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  本文選題：正交異性鋼橋面板　切入點：構(gòu)造細節(jié)　出處：《西南交通大學》2014年碩士論文

【摘要】：正交異性鋼橋面板具有質(zhì)輕、極限承載能力大,易于裝配化、施工周期短等顯著優(yōu)點而被廣泛運用于現(xiàn)代大跨度橋梁建設(shè)中,但同時正交異性鋼橋面板制造安裝誤差、初始缺陷及應(yīng)力集中顯著等因素導致在荷載反復作用下疲勞易損傷部位極易開裂。正交異性鋼橋面板的疲勞問題直接影響鋼橋的使用壽命,是橋梁建設(shè)中的難點和熱點問題,所以對正交異性鋼橋面板的抗疲勞性能進行研究顯得十分必要。論文主要從正交異性鋼橋面板的構(gòu)造細節(jié)和設(shè)計參數(shù)兩方面著手進行研究分析,其主要工作如下： (1)回顧了正交異性鋼橋面板的發(fā)展歷程,對正交異性鋼橋面板的國內(nèi)外研究進展現(xiàn)狀和疲勞病害問題進行了介紹和總結(jié)。 (2)對鋼橋疲勞基本理論進行了闡述。主要介紹了疲勞的基本概念、三種疲勞積傷理論、疲勞壽命評估的方法和鋼橋抗疲勞設(shè)計方法。 (3)以港珠澳大橋為研究背景,對正交異性鋼橋面板的縱肋與面板的縱向連接處和橫隔板U肋交叉處的構(gòu)造細節(jié)開展抗疲勞性能試驗研究,并采用ANSYS有限元軟件對上述構(gòu)造細節(jié)進行仿真分析,研究了不同頂板與縱肋之間的連接焊縫的熔透率對此區(qū)域焊縫應(yīng)力的影響以及橫隔板U肋交叉處的受力特性。 (4)采用響應(yīng)面法對正交異性鋼橋面板的設(shè)計參數(shù)在合理取值區(qū)間內(nèi)設(shè)計實驗樣本,建立了參數(shù)化的正交異性鋼橋面板有限元分析模型,通過仿真分析計算出待研究易損細節(jié)應(yīng)力的響應(yīng)值。在此基礎(chǔ)上運用最小二乘法原理求出各類疲勞細節(jié)應(yīng)力及模型質(zhì)量的響應(yīng)面模型。最后對響應(yīng)面模型進行優(yōu)化,從而求出對應(yīng)各類疲勞細節(jié)性能較優(yōu)的合理參數(shù)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.
【學位授予單位】：西南交通大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：U441.4;U443.32

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