钢管混凝土拱梁组合体系桥系杆与拱刚度值确定的研究

发布时间：2018-10-15 06:38

【摘要】：随着科学技术的发展，生产力水平空前提高，系杆拱桥在中国得到了极好的发展。系杆拱桥是一种独特形式的拱桥，作为拱桥形式中的一种的他不但具备拱桥的基本特征，而且自身的独特性质也是非常明显的。总的来说系杆拱桥是综合着拱与梁的优点的一种特殊桥型，他不仅仅只是将两种结构简单的耦合在一起，而是使得两种结构共同承担荷载与力，充分利用拱受压、梁受弯的受力特性，并由吊杆承受系杆的重力与荷载并传递至拱肋，而系杆对拱肋的拉力与拱的推力也相互抵消，形成一种超静定结构。这种拱桥外部为静定体系，内部则为一种超静定体系，因此对墩台不均匀沉降无影响。系杆拱桥从结构受力来说可以分为有推力体系和无推力体系两种。在系杆拱桥的施工过程中系杆刚度对组合体系的影响，系杆里预应力以及系杆本身受力对拱的影响，一直是一个值得深入探讨的问题，因此比较系杆刚度和拱刚度变化确定合理刚度值是非常值得研究的课题。本文以海南省琼海九曲江大桥工程为背景，，对大跨径钢管混凝土系杆拱桥进行研究，主要内容如下： ①结合九曲江大桥工程实例，通过对系杆拱桥模型的建立过程进行了介绍，并对几个关键的边界条件处理以及施工阶段的划分做了详细分析和研究，为今后的系杆拱桥有限元模型建立提供参考。 ②通过建模计算模拟不同系杆刚度以及拱刚度下组合体系的受力，并对系杆、拱刚度进行优化得出最优刚度，研究不同系杆预应力对组合体系的影响优化系杆预应力得出最佳受力状态下的预应力值。 ③通过改变单一变量与放大系数的方法，研究探讨合理的梁、拱刚度比，提出系杆拱桥不同拱梁截面横向刚度比、竖向刚度比、不同截面参数、不同材料参数对结构动力特性的影响，最后通过计算比较得出相应参数位移内力的最佳范围。
[Abstract]:With the development of science and technology, the level of productivity has been improved unprecedentedly, and the tied arch bridge has got excellent development in China. Tied arch bridge is a unique form of arch bridge. As one of the arch bridge forms, it not only has the basic characteristics of the arch bridge, but also its own unique properties are very obvious. In general, tied arch bridge is a special type of bridge which combines the advantages of arch and beam. It is not only the simple coupling of the two structures, but also makes the two structures bear the load and force together and make full use of the arch under pressure. The bending behavior of the beam is subjected to the gravity and load of the tie bar and transferred to the arch rib, and the tension of the tie bar to the arch rib and the thrust of the arch are offset each other to form a statically indeterminate structure. This kind of arch bridge is a statically indeterminate system outside and a statically indeterminate system inside, so it has no effect on uneven settlement of pier and abutment. Tie arch bridge can be divided into two types: thrust system and non-thrust system. In the construction process of tied arch bridge, the influence of the stiffness of tie bar on the composite system, the influence of the prestress in the tie bar and the force of the tie bar itself on the arch is always a problem worthy of further discussion. Therefore, it is worth studying to compare the stiffness of tie bar with the change of arch stiffness to determine the reasonable stiffness value. Based on the Qionghai Jiuqu River Bridge Project in Hainan Province, this paper studies the long-span concrete-filled steel tube tied arch bridge. The main contents are as follows: 1 combined with the Jiuqu River Bridge engineering example, This paper introduces the process of establishing the model of tied arch bridge, and makes a detailed analysis and research on several key boundary conditions and the division of construction stage. It provides a reference for the establishment of finite element model of tied arch bridge in the future. 2. By modeling and calculating, the forces of the combined system under different tie member stiffness and arch stiffness are simulated, and the optimum stiffness is obtained by optimizing the tie bar and arch stiffness. The influence of different tie bar prestress on the composite system is studied. The prestress value under the optimum stress state is obtained by optimizing the tie bar prestress. 3 by changing the method of single variable and magnifying factor, the reasonable ratio of beam and arch stiffness is studied and discussed. The effects of different cross-section stiffness ratio vertical stiffness ratio different cross-section parameters and different material parameters on the dynamic characteristics of the structure of tied arch bridge are presented. Finally the optimum range of displacement internal forces of the corresponding parameters is obtained by calculation and comparison.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U448.225

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