本文關鍵詞：龍灣大橋成橋索力優(yōu)化與合理施工狀態(tài)研究　出處：《華南理工大學》2014年碩士論文　論文類型：學位論文

  更多相關文章： 斜拉橋 索力優(yōu)化 最小能量法 影響矩陣法 合理施工狀態(tài) 自振特性

【摘要】：斜拉橋是一種高次超靜定的復雜結構，斜拉索索力對結構體系的內力分布有很大的影響，對控制全橋受力至關重要。如何進行成橋索力優(yōu)化以改善斜拉橋受力，如何通過施工達到合理成橋狀態(tài)，業(yè)已成為斜拉橋設計和施工技術中最引人關注的問題之一。 本文以佛山市龍灣大橋為工程背景，采用綜合最小能量法、影響矩陣法以及二次規(guī)劃理論的有約束最小能量法來確定其合理成橋索力。以主梁和主塔的彎曲應變能與拉壓應變能之和最小為目標函數，添加指定節(jié)點位移、控制截面彎矩以及索力上下限值為約束條件，通過二次規(guī)劃方法對成橋索力進行調整，利用Matlab優(yōu)化工具箱進行求解，最終得到合理成橋索力。 通過建立龍灣大橋施工階段模型，根據該橋牽索掛籃特點計算施工索力，并在成橋后運用影響矩陣法對索力進行調整，使其達到合理成橋狀態(tài)。本文采用單索施工，相較原雙索施工方案，所需施工索力減小，且施工過程更容易實現。最后，對龍灣大橋運營階段的靜動力行為進行分析，，計算了運營階段結構的受力與變形，并得到結構自振特性，驗證了此類型斜拉橋的自振特點，同時分別探討了結構剛度和邊界條件對龍灣大橋自振頻率的敏感性，得到一些有益結論。
[Abstract]:Cable-stayed bridge is a kind of complex structure with high degree of statically indeterminate. The cable-stayed cable force has a great influence on the internal force distribution of the structure system and is very important to control the whole bridge force. How to optimize the cable force of the bridge to improve the cable-stayed bridge force. How to reach a reasonable bridge state through construction has become one of the most interesting problems in the design and construction technology of cable-stayed bridges. Based on the engineering background of Longwan Bridge in Foshan City, the comprehensive minimum energy method is adopted in this paper. The constrained minimum energy method, which affects the matrix method and the quadratic programming theory, is used to determine the rational cable force of the bridge. Taking the minimum sum of the bending strain energy and the tension and compression strain energy of the main beam and tower as the objective function, the specified node displacement is added. Controlling the cross section bending moment and the upper and lower limit of cable force is the constraint condition. The cable force of the bridge is adjusted by quadratic programming method and solved by Matlab optimization toolbox. Finally, the reasonable cable force is obtained. Through the establishment of Longwan Bridge construction stage model, according to the characteristics of the bridge cable hanging basket calculation of the construction cable force, and after the completion of the bridge using the influence matrix method to adjust the cable force. This paper uses single cable construction, compared with the original two-cable construction scheme, the required construction cable force is reduced, and the construction process is easier to achieve. The static and dynamic behavior of Longwan Bridge in operation phase is analyzed, the stress and deformation of the structure in operation stage are calculated, and the natural vibration characteristics of the structure are obtained, which verifies the natural vibration characteristics of this type of cable-stayed bridge. At the same time, the sensitivity of structural stiffness and boundary conditions to the natural vibration frequency of Longwan Bridge is discussed, and some useful conclusions are obtained.
【學位授予單位】：華南理工大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：U448.27

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