本文關鍵詞： 雙主梁斜拉橋 橫隔梁 成橋狀態(tài) 施工階段 簡化模型 受力分析　出處：《哈爾濱工業(yè)大學》2015年碩士論文　論文類型：學位論文

【摘要】：混凝土雙主梁斜拉橋是目前橋梁工程中越來越普遍采用的一種結構形式,其主梁截面由兩邊主梁和橋面板組成,橋面寬度較大,兩邊主梁的橫向聯(lián)系相對較弱。雙主梁斜拉橋的橫隔梁是保證主梁橫向剛度的重要構件,其可靠與否是整座橋梁安全運營的重要保障,因此橫隔梁的設計成為雙主梁斜拉橋設計中的重要一環(huán)。對于橫隔梁的設計,絕大多數(shù)工程師為了計算方便而采用簡化的桿系模型,從而導致橫隔梁內力計算誤差較大。本文以遼寧省朝陽市珠江橋為工程背景,討論了橫隔梁的作用,從成橋狀態(tài)和施工階段詳細分析了各荷載作用下橫隔梁的受力特點,并提出了修正的橫隔梁簡化計算模型,同時對比了不同預應力筋張拉方案對橫隔梁受力均勻性的影響。首先,本文利用Midas/Fea建立了全橋實體模型,通過對比有、無橫隔梁兩種情況,從成橋整體受力、橋面板受力和主梁抗扭性能三個方面探討了橫隔梁在雙主梁斜拉橋中的作用。分析結果表明,橫隔梁能夠提高主梁截面的橫向剛度,減小邊主梁與橋面板的相對變形,大幅度減小橋面板的橫向應力,同時能夠增強主梁在偏載作用下的抗扭性能。其次,本文通過對比目前橫隔梁的三種簡化計算方法與準確模型各荷載作用下的應力差值,對各簡化模型進行了評價,得出簡化模型準確度由高到低排序依次為節(jié)段實體模型法、簡支梁法、固結梁法�；谀Ｐ头治�,通過修正桿系模型的計算截面和邊界條件,提出了滿足工程精度的修正橫隔梁簡化模型。最后,本文建立了Midas/Fea施工階段實體模型,分析了懸臂施工過程中自重、預應力、索力作用下橫隔梁的應力變化規(guī)律。結果表明,隨著離新澆筑橫隔梁距離的增加,各荷載對已澆筑橫隔梁產生的附加應力逐漸減小,其中自重的影響范圍在6道橫隔梁左右,預應力的影響范圍在3道橫隔梁左右,索力對已澆筑橫隔梁的附加應力可忽略不計。針對珠江橋,對比了橫隔梁預應力筋三種張拉方案對橫隔梁受力的影響,得出一次落架狀態(tài)橫隔梁受力最均勻,預應力筋一次張拉和分批張拉兩種方案下橫隔梁受力均勻無顯著差異。
[Abstract]:Concrete double girder cable-stayed bridge is a structure form of the bridge engineering more and more widely used, the main girder is composed of both girder and bridge deck, bridge deck width is large, horizontal contact on both sides of the main girder is relatively weak. Double girder cable-stayed bridge is an important component of cross beam to ensure the lateral stiffness of the main girder. Reliability is an important guarantee for the safe operation of the bridge, so the cross beam design into the design of double girder cable-stayed bridge is an important part of the design. The cross beam, the vast majority of engineers in order to facilitate the calculation by using the simplified model of bar system, resulting in cross beam internal force calculation error in this paper. In Liaoning Province, Chaoyang City Pearl River Bridge as the engineering background, discusses the effect of cross beam, from the finished bridge state and the construction stage are analyzed. The loading force of diaphragm beam characteristics, and brings forward the modified diaphragm beam. The calculation model, and effects of different tensioning schemes on the transverse beam uniformity were compared. First, Midas/Fea established a solid model of the whole bridge in this paper, by contrast, no cross beam two, from the bridge into the overall stress, discusses the cross beam in double girder cable-stayed the bridge in three aspects of torsion force and girder bridge deck. The analysis results show that the cross beam can improve the lateral stiffness of the main girder, the relative deformation decreases beam and bridge deck, transverse stress greatly reduce the bridge panel, at the same time can enhance the girder torsional performance in partial load next. Secondly, through the comparison of the three kinds of simplified cross beam calculation method and accurate model of the load stress difference, the simplified model was evaluated, the simplified model accuracy from high to low rank as model segment Method, beam method, consolidation beam method. Based on the analysis of the model, by modifying the bar calculation section and the boundary condition model, put forward to meet the engineering precision correction cross beam model. Finally, this paper established the entity Midas/Fea construction stage model, analyzes the cantilever construction process of prestressed cable, weight, force transverse stress variation of beam. The results show that with the increase of distance from the new pouring of cross beam, the cross beam has been pouring load on the additional stress decreases gradually, which affect the range of weight in the 6 way cross beam, influence range of pre stress in the 3 way cross beam about cable force of diaphragm beam has been pouring additional stress can be neglected. In view of the Pearl River Bridge, influence of cross beam prestressed reinforcement tension scheme of three cross beams were compared, obtained a falling state of cross beams is the most uniform, pre stress reinforced a piece Pull and batch tension under the two kinds of schemes of cross beams with uniform no significant difference.

【學位授予單位】：哈爾濱工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：U441;U448.27

【引證文獻】

相關會議論文 前2條

1 詹建輝;顏東煌;;用綜合方法確定PC斜拉橋的成橋狀態(tài)[A];中國公路學會橋梁和結構工程學會2002年全國橋梁學術會議論文集[C];2002年

2 顏志;劉大中;陳德偉;;斜拉橋箱梁有無橫隔梁性能對比研究[A];第二十一屆全國橋梁學術會議論文集（上冊）[C];2014年

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本文編號：1542079