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混合連續(xù)梁橋接頭部位受力研究

發(fā)布時間:2018-05-20 02:28

  本文選題:混合橋 + 組合梁。 參考:《吉林建筑大學》2014年碩士論文


【摘要】:近年來,隨著大跨徑橋梁不斷的發(fā)展,鋼—混凝土混合結構被很多大跨徑橋梁所采用。這種混合結構充分發(fā)揮了混凝土與鋼的優(yōu)勢,這種結構整體性好,,剛度大,承載能力強,動力性能好,自重小,而且施工比其他結構方便,使得橋梁性能上得到大幅提高。 在鋼-混凝土混合梁橋中,鋼箱梁與混凝土梁通過接頭進行連接,由于鋼與混凝土是剛度與強度不同的兩種材料,所以接頭部位在受力作用下,接頭的外形尺寸發(fā)生突變容易引起接頭結構局部的內力增大。鋼-混凝土接頭是混合結構中的薄弱之處。 本文以重慶長江大橋復線橋為背景工程,該橋梁2006年9月24日竣工通車。該橋采用預應力混凝土連續(xù)梁橋和連續(xù)剛構橋組合形式,橋跨布置為87.75+2×138(預應力混凝土連續(xù)梁橋結構)+2×138+330(鋼箱梁主跨)+132.5(連續(xù)鋼構結構)。主跨由左右兩側111m預應力混凝土懸臂和中間108m鋼箱梁形成鋼混組合式結構。該橋主跨達330m,打破此類橋梁的最大跨徑的世界紀錄,該橋為了避免由于預應力連續(xù)剛構自重產(chǎn)生的過大的應力而難以提高跨越能力的問題,在主跨330m中采用108m鋼箱梁,這樣有效的解決了預應力混凝土連續(xù)剛構自重過大影響跨越能力的問題。 組合梁充分發(fā)揮了混凝土與鋼梁受力時各自的優(yōu)點,因此組合梁具有承載力高的優(yōu)點,同時組合梁還具有自重小,減弱地震作用,施工方便,結構延性好等其他一些優(yōu)點。組合梁這種結構被廣泛的應用到結構設計中。鑒于組合梁的這些特點,本文在重慶長江大橋復線橋的原橋基礎上擬定新的混合結構形式:將原橋330m主跨中的108m鋼箱梁用組合梁替換,然后對結合段處的接頭進行動力分析,分析混凝土—組合梁接頭受力情況。 本文工作內容主要有: (1)收集、整理有關文獻總結混合結構和接頭的有關理論和研究現(xiàn)狀。 (2)利用MIDAS CIVIL建立原橋模型和新的組合-混凝土混合梁有限元模型。分別計算出兩種模型接頭處在地震作用下的最不利荷載組合。 (3)利用有限元軟件ANSYS建立鋼-混凝土接頭與組合-混凝土接頭有限元模型,進行靜力分析。 (4)得出接頭各個構件應力計算結果,進行詳細的對比分析,初步得出混合梁接頭在地震作用下的應力范圍和應力分布規(guī)律,提出意見。
[Abstract]:In recent years , with the continuous development of large - span bridges , the hybrid structure of steel - concrete has been adopted by many large - span bridges . This hybrid structure gives full play to the advantages of concrete and steel , and the structure is good in integrity , large in rigidity , strong in bearing capacity , good in power performance , small in dead weight , and convenient in construction than other structures , so that the bridge performance is greatly improved .

in that steel - concrete composite beam bridge , the steel box beam and the concrete beam are connected through a joint , because the steel and the concrete are two materials with different rigidity and strength , the external dimension of the joint can easily cause the local internal force of the joint structure to increase under the action of stress , and the steel - concrete joint is weak in the mixed structure .

This paper takes Chongqing Yangtze River Bridge as background project . The bridge is completed on September 24 , 2006 . The bridge is composed of prestressed concrete continuous beam bridge and continuous rigid frame bridge . The bridge span is 87.75 + 2 脳 138 ( prestressed concrete continuous beam bridge structure ) + 2 脳 138 + 330 ( steel box girder main span ) + 132.5 ( continuous steel structure ) .

The composite beam has the advantages of high bearing capacity , and the combined beam has the advantages of small dead weight , reduced earthquake action , convenient construction , good structural ductility , etc . The composite beam has many advantages such as small dead weight , reduced earthquake action , convenient construction and good structural ductility .

The main contents of this paper are as follows :

( 1 ) Collect and arrange relevant literatures to summarize the relevant theories and research status of hybrid structures and joints .

( 2 ) The finite element model of the original bridge model and the new composite - concrete composite beam is established by using MIDAS truss . The most unfavorable load combinations of two model joints under earthquake are calculated .

( 3 ) The finite element model of steel - concrete joint and composite - concrete joint is established by finite element software ANSYS , and static analysis is carried out .

( 4 ) obtaining the stress calculation results of each component of the joint , carrying out detailed comparative analysis , and preliminarily obtaining the stress range and the stress distribution rule of the mixed beam joint under the earthquake action , and putting forward opinions .
【學位授予單位】:吉林建筑大學
【學位級別】:碩士
【學位授予年份】:2014
【分類號】:U441

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