本文選題：鋼桁梁斜拉橋　切入點(diǎn)：施工控制　出處：《西南交通大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：由于斜拉橋具有跨越能力大的特點(diǎn),在我國跨江跨河橋梁中占據(jù)主導(dǎo)地位。其中,鋼桁梁斜拉橋由于能夠同時(shí)滿足運(yùn)輸公鐵線路的要求,越來越受到橋梁設(shè)計(jì)者的青睞。為了確保分階段成形的鋼桁梁斜拉橋最終達(dá)到理想的設(shè)計(jì)狀態(tài),對(duì)鋼桁梁斜拉橋的施工控制進(jìn)行研究極為必要。鋼桁梁斜拉橋由于其特定的主梁形式,施工控制又有特殊之處。本文在綜述前人研究的基礎(chǔ)上,以荊州公鐵兩用橋?yàn)楣こ瘫尘?從總體和實(shí)用的角度,總結(jié)并研究了鋼桁梁斜拉橋的施工控制方法。論文的主要工作如下:(1)使用3DBridge有限元軟件建立荊州長江公鐵兩用橋分階段施工有限元模型,利用無應(yīng)力狀態(tài)控制法確定出雙塔鋼桁梁斜拉橋各施工階段的理想狀態(tài),并把分階段施工橋梁的最終狀態(tài)與設(shè)計(jì)一次成橋狀態(tài)進(jìn)行對(duì)比,二者是吻合的。(2)在調(diào)整施工中理論狀態(tài)與實(shí)際狀態(tài)的誤差時(shí),從無應(yīng)力狀態(tài)量、荷載和結(jié)構(gòu)體系三個(gè)方面對(duì)設(shè)計(jì)參數(shù)誤差進(jìn)行歸類,說明了以"相對(duì)拔出量"控制斜拉索到位張拉來減小施工誤差的原理,并按照實(shí)際施工條件選取了引起鋼桁梁斜拉橋施工狀態(tài)誤差的主要設(shè)計(jì)參數(shù)為:主塔剛度、拉索剛度、主梁自重、主梁剛度,然后采用改進(jìn)的最小二乘法原理,選取一個(gè)"拉索—架梁"的典型工況分別依靠"平差調(diào)索"和參數(shù)識(shí)別對(duì)誤差進(jìn)行調(diào)整,取得了理想的效果。(3)研究了鋼桁梁雙斜桿合龍口的合龍技術(shù),按照施工難易程度和對(duì)合龍口構(gòu)件的保護(hù)能力提出合龍方案。通過有限元模型計(jì)算確定出每一步合龍對(duì)接時(shí)的調(diào)整措施和調(diào)整量,并對(duì)實(shí)際合龍時(shí)可能出現(xiàn)的不利狀況提出預(yù)警方案,最后介紹了荊州橋采用上述方案后的實(shí)際合龍過程及效果。本論文研究成果對(duì)于指導(dǎo)鋼桁梁斜拉橋施工控制具有重要理論參考價(jià)值。
[Abstract]:Because cable-stayed bridges have the characteristics of large span capacity, they occupy a dominant position in the cross-river bridges in China. Among them, the steel-truss cable-stayed bridges can meet the requirements of the transport road and rail lines at the same time. In order to ensure that the steel-truss girder cable-stayed bridge formed by stages finally reaches the ideal design state, It is very necessary to study the construction control of steel truss cable-stayed bridge. Because of its special main beam form, the construction control of steel truss cable-stayed bridge has its special features. In this paper, the construction control method of steel truss cable-stayed bridge is summarized and studied from the overall and practical point of view. The main work of this paper is as follows: 1) using 3DBridge finite element software to establish the three-stage finite element model for the construction of Jingzhou Yangtze River double-purpose bridge. The ideal state of double-tower steel truss girder cable-stayed bridge is determined by using the stress-free state control method, and the final state of the bridge is compared with that of the designed primary bridge. When adjusting the errors between the theoretical state and the actual state in construction, the errors of design parameters are classified from three aspects: the quantity of stress free state, the load and the structure system. This paper explains the principle of using relative pull out quantity to control the cable in place tension to reduce the construction error. According to the actual construction conditions, the main design parameters that cause the construction state error of the steel truss girder cable-stayed bridge are selected as follows: the main tower stiffness and the cable stiffness. The deadweight and stiffness of the main beam, and then adopting the principle of the improved least square method, select a typical condition of "cable-beam" to adjust the error by "adjustment cable" and parameter identification, respectively. The ideal effect is obtained. (3) the closing technology of steel truss beam with double inclined bars and the closing of the opening is studied. According to the degree of difficulty in construction and the protection ability of the involutive Longkou members, the closure scheme is put forward. The adjustment measures and the adjustment amount of each step are determined by the finite element model calculation. And put forward an early warning plan for the adverse situation that may occur when the actual closure occurs. Finally, the actual closure process and effect of Jingzhou Bridge after adopting the above scheme are introduced. The research results of this paper have important theoretical reference value for guiding the construction control of steel truss cable-stayed bridge.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：U445.4

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