方法；总结国内、外规范(重点是英国规范BS5400)和对钢桥疲劳的相关规定。 (3)采用abaqus611软件对正交异性钢桥面板建立有限元模型,进行疲劳裂缝的仿真分析。通过仿真分析找出正交异性钢桥面板的疲劳高发区,探讨疲劳裂缝产生的力学机理。并进一步分析了造成各大桥梁过早出现疲劳裂缝的主要原因。 (4)针对常见的几种疲劳裂缝提出了相应的治理裂缝、加固桥面板的方案。针对3种不同方案,分别建立了全桥疲劳计算的有限元模型。参考英国规范BS5400,对比分析了各方案疲劳关注点的应力历程、疲劳荷载谱和疲劳剩余寿命,给出了3种裂缝治理方案的优缺点。然后结合工程实际,对正交异性钢桥面板疲劳裂缝的综合治理给出了合理化的建议。
[Abstract]:Absrtact: orthotropic steel bridge slab is an integral structure which is composed of longitudinal rib, transverse partition plate and deck slab. It is often used in the construction of long span bridges because of its advantages of light weight, low material, strong bearing capacity and short construction period. With the wide application of orthotropic steel bridge panels, the fatigue crack problem is more and more prominent. It is necessary to analyze the causes and find reasonable, effective and economical preventive measures and reinforcement methods. On the basis of consulting a great deal of literature at home and abroad, the fatigue crack of orthotropic steel bridge face slab is studied by the finite element software ABAQUS. The main contents are as follows: This paper summarizes the history and present situation of orthotropic steel bridge slab application on bridge, and summarizes the research methods and existing problems of orthotropic steel bridge face slab fatigue cracking at home and abroad. The significance of this paper is put forward. 2) theoretical analysis of fatigue cracking of steel bridges, including the main influencing factors of fatigue cracking, fatigue checking calculation, methods of fatigue life evaluation and common methods of fatigue design of steel bridges. External specifications (with emphasis on British BS5400) and related regulations on fatigue of steel bridges. The finite element model of orthotropic steel bridge face slab is established by abaqus611 software, and the fatigue crack is simulated and analyzed. The high fatigue area of orthotropic steel bridge panel is found by simulation analysis, and the mechanical mechanism of fatigue crack is discussed. Furthermore, the main causes of premature fatigue cracks in the bridges are analyzed. 4) aiming at some common fatigue cracks, the paper puts forward the scheme of controlling the cracks and strengthening the deck slab. According to three different schemes, the finite element model of full bridge fatigue calculation is established. Referring to British Code BS5400, the stress history, fatigue load spectrum and fatigue residual life of each scheme are compared and analyzed, and the advantages and disadvantages of three kinds of crack treatment schemes are given. Combined with the engineering practice, some reasonable suggestions are given for the comprehensive treatment of fatigue cracks of orthotropic steel bridge panels.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U448.36;U445.71

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