【摘要】：施工控制是銜接橋梁設計與施工的關鍵技術環(huán)節(jié)，橋梁施工控制的主要任務是對橋梁施工過程的線形、應力及索力等內容進行有效的控制和調整，確保在整個施工過程中橋梁結構的內力力和變形始終處于安全、可控及合理的范圍之內，并且在成橋以后，橋梁結構的成橋內力和線形均滿足設計要求、與理想目標值的誤差最小。本文以在建的永川長江大橋為背景開展大跨徑混合梁斜拉橋的施工控制方法研究： ①索力—高程控制法。對斜拉橋傳統(tǒng)控制方法索力—高程控制法的實施過程進行了簡單的介紹，并指出了該方法應用于大跨徑混合梁斜拉橋施工控制的局限性。 ②幾何控制法。對幾何控制法進行了簡單的介紹，介紹了幾何控制法的基本觀點和理論基礎；介紹了主塔、主梁單元無應力線形，并對無應力線形的計算方法進行了詳細的論述；對拉索無應力索長計算的兩種理論進行了詳細的介紹：拋物線理論和精確地懸鏈線理論；詳述了如何運用Midas Civil進行幾何控制法的施工控制計算。 ③基于幾何控制法的大跨徑混合梁斜拉橋施工控制的多目標控制法。詳細討論了基于幾何控制法的大跨徑混合梁斜拉橋施工控制的多目標控制法：以結構無應力幾何參數(shù)為主要控制對象，中跨鋼主梁以幾何參數(shù)為基本控制目標，以斜拉索無應力索長為主要調控手段；邊跨混凝土主梁以力學參數(shù)作為基本控制目標，以主梁無應力線形作為線形主要控制手段，以索長、索力雙控作為應力調控的全過程控制方法。 ④以永川長江大橋為依托，對基于幾何控制法的大跨徑混合梁斜拉橋施工控制的多目標控制法的具體實施過程進行了詳細的介紹，，并對施工監(jiān)控的實施結果進行了評價。 ⑤最后對在施工監(jiān)控中遇到的兩個關鍵問題（邊跨混凝土支架的剛度問題、支座摩阻力和邊跨混凝土支架摩阻力問題）進行了簡單的探討。 混合梁斜拉橋外形美觀，具有良好的跨越能力和較強的地形適應性，同等跨度下較全鋼箱梁斜拉橋更加經(jīng)濟，實現(xiàn)了“安全、經(jīng)濟、適用、美觀”的和諧與統(tǒng)一，在我國橋梁大發(fā)展的背景下，有著廣泛的應用前景。本文對今后大跨徑混合梁斜拉橋的施工監(jiān)控有較大的參考價值。
[Abstract]:Construction control is the key technical link connecting bridge design and construction. The main task of bridge construction control is to effectively control and adjust the alignment, stress and cable force of the bridge construction process. To ensure that the internal force and deformation of the bridge structure are always in a safe, controllable and reasonable range during the whole construction process, and that after the completion of the bridge, the internal force and alignment of the bridge structure meet the design requirements. The error with the ideal target value is the smallest. In this paper, based on the Yongchuan Yangtze River Bridge under construction, the construction control method of long-span hybrid beam cable-stayed bridge is studied: (1) Cable force-elevation control method. This paper briefly introduces the implementation process of the traditional cable force-elevation control method for cable-stayed bridges, and points out the limitations of the application of this method to the construction control of long-span hybrid beam cable-stayed bridges. 2 geometric control method. This paper briefly introduces the geometric control method, introduces the basic viewpoint and theoretical basis of the geometric control method, introduces the stress-free alignment of the main tower and the main beam element, and discusses in detail the calculation method of the stress-free alignment. Two theories of cable length calculation without stress are introduced in detail: parabola theory and accurate catenary theory, and how to use Midas Civil to calculate the construction control of geometric control method is described in detail. 3. Multi-objective control method for construction control of long-span hybrid beam cable-stayed bridge based on geometric control method. The multi-objective control method of construction control of long-span hybrid beam cable-stayed bridge based on geometric control method is discussed in detail. The stress-free geometric parameters of the structure are taken as the main control object, and the geometric parameters of the middle span steel main beam are taken as the basic control object. The length of cable without stress is taken as the main control method. The mechanical parameters of the side span concrete main beam are taken as the basic control goal, the stress free alignment of the main beam is taken as the main control method, and the cable length and cable force double control are taken as the whole process control method of stress control. Based on Yongchuan Yangtze River Bridge, the implementation process of multi-objective control method for construction control of long-span hybrid beam cable-stayed bridge based on geometric control method is introduced in detail, and the implementation results of construction monitoring are evaluated. Finally, two key problems encountered in construction monitoring (stiffness of side span concrete support, friction resistance of support seat and friction resistance of side span concrete support) are briefly discussed. The hybrid beam cable-stayed bridge has the advantages of beautiful appearance, good leapfrogging ability and strong terrain adaptability, and is more economical than the all-steel box girder cable-stayed bridge under the same span, and realizes the harmony and unity of "safety, economy, applicability and beauty". Under the background of the great development of bridges in our country, there is a wide range of application prospects. This paper has great reference value for the construction monitoring of long-span hybrid beam cable-stayed bridge in the future.
【學位授予單位】：重慶交通大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：U448.27

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