本文選題：大跨度拱橋　切入點：鋼-混組合拱橋　出處：《重慶交通大學》2014年碩士論文　論文類型：學位論文

【摘要】：本文針對特大跨拱橋,提出主拱圈拱腳區(qū)段采用鋼筋混凝土箱、跨中區(qū)段采用鋼箱的鋼-混組合拱橋方案,以達到增大拱橋跨徑、合理運用材料、減輕拱圈自重的目的。圍繞鋼-混組合拱橋的施工問題,提出混凝土拱圈采用懸臂澆筑法施工,鋼箱采用纜索吊裝法施工的組合施工方案,利用有限元程序開展施工階段力學行為分析。本文主要工作與成果如下： ①以凈跨徑420m的重慶萬州長江大橋為原型,開展鋼-混組合拱橋試設計,主拱圈拱腳100m區(qū)段設計為單箱三室鋼筋混凝土截面,跨中220m區(qū)段為單箱三室鋼箱截面。對拱軸系數、矢跨比、拱上建筑、鋼-混接頭等構造進行初步研究,將拱厚系數、鋼混分段點位置作為參數,建立ANSYS有限元空間模型,對參數變化引起的拱圈內力、拱軸系數、穩(wěn)定系數變化進行研究,得出適合鋼-混組合拱橋的設計參數范圍。 ②根據現(xiàn)行公路橋涵設計規(guī)范和鋼結構設計規(guī)范,用Midas/Civil和ANSYS兩個有限元軟件建立計算模型,進行主拱圈截面承載力驗算和穩(wěn)定性分析,驗證試設計的可行性。 ③為減小混凝土拱圈懸臂澆筑節(jié)段的重量,加快澆筑速度,提出將拱圈分為兩個邊箱和一個中箱頂底板,兩個混凝土邊箱采用懸臂澆筑法施工,兩個鋼拱箱邊箱采用纜索吊裝法安裝,實現(xiàn)兩邊箱單箱合龍,合龍后先安裝焊接鋼拱箱頂底板,再立模澆筑混凝土中箱頂底板,最終松開扣索,形成主拱圈結構。 ④針對鋼箱區(qū)段纜索吊裝施工,提出鋼箱整體提升、分節(jié)段吊裝兩種方案,并采用ANSYS有限元軟件對主拱圈施工過程進行模擬計算,對兩種施工過程中截面應力、扣索索力、拱圈變形等進行對比分析,得出混凝土區(qū)段懸臂澆筑、鋼區(qū)段整體提升、鋼區(qū)段分節(jié)段吊裝情況下的混凝土拱圈力學行為規(guī)律。
[Abstract]:In this paper, the reinforced concrete box is used in the arch foot section of the main arch ring and the steel-concrete composite arch bridge with steel box in the middle span section is put forward, so as to increase the span of the arch bridge and make reasonable use of materials. The purpose of reducing the dead weight of arch ring is to put forward the combined construction scheme of concrete arch ring by cantilever pouring method and steel box by cable hoisting method around the construction problem of steel-concrete composite arch bridge. The finite element program is used to analyze the mechanical behavior in the construction stage. The main work and results of this paper are as follows:. 1. Taking Wanzhou Yangtze River Bridge with a net span of 420 m as prototype, the trial design of steel-concrete composite arch bridge is carried out. The section of 100m arch foot of main arch ring is designed as single box and three-compartment reinforced concrete section, and the section of middle 220m span is single box three-chamber steel box section. The structure of rise-span ratio, arch building and steel-mixing joint are studied preliminarily. The ANSYS finite element space model is established by taking the arch thickness coefficient and the position of steel concrete segment as parameters, and the internal force of arch ring and the coefficient of arch axis caused by the change of parameters are studied. The range of design parameters suitable for steel-concrete composite arch bridge is obtained by studying the variation of stability coefficient. 2 according to the current design code of highway bridge and culvert and the design code of steel structure, the calculation model is established by Midas/Civil and ANSYS, and the bearing capacity of the main arch ring section is checked and the stability analysis is carried out to verify the feasibility of the test design. In order to reduce the weight of the cantilever section of concrete arch ring and speed up the pouring speed, the arch ring is divided into two side boxes and one middle box top and bottom slab, and the two concrete edge boxes are constructed by cantilever pouring method. Two steel arch box side boxes are installed by cable hoisting method to realize the closure of both sides of the single box. After closing the box, the welding steel arch box top and bottom plate is installed first, then the vertical die pouring concrete middle box top and bottom slab, finally loosening the buckle cable, forming the main arch ring structure. 4 in view of cable hoisting construction in steel box section, two schemes of steel box integral lifting and segmental lifting are put forward, and the construction process of main arch ring is simulated and calculated by ANSYS finite element software. The cross-section stress and cable buckling force are calculated during the construction process. By comparing and analyzing the deformation of arch ring, the mechanical behavior of concrete arch ring is obtained under the condition of cantilever pouring in concrete section, integral lifting of steel section and hoisting of steel section.
【學位授予單位】：重慶交通大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：U445.4

【參考文獻】

相關期刊論文 前10條

1 陳寶春;;鋼-混凝土組合拱橋技術[J];重慶交通大學學報(自然科學版);2011年S2期

2 韓艷,陳政清;茅草街大橋動力特性有限元模擬與分析[J];公路;2003年03期

3 鄒中權;賀國京;吳再新;李媛媛;;大跨拱橋吊裝施工線形控制計算方法研究[J];公路交通科技;2009年12期

4 田軍偉;鄭罡;唐光武;陳江華;;重慶石板坡長江大橋復線橋鋼-混凝土接頭模型靜載與疲勞試驗研究[J];公路交通技術;2007年02期

5 陳寶健,許有勝,陳寶春;日本鋼筋混凝土拱橋調查與分析[J];中外公路;2005年04期

6 陳寶春;黃卿維;;600m跨徑混凝土拱橋的試設計研究[J];中外公路;2006年01期

7 李躍;羅甲生;郭欣;潘盛烈;劉斌;任衛(wèi)東;;廣州新光大橋主跨主拱中段大段整體提升架設[J];中外公路;2006年02期

8 陳寶春;葉琳;;我國混凝土拱橋現(xiàn)狀調查與發(fā)展方向分析[J];中外公路;2008年02期

9 Vinko 酓andrlic,林廣元;懸臂施工大跨度混凝土拱橋的發(fā)展[J];國外橋梁;1981年03期

10 范瑛,梅利芳;日本富士川混凝土拱橋的設計與施工[J];世界橋梁;2002年02期

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