本文關(guān)鍵詞： 正交異性整體鋼橋面 多尺度模型 有限元 靜載試驗(yàn) 鋼桁梁柔性拱　出處：《中南大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：摘要：廈深客運(yùn)專線榕江特大橋系主跨為(110+220+220+110)m的鋼桁梁柔性拱橋,跨度在同類型橋梁中居世界首位,其橋面系結(jié)構(gòu)為一類新型的正交異性整體鋼橋面結(jié)構(gòu),其中,道砟與鋼橋面板之間采用輕質(zhì)墊層體系替代傳統(tǒng)的帶剪力釘?shù)幕炷翂|層,該類輕質(zhì)墊層在國(guó)內(nèi)鐵路橋梁上尚屬首次采用,同時(shí)在道砟槽范圍內(nèi)采用合理密布U肋的形式,弱化了傳統(tǒng)正交異性整體鋼橋面中縱梁的作用。本文結(jié)合工程建設(shè)需要和原鐵道部科技研究開發(fā)計(jì)劃《高速鐵路橋梁技術(shù)深化研究一一大跨度連續(xù)鋼桁梁柔性拱組合橋關(guān)鍵技術(shù)研究》(合同編號(hào)：2010G004-A),對(duì)該類新型正交異性整體鋼橋面結(jié)構(gòu)進(jìn)行結(jié)構(gòu)性能的理論和現(xiàn)場(chǎng)試驗(yàn)研究,完成的工作和創(chuàng)新點(diǎn)有： 1.建立了全橋桿系模型,分析了由橋面蓋板和縱肋組成的橋面系對(duì)主桁的剛度及受力的影響,進(jìn)一步探討了橋面系相對(duì)于主桁位置的改變對(duì)主桁剛度及受力的影響。 2.針對(duì)傳統(tǒng)的研究正交異性整體鋼橋面結(jié)構(gòu)的節(jié)段模型法中邊界條件難以準(zhǔn)確模擬的問(wèn)題,本文將空間桿系法(SF法)和板殼單元法(SPB法)結(jié)合利用有限元軟件建立多尺度模型,避免了傳統(tǒng)方法邊界條件的選取問(wèn)題,并分析正交異性整體鋼橋面結(jié)構(gòu)中各構(gòu)件的受力狀況,取位移邊界條件,建立節(jié)段模型并計(jì)算,與多尺度模型計(jì)算結(jié)果進(jìn)行對(duì)比。 3.研究了鋼橋面板(U肋翼板)厚度、U肋厚度的不同參數(shù)對(duì)正交異性整體鋼橋面結(jié)構(gòu)受力特性的影響,給出了橋面板厚度和U肋厚度的合理取值范圍。 4.完成了榕江特大橋橋面板現(xiàn)場(chǎng)靜載試驗(yàn)的方案設(shè)計(jì)、試驗(yàn)測(cè)試和數(shù)據(jù)分析整理工作,并將測(cè)試結(jié)果與多尺度模型理論計(jì)算結(jié)果進(jìn)行對(duì)比,并進(jìn)行結(jié)構(gòu)安全性評(píng)判。 5.試驗(yàn)和理論分析結(jié)果驗(yàn)證了設(shè)計(jì)結(jié)構(gòu)的安全性。
[Abstract]:Absrtact: the main span of Rongjiang large bridge system of Xia-Shenzhen passenger dedicated line is a steel truss beam flexible arch bridge with a span of 110 220 220 110m, the span of which occupies the first place in the world in the same type of bridge, and its deck system structure is a new type of orthotropic steel deck structure, among which, The lightweight cushion system is used to replace the traditional concrete cushion with shear nail between the ballast and the steel bridge slab. This kind of light cushion is first adopted on the domestic railway bridge, and the reasonable form of U rib is used in the ballast slot. The function of longitudinal beam in traditional orthotropic steel deck is weakened. In this paper, according to the need of engineering construction and the scientific and technological research and development plan of the original ministry of railway < technology deepening research of high speed railway bridge-long span continuous steel truss beam flexible arch. Research on key techniques of Composite Bridges. (contract No.: 201G004-AHU, theoretical and field experimental study on the structural properties of this new type of orthotropic steel deck structure, The following work and innovations have been accomplished:. 1. The model of full bridge bar system is established, and the influence of deck system composed of deck slab and longitudinal rib on the stiffness and force of main truss is analyzed, and the influence of the change of bridge deck system relative to the position of main truss on the stiffness and force of main truss is discussed. 2. In order to solve the problem that the boundary conditions are difficult to be accurately simulated in the traditional segmental model method for studying orthotropic steel deck structures, in this paper, a multi-scale model is established by using the finite element method (FEM) and the finite element method (SPB method) and the space bar system method (SF method) and the plate shell element method (SPB method). The selection of boundary conditions by traditional method is avoided, and the stress condition of each member in orthotropic steel deck structure is analyzed. The displacement boundary condition is taken, and the segmental model is established and calculated. The results are compared with the results of multi-scale model. 3. The influence of different parameters of steel bridge face slab thickness and U-rib thickness on the stress characteristics of orthotropic steel deck structure is studied, and the reasonable value range of deck thickness and U-rib thickness is given. 4. The scheme design, test test and data analysis of the bridge deck of Rongjiang super bridge are completed, and the results are compared with the theoretical results of multi-scale model, and the structural safety is evaluated. 5. The experimental and theoretical results verify the safety of the design structure.
【學(xué)位授予單位】：中南大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U441;U443.31

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