混凝土自锚式悬索桥合理成桥状态及体系转换研究

发布时间：2019-03-15 11:48

【摘要】：自锚式悬索桥因其美观的外形、良好的受力形态和不受地质条件约束的优势,越来越受到工程界的重视,然而其特殊的合理成桥状态计算方法和施工顺序使得如何确定自锚式悬索桥合理成桥状态和体系转换方案一直是此类桥型的研究重点和难点。本文旨在获得一种既满足精确度要求又可避免繁复的有限元非线性计算的自锚式悬索桥合理成桥状态计算方法,总结确定自锚式悬索桥体系转换方案的方法和步骤,并确定算例桥梁的体系转换方案。本文首先引述了悬索桥已有的主缆线形计算理论:抛物线法、分段悬链线法和节线法,根据算法编写了相应计算程序,并通过算例比较各理论的计算结果误差。其次,将基于影响矩阵的合理成桥状态计算方法进行改良并创新应用于自锚式悬索桥,随后依托南京小龙湾桥为实际工程背景,验证该计算方法的适用性和精确性。最后研究了自锚式悬索桥的体系转换,并以小龙湾桥为例,详细叙述了吊索张拉方案的确定方法,提出了可行的张拉方案并根据各方案的优缺点和现场条件选择最优方案应用于实际施工。研究结果表明:悬索桥主缆线形的分段悬链线法为最精确解法,因此下文选定相应的计算程序计算合理成桥状态;基于影响矩阵的自锚式悬索桥合理成桥状态计算方法具备较高的适用性和精确性;确定的吊索张拉方案有效,使算例桥梁顺利转换到合理成桥状态。至此,对于类似算例的自锚式悬索桥的主缆线形、合理成桥状态以及体系转换方案,本文得到了一套成熟的计算流程,并突破常规,获得了新的合理成桥状态计算方法。确定的吊索张拉方式为类似桥型提供了工程借鉴。
[Abstract]:The self-anchored suspension bridge has been paid more and more attention by the engineering field because of its beautiful appearance, good force shape and advantages not constrained by geological conditions. However, its special and reasonable completion state calculation method and construction sequence make how to determine the reasonable completion state and system transition scheme of self-anchored suspension bridge has always been the focus and difficulty of this kind of bridge type research. The aim of this paper is to obtain a reasonable state calculation method of self-anchored suspension bridge, which can meet the requirement of accuracy and avoid the complexity of nonlinear finite element calculation, and summarize the methods and steps to determine the conversion scheme of self-anchored suspension bridge system. At the same time, the system conversion scheme of the bridge is determined. In this paper, the existing main cable alignment calculation theory of suspension bridge is quoted: parabola method, piecewise catenary method and node method. The corresponding calculation program is compiled according to the algorithm, and the error of calculation results of each theory is compared by an example. Secondly, the reasonable completed bridge state calculation method based on influence matrix is improved and innovatively applied to self-anchored suspension bridge. Then, the applicability and accuracy of the calculation method are verified based on the actual engineering background of Nanjing Xiaolong Bay Bridge. Finally, the system transformation of self-anchored suspension bridge is studied. Taking Xiaolong Bay Bridge as an example, the determination method of cable tension scheme is described in detail. The feasible tensioning scheme is put forward and the optimal scheme is selected according to the advantages and disadvantages of each scheme and the field conditions. The results show that the piecewise catenary method is the most accurate method for calculating the main cable shape of suspension bridge, so the corresponding calculation program is selected below to calculate the reasonable completion state of the bridge. The reasonable completion state calculation method of self-anchored suspension bridge based on the influence matrix has high applicability and accuracy, and the determined suspension cable tension scheme is effective, which makes the example bridge transfer to the reasonable completed bridge state smoothly. So far, for the main cable shape, reasonable completed state and system transition scheme of self-anchored suspension bridge with similar examples, a set of mature calculation flow has been obtained in this paper, and a new reasonable calculation method for the completed bridge state has been obtained by breaking through the conventional method of calculating the main cable shape, the reasonable completion state and the system transition scheme of the self-anchored suspension bridge. The method of cable tension can be used as a reference for similar bridge type.
【学位授予单位】：南京理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U448.25

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