【摘要】：U型箱型組合梁是槽型梁在城市軌道交通中演化出的一種新的結(jié)構(gòu)形式。其具有環(huán)境友好、建筑景觀適應(yīng)性好和運(yùn)營(yíng)成本低等優(yōu)點(diǎn)。U型箱型組合梁結(jié)構(gòu)明顯區(qū)別于傳統(tǒng)的箱梁、T梁和槽型梁,對(duì)其靜力行為方面的研究在國(guó)內(nèi)尚處空白。本文以軌道交通(30+48+30) mU型箱型組合連續(xù)梁為工程背景,對(duì)以下幾個(gè)方面進(jìn)行研究:(1)采用有限元軟件ABAQUS建立全橋?qū)嶓w單元有限元分析模型。計(jì)算和分析U型箱型組合梁整體在單項(xiàng)荷載和荷載組合下橋梁的結(jié)構(gòu)響應(yīng)。計(jì)算表明,該結(jié)構(gòu)的剛度較大,雙線加載工況下,跨中截面道床板整體下?lián)?并伴有局部下凹變形,道床板最大豎向變形和腹板轉(zhuǎn)角遠(yuǎn)小于規(guī)范容許值。在結(jié)構(gòu)參數(shù)影響分析中,本文重點(diǎn)分析了道床板板厚、橋梁寬跨比和高跨比對(duì)其受力性能的影響,研究發(fā)現(xiàn)U型箱型組合梁的寬跨比對(duì)梁的受力影響不大,增加道床板厚度可以增強(qiáng)結(jié)構(gòu)的安全性,改變高跨比對(duì)梁的應(yīng)力和豎向變形會(huì)產(chǎn)生明顯影響,其中對(duì)U型梁段影響最為顯著。(2)本文對(duì)橋梁局部結(jié)構(gòu)的受力機(jī)理進(jìn)行分析。對(duì)于U型箱型組合連續(xù)梁,道床板同時(shí)作為箱型梁的上翼緣和U型梁的下翼緣,結(jié)構(gòu)受力非常復(fù)雜。且由于橋面寬度較大,會(huì)產(chǎn)生較為明顯的剪力滯現(xiàn)象。本文分析了 U梁腹板的受力情況及道床板剪力滯效應(yīng)的影響因素,得出結(jié)論,在U型箱型組合截面段,道床板越厚,剪力滯效應(yīng)越明顯,在跨中截面及在U型箱型組合截面向U型截面過渡段,由于截面形式的變化使得道床板剪力滯效應(yīng)增強(qiáng);在U型箱型組合截面段,隨著道床板寬度的增加,道床板上表面的剪力滯現(xiàn)象增大,在U型截面段,道床板寬度的變化對(duì)剪力滯的影響不大。
[Abstract]:U-shaped box composite beam is a new structural form of groove beam in urban rail transit. It has the advantages of friendly environment, good adaptability of architectural landscape and low operating cost. The U-shaped box composite beam structure is obviously different from the traditional box girder, T-beam and groove beam, and the research on its static behavior is still blank in our country. In this paper, based on the engineering background of rail transit (304830) mu type composite continuous beam, the following aspects are studied: (1) the finite element analysis model of full bridge solid element is established by using the finite element software ABAQUS. The structural response of U-shaped box composite beam under single load and load combination is calculated and analyzed. The calculation shows that the stiffness of the structure is large. Under the condition of double-line loading, the overall deflection of the cross-section channel bed plate is accompanied by local concave deformation, and the maximum vertical deformation and the web rotation angle of the channel bed plate are far less than the allowable value of the code. In the influence analysis of structural parameters, the influence of slab thickness, ratio of width to span and ratio of height to span on its mechanical performance is emphatically analyzed. It is found that the width-span ratio of U-shaped box-shaped composite beam has little effect on the mechanical behavior of the beam. Increasing the thickness of the slab can enhance the safety of the structure, and changing the ratio of height to span will have an obvious effect on the stress and vertical deformation of the beam, among which the U-shaped beam has the most significant effect. (2) the mechanical mechanism of the local structure of the bridge is analyzed in this paper. For U-shaped box composite continuous beam, the track bed plate acts as both the upper flange of the box beam and the lower flange of the U-shaped beam, so the structural load is very complex. And because the width of the bridge deck is larger, the shear lag phenomenon will be more obvious. In this paper, the stress condition of U beam web plate and the influence factors of shear lag effect on U beam web plate are analyzed, and the conclusion is drawn that the thicker the pavement bed plate is, the more obvious the shear lag effect should be in the U shaped box composite section. In the middle span section and the transition section from U-shaped composite section to U-section, the shear lag effect of pavement bed plate is enhanced due to the change of cross-section form. In the U-shaped box composite section, with the increase of the width of the slab, the phenomenon of shear lag on the surface of the slab increases. In the U-section, the change of the width of the slab has little effect on the shear lag.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：U441

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 孟渭存;;高速鐵路槽型連續(xù)梁施工綜合技術(shù)研究[J];價(jià)值工程;2016年28期

2 曾華;;雙U箱型變截面連續(xù)梁在上海軌道交通17號(hào)線工程中的應(yīng)用[J];建設(shè)監(jiān)理;2016年06期

3 聶建國(guó);胡紅松;;簡(jiǎn)支槽形梁考慮空間受力的理論解[J];工程力學(xué);2012年12期

4 劉翠云;董傳洲;;國(guó)外預(yù)應(yīng)力混凝土連續(xù)梁橋發(fā)展和施工技術(shù)[J];世界橋梁;2011年06期

5 張明儉;劉剛;;軌道交通槽型梁平面與空間受力分析比較[J];路基工程;2011年03期

6 朱琛;;迪拜地鐵線輕軌高架橋設(shè)計(jì)[J];世界橋梁;2011年02期

7 王鳳元;陸元春;吳育芬;;U形梁在上海軌道交通8號(hào)線中的應(yīng)用[J];上海建設(shè)科技;2009年05期

8 吳迅;張鵬;;預(yù)應(yīng)力混凝土軌道交通高架橋結(jié)構(gòu)形式演化[J];城市軌道交通研究;2009年10期

9 黎慶;;南京地鐵2號(hào)線東延高架線路U型梁結(jié)構(gòu)計(jì)算及試驗(yàn)[J];城市軌道交通研究;2009年08期

10 李文勇;;U形梁結(jié)構(gòu)加載模擬試驗(yàn)的分析和研究[J];中國(guó)市政工程;2008年03期

相關(guān)博士學(xué)位論文 前1條

1 王彬力;城市軌道交通U型梁系統(tǒng)結(jié)構(gòu)受力行為研究[D];西南交通大學(xué);2012年

相關(guān)碩士學(xué)位論文 前5條

1 王文靜;城市軌道交通站點(diǎn)內(nèi)商業(yè)物業(yè)租賃價(jià)格評(píng)估[D];西南交通大學(xué);2016年

2 王云云;高速鐵路U型連續(xù)梁橋性能分析及優(yōu)化研究[D];北京交通大學(xué);2016年

3 忽慧濤;軌道交通U型梁運(yùn)架施工過程空間力學(xué)行為分析[D];山東建筑大學(xué);2013年

4 張婷;城市軌道交通荷載作用下的U型梁疲勞損傷性能試驗(yàn)研究[D];西南交通大學(xué);2011年

5 汪金輝;道砟橋面槽型梁結(jié)構(gòu)受力性能研究[D];中南大學(xué);2009年

，

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