【摘要】：斜拉橋是一種由主梁、主塔和斜拉索構(gòu)成的高次超靜定的柔性結(jié)構(gòu)。在靜力作用下,斜拉橋結(jié)構(gòu)是否會表現(xiàn)出明顯的幾何非線性特征?在斜拉橋的鋼箱梁懸臂拼裝時,吊機(jī)作用梁段和吊裝梁段之間是否會產(chǎn)生較大的相對變形?這些都是本文研究的問題。本文以南寧市五象大橋為工程背景,該橋為雙塔獨(dú)柱式分離式鋼箱梁斜拉橋。其獨(dú)特之處在于其雙索面的斜拉索錨固在分離式鋼箱梁內(nèi)腹板上,且其橫向間距僅為6m。這些既有的特點,體現(xiàn)了這種近似單索面斜拉索形式的斜拉橋的研究價值。本文的主要研究內(nèi)容如下:(1)在斜拉橋施工過程中結(jié)構(gòu)的剛度較小,幾何非線性對結(jié)構(gòu)有一定的影響�；趯π崩瓨驇缀畏蔷�性的研究,詳細(xì)闡述了影響斜拉橋幾何非線性的三種因素:斜拉索垂度效應(yīng)、梁柱效應(yīng)、大位移效應(yīng),并介紹其在有限元軟件中的模擬方法。(2)使用Midas/Civil建立五象大橋的線性計算有限元模型;并在此模型基礎(chǔ)上分別建立了考慮斜拉索垂度效應(yīng)、考慮大位移效應(yīng)和考慮完全非線性的有限元計算模型;研究了各種幾何非線性因素對斜拉橋各個施工階段的影響,并對比分析了各幾何非線性效應(yīng)影響的變化規(guī)律,最后得出了有益于以后設(shè)計和施工監(jiān)控的結(jié)論。(3)首先,使用大型通用有限元軟件ANSYS 14.5建立五象大橋分離式鋼箱梁的板殼單元模型;其次,通過分析斜拉橋懸臂拼裝階段鋼箱梁拼裝端口的相對變形,提出了適用于該類型斜拉橋鋼箱梁的制作和拼裝的建議;再次,通過對比分析不同縱隔板類型對鋼箱梁拼裝端口的相對變形的影響,提出了適用于該類型斜拉橋鋼箱梁的縱隔板類型選擇的建議;最后,通過分析橋面吊機(jī)縱向和橫向站位對鋼箱梁拼裝端口的相對變形的影響,提出了適用于該類型斜拉橋的橋面吊機(jī)站位的建議。
[Abstract]:Cable-stayed bridge is a kind of high order statically indeterminate flexible structure composed of main beam, main tower and stay cable. Under the static force, will the cable-stayed bridge structure show obvious geometric nonlinear characteristics? When the steel box girder cantilever of cable-stayed bridge is assembled, will there be large relative deformation between the crane acting beam section and the lifting beam section? These are the problems studied in this paper. This paper takes Wuxiang Bridge of Nanning City as the engineering background, this bridge is double tower and single column separated steel box girder cable-stayed bridge. Its unique feature is that the cable-stayed cables of the double cable plane are anchored on the internal web of the separated steel box girder, and the transverse spacing is only 6 m. These existing characteristics reflect the research value of this kind of cable-stayed bridge, which is similar to single cable plane cable-stayed bridge. The main contents of this paper are as follows: (1) in the construction of cable-stayed bridge, the stiffness of the structure is small, and geometric nonlinearity has a certain influence on the structure. Based on the study of geometric nonlinearity of cable-stayed bridges, three factors affecting geometric nonlinearity of cable-stayed bridges are described in detail: cable sag effect, Liang Zhu effect and large displacement effect. The simulation method in finite element software is introduced. (2) the linear finite element model of Wuxiang Bridge is established by using Midas/Civil; On the basis of the model, the finite element model considering the cable sag effect, the large displacement effect and the complete nonlinearity is established. The influence of various geometric nonlinear factors on the construction stage of cable-stayed bridge is studied, and the variation law of each geometric nonlinear effect is compared and analyzed. Finally, the conclusion is drawn that it is beneficial to the design and construction monitoring in the future. (3) first of all, The plate-shell element model of the separated steel box girder of Wuxiang Bridge is established by using the large-scale general finite element software ANSYS 14.5. Secondly, by analyzing the relative deformation of the steel box girder assembly ports in the cantilever assembly stage of the cable-stayed bridge, the suggestions for making and assembling the steel box girder of the cable-stayed bridge are put forward. Thirdly, by comparing and analyzing the influence of different types of mediastinal plates on the relative deformation of steel box girder assembly ports, some suggestions for selecting the type of steel box girder for this type of cable-stayed bridge are put forward. Finally, based on the analysis of the influence of the longitudinal and lateral stations of the deck crane on the relative deformation of the steel box girder assembly ports, the suggestion of the station position of the bridge deck crane suitable for this type of cable-stayed bridge is put forward.
【學(xué)位授予單位】：長沙理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U441;U448.27

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