自锚式悬索桥主缆锚固结构受力性能研究

发布时间：2018-06-09 12:44

本文选题：自锚式悬索桥 + 主缆锚固区　；参考：《沈阳建筑大学》2014年硕士论文

【摘要】：近些年来,自锚式悬索桥越来越受到人们的关注,因其外型美观、经济、适应性强等特点,在国内外,已成功的建造了大量的自锚式悬索桥。自锚式悬索桥最大的特点是将主缆固定在加劲梁上,因此不需要修建大体积的锚定,不受地形条件影响,且外形美观。对于大跨度的自锚式悬索桥,主缆拉力比较大,加劲梁不仅要承受较大的弯矩,还要承受主缆较大的轴力,导致主缆锚固区结构的复杂性。主缆力通过锚固区将荷载传递到整个加劲梁上,锚固区的应力分布复杂,因此,国内外的学者开始对各种锚固区的结构形式进行研究,尝试着总结各种类型的锚固结构的受力特点及应力分布规律,为今后在设计中提供有力的参考价值。主缆的锚固结构是自锚式悬索桥设计的关键部位,也是设计的难点,在施工方面也是关键步骤。主缆力是通过锚固结构传递到整个加劲梁上,这样就使得锚固区的受力比较复杂,因对此研究的相关文献甚少,所以,人们也越来越关注自锚式悬索桥主缆锚固区的受力特性。从已有的文献中可以看出,现阶段主要是利用模型试验和有限元的分析方法进行锚固区的研究,两种方法相互对比,综合分析得到更符合实际的结果。现代有限元的不断进步,使得有限元理论计算的准确性很高,许多学者的研究结果也表明有限元计算和试验的结果很吻合。本文主要是运用有限元分析方法对沈阳浑河景观桥主缆锚固区结构进行详细的理论分析。首先,介绍了自锚式悬索桥的历史发展,结构构造特点,主缆锚固区的研究现状及发展趋势,并举出国内学者的研究成果。其次,介绍了自锚式悬索桥锚固结构型式,主要包括主缆与钢加劲梁的锚固结构、主缆与钢-混组合加劲梁的锚固结构和主缆与混凝土加劲梁的锚固结构三大类,并详细地介绍了各类型的构造和特点,比较出各类型的优缺点和适用条件。最后,介绍了有限元的基本理论,利用有限元软件MIDAS/FEA建立浑河景观桥主缆锚固区节段的实桥模型,并对其进行详尽的空间线性有限元分析,考察锚固结构在索力作用下的变形及应力分布情况。为能进一步的考察主缆锚固结构的受力情况,运用有限元软件MIDAS/FEA对锚箱结构进行了非线性分析,考察锚固结构的极限承载能力,并对分析中出现的应力集中现象进行优化处理。通过计算分析,浑河景观桥锚固区的受力性能良好,满足设计要求,安全储备较高。希望通过本文的研究能为今后类似桥梁的设计提供参考价值。
[Abstract]:In recent years, self-anchored suspension bridge has attracted more and more attention. Because of its beautiful appearance, economy and strong adaptability, a large number of self-anchored suspension bridges have been successfully built at home and abroad. The biggest characteristic of self-anchored suspension bridge is that the main cable is fixed on the stiffened beam, so it is not necessary to build mass anchoring, which is not affected by the terrain conditions, and the shape is beautiful. For the long-span self-anchored suspension bridge, the main cable tension is relatively large, and the stiffening beam must bear not only larger bending moment, but also the larger axial force of the main cable, which leads to the complexity of the structure of the main cable anchoring zone. The load of the main cable is transferred to the whole stiffened beam through the Anchorage zone, and the stress distribution in the Anchorage zone is complex. Therefore, scholars at home and abroad have begun to study the structural forms of various anchoring zones. This paper attempts to summarize the stress characteristics and stress distribution of various types of Anchorage structures, which provides a useful reference for the design of Anchorage structures in the future. The anchoring structure of the main cable is the key part of the design of the self-anchored suspension bridge and the difficulty of the design, and also the key step in the construction. The force of the main cable is transmitted to the whole stiffened beam through the Anchorage structure, which makes the force of the anchoring area more complicated. Because there are few related documents on this research, people pay more and more attention to the mechanical characteristics of the anchoring area of the main cable of the self-anchored suspension bridge. It can be seen from the existing literature that at present the Anchorage zone is mainly studied by using the model test and finite element analysis method. The two methods are compared with each other and the comprehensive analysis results are more in line with the actual results. With the development of modern finite element theory, the accuracy of finite element theory is very high. Many scholars' research results also show that the results of finite element calculation and experiment are in good agreement. In this paper, the finite element analysis method is used to analyze the Anchorage zone structure of the main cable of the Hunhe River Bridge in Shenyang. Firstly, the paper introduces the historical development, structural characteristics of self-anchored suspension bridge, the research status and development trend of main cable anchoring area, and points out the research results of domestic scholars. Secondly, the anchoring structure types of self-anchored suspension bridge are introduced, including the anchoring structure of main cable and steel stiffening beam, the anchoring structure of main cable and steel-mixed stiffening beam and the anchoring structure of main cable and concrete stiffening beam. The structure and characteristics of each type are introduced in detail, and the advantages and disadvantages and applicable conditions of each type are compared. Finally, the basic theory of finite element is introduced, and the real bridge model of the main cable Anchorage section of Hunhe landscape bridge is established by using the finite element software MIDAS-FEA, and the spatial linear finite element analysis is carried out in detail. The deformation and stress distribution of Anchorage structure under cable force were investigated. In order to further investigate the stress of the main cable Anchorage structure, the finite element software Midas / FEA is used to carry out nonlinear analysis of the anchor box structure, the ultimate bearing capacity of the anchor structure is investigated, and the stress concentration phenomenon in the analysis is optimized. Through calculation and analysis, the Anchorage area of Hunhe landscape bridge has good mechanical performance, satisfying design requirements and high safety reserve. It is hoped that the research in this paper can provide reference value for the design of similar bridges in the future.
【学位授予单位】：沈阳建筑大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U441;U448.25

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