本文關鍵詞： 鋼箱拱肋 風荷載效應 溫度荷載效應 穩(wěn)定性 塔架　出處：《江蘇科技大學》2014年碩士論文　論文類型：學位論文

【摘要】：隨著拱橋跨徑的增大，國內(nèi)外橋梁專家和研究學者在鋼箱拱肋拱橋結(jié)構(gòu)所受風荷載效應和溫度荷載效應方面做了一系列研究，但大多集中于成橋階段，而對施工過程中鋼箱拱肋的風荷載效應和溫度荷載效應的研究相對較少。本文以在建的鄂爾多斯市伊克昭大橋為工程背景，對施工過程中鋼箱拱肋及塔架結(jié)構(gòu)受風荷載效應和溫度荷載效應影響下結(jié)構(gòu)的變形、應力以及穩(wěn)定性進行了研究，，得出了有益結(jié)論，可為日后同類橋型的施工提供一定的參考。 本文首先系統(tǒng)論述了國內(nèi)外鋼箱拱橋風荷載效應和溫度荷載效應的研究現(xiàn)狀，介紹了橋梁結(jié)構(gòu)第一類、第二類穩(wěn)定問題的基本概念，闡述了第一類穩(wěn)定問題的線彈性有限元理論。重點介紹了橋梁結(jié)構(gòu)有限元軟件Midas/civil對結(jié)構(gòu)屈曲分析的基本原理。接著論述了溫度荷載效應的相關理論,并對分析溫度場的兩種常用方法進行了詳細闡述。 其次，對伊克昭大橋的工程概況做了簡單介紹，提出了三種吊裝方案，通過方案比選，確定采用一次性支架整體翻轉(zhuǎn)整體提升方案。運用橋梁有限元軟件Midas/civil建立拱肋和塔架模型，將施工過程劃分為三個工況，研究拱肋和塔架處于不同工況下計入風荷載效應和溫度荷載效應前后結(jié)構(gòu)的位移、應力及穩(wěn)定性。結(jié)果表明：在拱肋整體翻轉(zhuǎn)階段，計入風荷載效應和溫度效應的影響，拱肋結(jié)構(gòu)具有較大的安全儲備，結(jié)構(gòu)安全穩(wěn)定；焊接風撐時，拱肋控制截面變形受風荷載效應影響較大，受溫度荷載效應影響較��；吊桿張拉施工時應考慮風荷載效應和溫度效應對拱肋豎向變形的不利影響；塔架的穩(wěn)定性受風荷載影響很大，尤其是整體提升階段，塔架穩(wěn)定性較弱，應引起足夠的重視；計入風荷載效應和溫度荷載效應的影響后，塔架纜風索仍具有具有較大的安全儲備，拉索安全。本文的研究成果可為日后同類橋梁的設計與施工提供一定的借鑒和理論指導，同時也為相關規(guī)范以及標準的完善提供一定得參考意見。
[Abstract]:With the increase of span of arch bridge, bridge experts and researchers at home and abroad have done a series of research on the effect of wind load and temperature load on steel box arch rib arch bridge, but most of them are focused on the stage of bridge completion. However, there are few researches on the wind and temperature load effects of steel box arch ribs during the construction process. This paper takes the construction of the Erdos Ikezhao Bridge as the engineering background. The deformation, stress and stability of steel box arch rib and tower structure under the influence of wind load and temperature load are studied, and some useful conclusions are obtained, which can provide some reference for similar bridge construction in the future. In this paper, the research status of wind load effect and temperature load effect of steel box arch bridge at home and abroad is systematically discussed, and the basic concepts of the first kind and the second kind of stability problem of bridge structure are introduced in this paper. In this paper, the linear elastic finite element theory of the first kind of stability problem is expounded. The basic principle of the structural buckling analysis of the bridge structure with the finite element software Midas/civil is emphatically introduced, and then the related theory of the temperature load effect is discussed. Two common methods for analyzing temperature field are described in detail. Secondly, the general situation of the Ikezhao Bridge is briefly introduced, and three hoisting schemes are put forward. The whole lifting scheme of one-off support is adopted. The arch rib and tower model are established by using the bridge finite element software Midas/civil, and the construction process is divided into three working conditions. The displacement, stress and stability of arch rib and tower before and after considering wind load effect and temperature load effect under different working conditions are studied. The results show that the influence of wind load effect and temperature effect is taken into account in the whole arch rib turnover stage. The arch rib structure has a large safety reserve and the structure is safe and stable, and the deformation of the arch rib control section is greatly affected by the wind load effect and is less affected by the temperature load effect when the welding wind braces. The adverse effect of wind load and temperature effect on vertical deformation of arch rib should be taken into account in the construction of suspender tensioning, the stability of tower is greatly affected by wind load, especially in the whole lifting stage, the stability of tower is weak, which should be paid enough attention to. After taking into account the effects of wind load and temperature load, the tower cable wind cable still has a large safety reserve and cable safety. The research results of this paper can provide some reference and theoretical guidance for the design and construction of similar bridges in the future. At the same time for the improvement of relevant norms and standards to provide certain reference.
【學位授予單位】：江蘇科技大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：U445.4;U448.22

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本文編號：1514890