异形斜拉桥施工控制与力学行为研究

发布时间：2018-12-20 06:06

【摘要】：异形斜拉桥结构形式新颖,具有空间性、特殊性、复杂性的特点，受力状态与传统斜拉桥相比呈现出新的特点，因而结构分析及施工控制的重要性越来越突出，本文以咸阳沣河大型双肢异形塔斜拉桥为工程背景，对该桥的施工控制方法及力学行为进行分析研究。本文首先回顾了异形斜拉桥的研究现状和存在问题,接着对异形斜拉桥的施工控制进行探讨，找出其施工可能遇到的问题、施工中的难点及应该注意事项；并结合该异形斜拉桥的结构特点分析施工监控的方法，，确定施工监控的重点，探讨该施工控制理论的可行性。其次，分别运用刚性支承连续梁法和基于影响矩阵的弯曲能量最小法，确定该斜拉桥合理成桥状态的索力，并对两种方法进行分析比较；对于其合理施工状态，无应力状态法能方便地确定各施工阶段的初张索力，并且分析了拉索张拉过程中的结构效应以及拉索张拉过程中的风险控制等。运用有限元软件MIDAS CIVIL建立全桥三维仿真模型，选取力学参数进行敏感性分析,进行敏感性因素判断，找出关键影响因素，用于指导施工实践。最后，详细分析该异形斜拉桥在施工过程及成桥后的内力、应力及变形，找出该类型的斜拉桥在施工过程中的变化规律以及结构的受力特点，并进行总结，为异形斜拉桥施工控制的实施提供理论基础。
[Abstract]:The structure of special-shaped cable-stayed bridge has the characteristics of space, particularity and complexity. Compared with the traditional cable-stayed bridge, the structural analysis and construction control are more and more important. In this paper, the construction control method and mechanical behavior of this bridge are analyzed and studied based on the engineering background of a large two-legged cable-stayed bridge with special-shaped towers in Xianyang River. This paper first reviews the research status and existing problems of the special-shaped cable-stayed bridge, then discusses the construction control of the special-shaped cable-stayed bridge, finds out the possible problems encountered in the construction, the difficulties in construction and the matters to be paid attention to. Combined with the structural characteristics of the special-shaped cable-stayed bridge, the construction monitoring method is analyzed, the key points of construction monitoring are determined, and the feasibility of the construction control theory is discussed. Secondly, the rational cable force of the cable-stayed bridge is determined by the rigid support continuous beam method and the minimum bending energy method based on the influence matrix, and the two methods are analyzed and compared. For the reasonable construction state, the stress free state method can easily determine the initial tension force in each construction stage, and analyzes the structural effect in the process of cable tension and the risk control in the process of cable tension. The 3D simulation model of the whole bridge is established by using the finite element software MIDAS CIVIL. The sensitivity analysis is carried out by selecting the mechanical parameters and the key influencing factors are found out to guide the construction practice. Finally, the internal force, stress and deformation of the cable-stayed bridge are analyzed in detail during the construction process and after the completion of the bridge, and the variation law of the cable-stayed bridge in the construction process and the stress characteristics of the structure are found out, and summarized. It provides a theoretical basis for the implementation of construction control of special-shaped cable-stayed bridge.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U448.27

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