【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構形式。其具有環(huán)境友好、建筑景觀適應性好和運營成本低等優(yōu)點。U型箱型組合梁結構明顯區(qū)別于傳統(tǒng)的箱梁、T梁和槽型梁,對其靜力行為方面的研究在國內尚處空白。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,對以下幾個方面進行研究:(1)采用有限元軟件ABAQUS建立全橋實體單元有限元分析模型。計算和分析U型箱型組合梁整體在單項荷載和荷載組合下橋梁的結構響應。計算表明,該結構的剛度較大,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角遠小于規(guī)范容許值。在結構參數(shù)影響分析中,本文重點分析了道床板板厚、橋梁寬跨比和高跨比對其受力性能的影響,研究發(fā)現(xiàn)U型箱型組合梁的寬跨比對梁的受力影響不大,增加道床板厚度可以增強結構的安全性,改變高跨比對梁的應力和豎向變形會產(chǎn)生明顯影響,其中對U型梁段影響最為顯著。(2)本文對橋梁局部結構的受力機理進行分析。對于U型箱型組合連續(xù)梁,道床板同時作為箱型梁的上翼緣和U型梁的下翼緣,結構受力非常復雜。且由于橋面寬度較大,會產(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的影響因素,得出結論,在U型箱型組合截面段,道床板越厚,剪力滯效應越明顯,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增強;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.
【學位授予單位】：西南交通大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：U441

【參考文獻】

相關期刊論文 前10條

1 孟渭存;;高速鐵路槽型連續(xù)梁施工綜合技術研究[J];價值工程;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號線工程中的應用[J];建設監(jiān)理;2016年06期

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

4 劉翠云;董傳洲;;國外預應力混凝土連續(xù)梁橋發(fā)展和施工技術[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計[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號線中的應用[J];上海建設科技;2009年05期

8 吳迅;張鵬;;預應力混凝土軌道交通高架橋結構形式演化[J];城市軌道交通研究;2009年10期

9 黎慶;;南京地鐵2號線東延高架線路U型梁結構計算及試驗[J];城市軌道交通研究;2009年08期

10 李文勇;;U形梁結構加載模擬試驗的分析和研究[J];中國市政工程;2008年03期

相關博士學位論文 前1條

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

相關碩士學位論文 前5條

1 王文靜;城市軌道交通站點內商業(yè)物業(yè)租賃價格評估[D];西南交通大學;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;2016年

3 忽慧濤;軌道交通U型梁運架施工過程空間力學行為分析[D];山東建筑大學;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研究[D];西南交通大學;2011年

5 汪金輝;道砟橋面槽型梁結構受力性能研究[D];中南大學;2009年

，

本文編號：2447716