基于响应面法的正交异性钢桥面板疲劳设计参数研究

发布时间：2018-04-02 21:53

本文选题：正交异性钢桥面板　切入点：构造细节　出处：《西南交通大学》2014年硕士论文

【摘要】：正交异性钢桥面板具有质轻、极限承载能力大,易于装配化、施工周期短等显著优点而被广泛运用于现代大跨度桥梁建设中,但同时正交异性钢桥面板制造安装误差、初始缺陷及应力集中显著等因素导致在荷载反复作用下疲劳易损伤部位极易开裂。正交异性钢桥面板的疲劳问题直接影响钢桥的使用寿命,是桥梁建设中的难点和热点问题,所以对正交异性钢桥面板的抗疲劳性能进行研究显得十分必要。论文主要从正交异性钢桥面板的构造细节和设计参数两方面着手进行研究分析,其主要工作如下： (1)回顾了正交异性钢桥面板的发展历程,对正交异性钢桥面板的国内外研究进展现状和疲劳病害问题进行了介绍和总结。 (2)对钢桥疲劳基本理论进行了阐述。主要介绍了疲劳的基本概念、三种疲劳积伤理论、疲劳寿命评估的方法和钢桥抗疲劳设计方法。 (3)以港珠澳大桥为研究背景,对正交异性钢桥面板的纵肋与面板的纵向连接处和横隔板U肋交叉处的构造细节开展抗疲劳性能试验研究,并采用ANSYS有限元软件对上述构造细节进行仿真分析,研究了不同顶板与纵肋之间的连接焊缝的熔透率对此区域焊缝应力的影响以及横隔板U肋交叉处的受力特性。 (4)采用响应面法对正交异性钢桥面板的设计参数在合理取值区间内设计实验样本,建立了参数化的正交异性钢桥面板有限元分析模型,通过仿真分析计算出待研究易损细节应力的响应值。在此基础上运用最小二乘法原理求出各类疲劳细节应力及模型质量的响应面模型。最后对响应面模型进行优化,从而求出对应各类疲劳细节性能较优的合理参数匹配。
[Abstract]:Orthotropic steel bridge panels are widely used in modern long span bridge construction due to their advantages of light weight, large ultimate bearing capacity, easy assembly and short construction period, but at the same time orthotropic steel bridge panel manufacturing and installation error.The initial defects and the obvious stress concentration lead to the easy cracking of the damaged parts of fatigue under repeated loads.The fatigue problem of orthotropic steel bridge panel directly affects the service life of steel bridge and is a difficult and hot problem in bridge construction. So it is very necessary to study the fatigue resistance of orthotropic steel bridge panel.In this paper, the construction details and design parameters of orthotropic steel bridge face slab are studied and analyzed. The main work is as follows:In this paper, the development of orthotropic steel bridge panels is reviewed, and the research progress and fatigue diseases of orthotropic steel bridge panels are introduced and summarized.This paper mainly introduces the basic concept of fatigue, three kinds of fatigue damage theory, the method of fatigue life evaluation and the method of anti-fatigue design of steel bridge.Taking the HongKong-Zhuhai-Macao Bridge as the research background, the fatigue performance of the longitudinal rib and the longitudinal joint of the orthotropic steel bridge slab and the cross section of the U-rib of the transverse partition plate are studied experimentally.The ANSYS finite element software is used to simulate and analyze the structural details above. The influence of penetration ratio of the connecting welds between different roof and longitudinal ribs on the stress of the weld in this area and the stress characteristics at the U-rib cross of the transverse diaphragm are studied.4) the finite element analysis model of orthotropic steel bridge panel is established by using response surface method to design experimental samples of orthotropic steel bridge panel in a reasonable value range.Through the simulation analysis, the response value of the vulnerable detail stress to be studied is calculated.On this basis, the response surface models of various fatigue detail stresses and model quality are obtained by using the least square method.Finally, the response surface model is optimized, and the reasonable parameter matching corresponding to various fatigue details is obtained.
【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】：U441.4;U443.32

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