發(fā)布時間：2019-03-03 15:13

【摘要】：鋼箱梁橋因其跨越能力強、工廠加工制造速度快、施工對橋下交通影響小等優(yōu)點常用于城市高架橋、城市立交匝道橋中，然而在鋼箱梁的設(shè)計、建設(shè)和使用過程中仍存在一些亟需解決的關(guān)鍵問題。本文以臺州互通式立交匝道上的曲線鋼箱梁橋設(shè)計為依托，探討、分析大跨曲線鋼箱梁橋設(shè)計中的關(guān)鍵技術(shù)問題，為大跨曲線鋼箱梁橋的設(shè)計與建造提供技術(shù)支撐。 本文具體工作內(nèi)容如下： 1.曲線鋼箱梁橋結(jié)構(gòu)自重較輕，后期運營過程中存在偏載，傾覆穩(wěn)定性已經(jīng)成為控制小半徑曲線鋼箱梁設(shè)計的關(guān)鍵。本文介紹了鋼箱梁橋頻繁出現(xiàn)的傾覆災(zāi)害，對橋梁傾覆問題進行分析，闡述了抗傾覆系數(shù)的計算原理。采用Madis/Civil建模進行參數(shù)化分析，研究影響鋼箱梁抗傾覆穩(wěn)定性的因素并提出提高鋼箱梁抗傾覆的若干措施。通過對臺州立交典型曲線鋼箱梁橋的抗傾覆穩(wěn)定性的計算分析，提出了設(shè)計改進措施。 2.鋼橋面板的疲勞問題是鋼箱梁橋設(shè)計中應(yīng)重點關(guān)注的技術(shù)問題。鋼箱梁橋U肋通過橫隔板處挖孔位置疲勞細節(jié)較多，易于疲勞開裂。本文建立三維有限元模型，對鋼箱梁正交異性橋面板挖孔型式進行了參數(shù)化分析，對比了四種常用的U肋挖孔型式的疲勞性能，并對橫隔板高度、板件厚度對挖孔處疲勞性能的影響做了分析。 3.鋼箱梁橋面鋪裝易破損，，影響鋼箱梁橋的耐久性和后期維護成本。本文分析了正交異性鋼橋面板橋面鋪裝與公路面層的受力區(qū)別，以及病害形成機理的差異性。針對鋼橋面鋪裝病害特征，提出了有效解決常見病害的組合鋪裝層形式。采用有限元計算，對比分析了三種鋪裝層對鋼橋面板疲勞應(yīng)力水平的影響，結(jié)果表明組合鋪裝層可顯著降低鋼橋面板疲勞應(yīng)力水平，延長鋼橋面板的使用使用壽命，解決鋼橋面鋪裝易損性問題。 4.鋼結(jié)構(gòu)橋梁的防腐問題是控制鋼箱梁橋推廣使用的技術(shù)瓶頸之一，耐候鋼的合理應(yīng)用可有效解決鋼橋的防腐維護問題。本文探討了耐候橋梁鋼的耐腐蝕機理，對我國生產(chǎn)的耐候橋梁鋼的耐候性進行了對比分析。結(jié)合工程設(shè)計實例，對耐候鋼的涂裝方式、設(shè)計與施工工藝要點進行了分析，總結(jié)、提出了工程實施建議。
[Abstract]:Steel box girder bridge is often used in urban viaduct and on-ramp bridge because of its strong span ability, high manufacturing speed of factory and small influence of construction on traffic under the bridge. However, in the design of steel box girder, the steel box girder is used in the design of steel box girder. There are still some key problems that need to be solved in the process of construction and use. Based on the design of curved steel box girder bridge on the ramp of Taizhou interchange, this paper discusses the key technical problems in the design of long span curved steel box girder bridge, and provides technical support for the design and construction of long span curved steel box girder bridge. The specific contents of this paper are as follows: 1. The structure of curved steel box girder bridge is light in weight and there is bias load in the later operation process. The overturning stability has become the key to control the design of small radius curved steel box girder. In this paper, the frequent overturning disasters of steel box girder bridges are introduced, the overturning problems of bridges are analyzed, and the calculation principle of anti-capsizing coefficient is expounded. The parametric analysis of steel box girder is carried out by using Madis/Civil modeling. The factors affecting the anti-overturning stability of steel box girder are studied and some measures to improve the overturning resistance of steel box girder are put forward. Based on the calculation and analysis of the anti-overturning stability of the typical curved steel box girder bridge of Taizhou interchange, the design improvement measures are put forward. 2. Fatigue problem of steel bridge deck is a technical problem which should be paid attention to in the design of steel box girder bridge. The fatigue details of the U-rib position of the steel box girder bridge through the transverse partition plate are more detailed and easy to fatigue cracking. In this paper, a three-dimensional finite element model is established, and the parametric analysis of the hole-digging pattern of orthotropic bridge deck of steel box girder is carried out. The fatigue properties of four commonly used U-rib hole-digging types are compared, and the height of the transverse diaphragm is analyzed. The effect of the plate thickness on the fatigue behavior of the excavated hole is analyzed. 3. Steel box girder deck pavement is easily damaged, which affects durability and maintenance cost of steel box girder bridge. In this paper, the difference between orthotropic steel deck pavement and highway deck is analyzed, as well as the difference of disease formation mechanism. In view of the disease characteristics of steel bridge deck pavement, this paper puts forward the composite pavement form which can effectively solve the common diseases. The influence of three kinds of pavement on the fatigue stress level of steel bridge deck is analyzed by finite element method. The results show that the composite pavement can significantly reduce the fatigue stress level of steel bridge deck and prolong the service life of steel bridge deck. To solve the vulnerability problem of steel bridge deck pavement. 4. The anticorrosion problem of steel structure bridge is one of the technical bottlenecks to control the popularization and application of steel box girder bridge. The reasonable application of weathering steel can effectively solve the problem of corrosion protection and maintenance of steel bridge. In this paper, the corrosion resistance mechanism of weatherproof bridge steel is discussed, and the weatherability of weather-resistant bridge steel produced in China is compared and analyzed. Combined with engineering design examples, the main points of coating mode, design and construction technology of weatherproof steel are analyzed, summarized, and some suggestions for engineering implementation are put forward.
【學位授予單位】：長安大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：U448.213

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本文編號：2433815