【摘要】：獨(dú)塔斜拉橋技術(shù)含量高,施工難度大,主梁的施工控制問題是保證斜拉橋達(dá)到合理成橋狀態(tài)的關(guān)鍵。由于獨(dú)塔斜拉橋具有較好的受力性能和良好的抗收縮徐變能力,同等條件下,獨(dú)塔斜拉橋與雙塔斜拉橋相比不僅可以省掉一個(gè)基礎(chǔ),還可以通過設(shè)置較長(zhǎng)的無(wú)索區(qū)大幅減少拉索用量,經(jīng)濟(jì)性能優(yōu)越。本論文以新井岡山大橋工程為背景,通過新井岡山大橋三維空間有限元模型的建立,重點(diǎn)研究了鋼主梁懸拼過程中的結(jié)構(gòu)內(nèi)力及斜拉索索力的施工控制問題。同時(shí),對(duì)橋梁結(jié)構(gòu)參數(shù)的敏感性也進(jìn)行了分析探討,主要研究?jī)?nèi)容如下:(1)結(jié)合獨(dú)塔斜拉橋施工監(jiān)控的內(nèi)容、方法以及原則,選用橋梁分析計(jì)算軟件-Midas/Civil,分別模擬了新井岡山大橋施工過程中鋼主梁、斜拉索的受力情況,驗(yàn)證了該有限元模型在實(shí)際工程中的適用性。(2)選用Midas/Civil軟件,采用正裝法對(duì)鋼主梁懸臂拼裝過程進(jìn)行仿真模擬分析,得出施工過程中鋼主梁內(nèi)力分布不利位置,以及最大施工荷載對(duì)鋼主梁內(nèi)力分布不利位置的影響。(3)以頻率法為基礎(chǔ),采用有限元計(jì)算軟件,分析了單根斜拉索損傷對(duì)自身索力值的影響,及對(duì)其它斜拉索受力狀態(tài)的影響,進(jìn)而得出了單根斜拉索索力值調(diào)整對(duì)其它斜拉索索力值的影響規(guī)律。(4)通過有限元計(jì)算軟件,分析了溫度荷載、施工荷載、斜拉索索力值等主要參數(shù)的敏感性,比較了敏感性變化對(duì)斜拉橋主梁線形和斜拉索索力的影響情況,為有限元基本參數(shù)的選取打下了基礎(chǔ)。
[Abstract]:Single tower cable-stayed bridge has high technical content and construction difficulty. The construction control of main girder is the key to ensure the cable-stayed bridge to reach a reasonable state of completion. Because the single tower cable-stayed bridge has better mechanical performance and good anti-shrinkage and creep ability, under the same conditions, the single-tower cable-stayed bridge can not only save a foundation compared with the double-tower cable-stayed bridge. Can also set a longer cable-free area significantly reduce the amount of cable, superior economic performance. This paper takes the new Jinggangshan Bridge as the background, through the establishment of the three-dimensional finite element model of the New Jinggangshan Bridge, focuses on the construction control of the structural internal force and the cable-stayed cable force in the process of the steel main beam hanging and assembling. At the same time, the sensitivity of bridge structural parameters is analyzed and discussed. The main research contents are as follows: (1) combined with the content, method and principle of single tower cable-stayed bridge construction monitoring, the bridge analysis and calculation software-Midas/Civil, is selected. The stress situation of steel main beam and cable during the construction of Xinjinggangshan Bridge is simulated, and the applicability of the finite element model in practical engineering is verified. (2) Midas/Civil software is selected. The steel main girder cantilever assembly process is simulated and analyzed by using the straight fitting method, and the unfavorable position of the internal force distribution of the steel main girder is obtained during the construction process. And the influence of maximum construction load on the unfavorable position of internal force distribution of steel main girder. (3) based on the frequency method, the influence of single cable damage on its own cable force is analyzed by using finite element calculation software. And the influence on the stress state of other cable-stayed cables, and the influence law of the adjustment of the single cable force on the other cable-stayed cable forces is obtained. (4) through the finite element calculation software, the temperature load and the construction load are analyzed. The sensitivity of the main parameters, such as cable force value, is compared, and the influence of the change of sensitivity on the line shape and cable force of the main girder of cable-stayed bridge is compared, which lays a foundation for the selection of the basic parameters of the finite element method.
【學(xué)位授予單位】：湖北工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：U445.4;U448.27

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