【作者】 和兆建；

【导师】 刘山洪；

【作者基本信息】 重庆交通大学 ， 桥梁与隧道工程， 2011， 硕士

【摘要】 钢管混凝土桁架梁桥以其自重轻、施工方便、造价低以及受力性能好等优点越来越受到广大土木工程设计者的青睐。在我国,采用钢管混凝土桁架梁式体系的桥梁有广州南海紫洞大桥、湖北向家坝大桥以及重庆万州大桥,其均采用圆钢管混凝土。相对于圆形钢管,矩形钢管具有易于切割、节点构造简单、施工方便、与桥面板连接容易以及抗弯刚度大等优点。本文对已建成的钢管混凝土梁桥以及国内外学者对矩形钢管混凝土桁架研究的基础上构思了一种新型钢管混凝土桁架梁式桥。本文的主要研究工作围绕以下几方面展开:①对钢管混凝土结构尤其是矩形钢管混凝土结构的受力特点及已建成的钢管混凝土桥进行了介绍,提出了矩形钢管混凝土桁架在梁式桥梁上的应用潜力。②对钢桁梁桥的组成构造进行详细的分析,并对已建的钢管混凝土桁架梁式桥受力特点进行分析。③对矩形钢管混凝土桁架及节点的类型构造、计算模型的选取进行系统的分析,为矩形钢管混凝土桁架连续刚构桥的试设计提供了很好的理论基础。④以越溪河大桥为工程背景,试设计了同等跨径小偏心和大偏心矩形钢管混凝土桁架连续刚构桥,并对施工过程中和成桥状态下的极限承载力进行计算对比分析,得到矩形钢管混凝土桁架连续刚构桥的合理受力模式。⑤节点是桁架梁桥的关键受力部位,决定了桁架整体结构行为。试设计出一种适合矩形钢管混凝土桁架连续刚构桥的节点形式,并对其承载能力极限状态和节点的焊接强度进行验算。通过对试设计的矩形钢管混凝土桁架连续刚构桥进行受力分析、经济比较以及节点试设计可知:矩形钢管混凝土桁架连续刚构桥是一种受力合理、施工方便、具有良好经济性的桥梁结构形式。更多还原

【Abstract】 Concrete-filled steel tube truss bridge has more and more been relied by the majority civil engineering designers for its light weight, convenient construction, low cost and good mechanical properties. In China, Zidong Bridge in Nanhai of Guangzhou, Xiangjiaba Bridge in Hubei and Wanzhou Bridge in Chongqing are concrete-filled steel tube truss bridges which are used with concrete-filled steel tube. Comparing to the circular steel tube, rectangular steel tube has many advantages,such as easy to be cut, simple node structure, convenient construction, easy to be connected with the bridge deck and bending stiffness, etc. Base on the concrete-filled steel tube truss bridges which have been built and the domestic and foreign scholars’studies of the rectangular concrete-filled steel tube, this paper propose a new kind of concrete-filled steel tube truss bridge.In this paper, a research work mainly focus on the following aspects:①The mechanical characteristics of the concrete-filled steel tube structure, especially the rectangular concrete-filled steel tube structure, and have been built of the concrete-filled steel tube truss bridge are introduced, propose a rectangular concrete-filled steel tube truss bridge in the potential applications.②The structure of the steel truss bridge was introduced, the concrete-filled steel tube truss bridges was analyzed, which have been built.③The rectangular concrete-filled steel tube’s truss and nodes’type and selection of the calculate model are systematic analyzed, which provide a very good basic of trial design theory for the rectangular concrete-filled steel tube truss continuous rigid frame bridge.④Taking the Yuexi River bridge as the engineering background, try to design a kind of same span of small eccentric and large eccentric rectangular concrete-filled steel tube truss continuous rigid frame bridge, analyze the ultimate bearing capacity of construction process and in the bridge state, and get a reasonable force mode of the rectangular concrete-filled steel tube truss continuous rigid frame bridge.⑤Node is a key force part of the truss bridge, that determines stucture behavior of the overall truss.This paper try to design a suitable node of the rectangular concrete-filled steel tube truss continuous rigid frame bridge, and check its ultimate limit state and the node intensity of welding.Through the design of the rectangular concrete-filled steel tube truss continuous rigid frame bridge’s stress analysis, economic comparison and node design, we can see that the rectangular concrete-filled steel tube truss continuous rigid frame bridge is a feasible bridge program of reasonable force, convenient construction and a good economic bridge structure form.更多还原