铺装层对正交异性钢桥面板疲劳性能影响的研究

发布时间：2018-04-10 10:13

本文选题：正交异性钢桥面板　切入点：桥面铺装　引自：《西南交通大学》2014年硕士论文

【摘要】：正交异性板结构板件众多、纵横肋交错且立体焊缝数量较多,因而受力复杂、应力集中程度显著,导致其疲劳问题突出。另一方面,正交异性钢桥面板结构的抗疲劳设计一般从正交异性钢桥面板自身构造参数的考虑居多,同时结合桥面铺装进行一体化设计的研究相对较少。论文考虑桥面铺装的作用,首先通过有限元仿真分析重点研究了铺装的构造及性能参数变化对正交异性钢桥面板疲劳性能的影响,其次验证了当前国内外常用的铺装作用简化方法的安全性,最后对疲劳分析时考虑铺装作用的轮载加载面积的扩散角进行了讨论。具体工作如下： (1)回顾了正交异性钢桥面板的发展史,总结了正交异性钢桥面板疲劳裂纹种类及位置,整理了关于铺装与正交异性钢桥面板一体化研究的文献； (2)阐述了钢桥疲劳损伤机理与结构疲劳破坏的类型,详述了变幅疲劳强度与等幅疲劳强度的转换过程,介绍了应力历程的处理方法； (3)归纳了钢桥面铺装的特点,综述了铺装的材料组成与结构形式及其主要病害,确定了铺装主要参数的变化范围；阐述了当前国内外常用的铺装简化方法,为有限元分析提供理论基础； (4)建立了带铺装的正交异性钢桥面板的参数化有限元仿真分析模型,从铺装与钢桥面顶板的层间结合状态,铺装的厚度、弹性模量与结构形式四个方面研究了铺装对选取的易损细节疲劳性能的影响； (5)对考虑铺装扩散效应即扩散角的简化方法进行了有限元分析,提出了针对结构抗疲劳计算的扩散角范围。
[Abstract]:The orthotropic plate structure has a large number of plates with interlaced longitudinal and transverse ribs and a large number of three-dimensional welds. As a result, the stress is complex and the stress concentration is significant, which leads to the prominent fatigue problems of orthotropic plates.On the other hand, the fatigue resistance design of orthotropic steel bridge panel structure is generally considered from the orthotropic steel bridge panel structure parameters, while the research of integrated design combined with deck pavement is relatively rare.Considering the function of deck pavement, the influence of pavement structure and performance parameters on fatigue performance of orthotropic steel bridge is studied by finite element simulation.Secondly, the security of the simplified method of pavement action is verified. Finally, the diffusion angle of the loading area considering the pavement action is discussed in fatigue analysis.The specific work is as follows:1) the development history of orthotropic steel bridge panel is reviewed, the types and location of fatigue cracks in orthotropic steel bridge panel are summarized, and the literatures on the integration of pavement and orthotropic steel bridge face are summarized.(2) the fatigue damage mechanism of steel bridge and the type of fatigue failure of steel bridge are expounded, and the conversion process between the variable amplitude fatigue strength and the equal amplitude fatigue strength is described in detail, and the treatment method of stress history is introduced.This paper sums up the characteristics of steel bridge deck pavement, summarizes the material composition and structure form of pavement and its main diseases, determines the variation range of main parameters of pavement, and expounds the simplification methods of pavement commonly used at home and abroad.To provide the theoretical basis for finite element analysis;(4) the parametric finite element simulation model of orthotropic steel bridge panel with pavement is established, which is based on the state of interlaminar bonding between pavement and steel deck roof, and the thickness of pavement.The influence of pavement on fatigue properties of selected vulnerability details is studied in four aspects of elastic modulus and structure form.5) the simplified method of considering diffusion effect of pavement is analyzed by finite element method, and the range of diffusion angle for fatigue resistance of structure is proposed.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U443.33;U443.32

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