下承式刚性吊杆三铰钢拱桥受力性能研究

发布时间：2018-04-22 16:20

本文选题：下承式 + 三铰钢拱桥　；参考：《长安大学》2014年硕士论文

【摘要】：随着我国桥梁建设水平的迅速发展，钢拱桥的应用越来越广泛。下承式刚性吊杆三铰钢拱桥因制造简单，施工方便等优点而被应用于桥梁建设中。本文主要研究了该类桥梁的静力性能、空间稳定性以及刚性吊杆的疲劳问题。主要完成了以下工作：首先以宁波市灵桥为研究对象，通过有限元计算分析，系统地研究了矢跨比、拱肋刚度、拱肋内倾角、吊杆刚度和边界条件对结构受力的影响；总结各设计参数对结构受力的影响规律，综合考虑结构受力、施工、造价等因素，提出该类桥梁的合理结构形式，即矢跨比1/5~1/7，平行拱，，竖直吊杆，拱肋刚度不宜过大，吊杆刚度不宜过小；灵桥结构静力分析结果满足规范要求，进一步验证了该类桥梁结构形式的合理性。然后研究了下承式刚性吊杆三铰钢拱桥的结构稳定性，以宁波市灵桥为研究对象，通过有限元计算分析，研究了矢跨比、拱肋刚度、拱肋内倾角、吊杆刚度、横向联结系对结构空间稳定性的影响；给出了改善其稳定性的一些建议，即矢跨比不宜太小，增大拱肋刚度可以在一定程度上改善结构稳定性，但拱肋刚度也不宜太大，可以通过增大吊杆和横向连结系刚度，或者布置较多的拱肋横向连结系来提高拱肋的横向稳定性。最后研究了刚性吊杆的疲劳问题，论述了老龄铆接钢桥的传统疲劳寿命评估方法；基于传统疲劳寿命评估方法，通过有限元软件对灵桥铆接钢吊杆进行了疲劳分析，计算了灵桥铆接钢吊杆的剩余疲劳寿命，并给出了一个抗疲劳设计建议。
[Abstract]:With the rapid development of bridge construction in China, steel arch bridge is more and more widely used. The through rigid suspension steel arch bridge is used in bridge construction because of its simple manufacture and convenient construction. In this paper, the static performance, spatial stability and fatigue of rigid suspenders are studied. The following tasks have been completed: Firstly, the effects of rise-span ratio, arch rib stiffness, inclination angle of arch rib, suspender stiffness and boundary condition on the stress of the structure are systematically studied by finite element analysis. This paper summarizes the influence of design parameters on the structure stress, synthetically considers the structural force, construction, cost and other factors, and puts forward the reasonable structural form of this kind of bridge, that is, 1 / 5 / 5 / 1 / 7 of rise-span ratio, parallel arch, vertical suspender, and arch stiffness should not be too large. The stiffness of suspension rod should not be too small, and the static analysis results of Lingqiao structure meet the requirements of the code, which further verifies the rationality of this kind of bridge structure. Then, the structural stability of the through rigid suspension three hinged steel arch bridge is studied. Taking Ningbo Lingqiao as the research object, the ratio of rise-span, the stiffness of arch rib, the inclination angle of arch rib and the stiffness of suspender are studied by finite element analysis. Some suggestions for improving the stability of the structure are given, that is, the rise-span ratio should not be too small, the stability of the structure can be improved to a certain extent by increasing the stiffness of the arch rib, but the stiffness of the arch rib should not be too large. The lateral stability of the arch rib can be improved by increasing the stiffness of the suspender and the transverse connection, or arranging more transverse connection of the arch rib. Finally, the fatigue problem of rigid suspension rod is studied, and the traditional fatigue life evaluation method of riveted steel bridge is discussed, based on the traditional fatigue life evaluation method, the fatigue analysis of riveted steel suspender of Lingqiao is carried out by finite element software. The residual fatigue life of riveted steel suspenders of Lingqiao is calculated, and a suggestion of anti-fatigue design is given.
【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】：U448.22;U441

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