本文選題：無背索斜拉橋　切入點(diǎn)：有限元　出處：《長安大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：無背索斜塔斜拉橋結(jié)構(gòu)形式新穎獨(dú)特，打破了傳統(tǒng)直塔斜拉橋的設(shè)計(jì)理念。其具有優(yōu)美的外形，橋梁結(jié)構(gòu)無背索豐富了橋梁結(jié)構(gòu)與景觀之間的協(xié)調(diào)關(guān)系。斜拉索不僅為主梁提供彈性支撐，還要依靠斜拉索索力來平衡傾斜的橋塔自重引起的傾覆力矩，正由于主塔結(jié)構(gòu)不設(shè)背索，塔身傾斜，施工難度較大，尤其是主塔的施工過程中線形控制和安全控制尤為關(guān)鍵，目前為止世界范圍內(nèi)已建成的無背索斜拉橋數(shù)量比較少。本文對國內(nèi)外現(xiàn)有的無背索斜拉橋分析，介紹了無背索斜拉橋施工控制的特點(diǎn)、影響因素和施工控制方法。根據(jù)依托工程無背索混凝土斜拉橋的背景資料，采用橋梁專用有限元分析軟件Midas civil2012(V8.0.5)建立施工控制模型進(jìn)行分析，結(jié)合斜塔無背索斜拉橋的結(jié)構(gòu)特點(diǎn)，充分利用斜拉索索力在混凝土主塔施工過程的作用，對混凝土主塔的施工方案進(jìn)行優(yōu)化，并進(jìn)行了安全性驗(yàn)算�？偨Y(jié)出斜塔無背索斜拉橋主塔在施工過程中各個(gè)主塔節(jié)段立模位置各個(gè)方向的預(yù)偏位的通用計(jì)算公式，并在施工階段對主塔懸臂施工的溫度效應(yīng)進(jìn)行分析，考慮年溫度變化對主塔懸臂施工各節(jié)段預(yù)偏位的影響，給出不同溫度下主塔各施工節(jié)段預(yù)偏位的修正值。根據(jù)現(xiàn)場對主塔、主梁的線形及應(yīng)力和斜拉索索力的實(shí)時(shí)監(jiān)控，通過實(shí)測數(shù)據(jù)與理論數(shù)據(jù)的分析對比，，主梁應(yīng)力、主梁線形、主塔應(yīng)力、主塔線形、斜拉索索力均接近理論設(shè)計(jì)水平，來驗(yàn)證本論文提出的優(yōu)化施工方案的可行性。
[Abstract]:The structure of cable-stayed bridge without back cable tower is novel and unique, which breaks the design idea of traditional cable-stayed bridge with straight tower. The bridge structure without back cable enriches the harmonious relationship between the bridge structure and the landscape. The cable not only provides elastic support for the main beam, but also relies on the cable force to balance the overturning moment caused by the self-weight of the inclined tower. Because the main tower structure has no back cable and the tower body is inclined, it is difficult to construct, especially the linear control and safety control are very important in the construction process of the main tower. So far, the number of cable-stayed bridges without back cable has been few in the world. This paper analyzes the existing cable-stayed bridges without back cables at home and abroad, and introduces the characteristics of construction control of cable-stayed bridges without back cables. According to the background data of the concrete cable-stayed bridge without back cable, the construction control model is established by using the special finite element analysis software Midas civil 2012V8.0.5), and the structural characteristics of the cable-stayed bridge without back cable are combined. The construction scheme of concrete main tower is optimized by making full use of the effect of cable-stayed cable force in the construction process of concrete main tower. The safety checking calculation is carried out, and the general calculation formula of the pre-deflection of the main tower of the cable-stayed bridge without back cable in each direction of the main tower section position during the construction process is summarized. The temperature effect of the main tower cantilever construction is analyzed in the construction stage. Considering the influence of annual temperature change on the pre-deflection position of the main tower cantilever construction section, the correction value of the main tower construction section pre-deflection position under different temperatures is given. Through the analysis and comparison between the measured data and the theoretical data, it is found that the stress of the main beam, the linear shape of the main beam, the stress of the main tower, the linear force of the main tower and the cable force of the stay cable are all close to the theoretical design level. To verify the feasibility of the optimal construction scheme proposed in this paper.
【學(xué)位授予單位】：長安大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U445.4

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