西关大街跨火烧沟m三跨连续梁桥上部结构设计.doc

兰州交通大学毕业设计（论文） PAGE PAGE I 摘 要 本设计为西关大街跨火烧沟（21+35+21m）连续梁桥的上部结构设计。道路为城市次干路，设计荷载为城市A级。在设计过程中，首先根据地质、水文等情况拟定了三个方案，经过比选后选择了方案二进行设计；然后拟定桥梁的纵横截面，并用MIDAS软件分析计算了控制截面的恒载内力与活载内力，且用两种方法计算了横向分布系数；接着按照承载能力极限状态和正常使用极限状态进行效应组合，画出内力包络图；再然后根据组合结果配置预应力钢筋；最后，对控制截面进行承载能力极限状态验算、正常使用极限状态验算、应力和变形验算。经验算，本设计满足规范要求。 本设计拟定的施工方式为满堂支架法现浇施工，此施工方式简单、可靠、成熟，施工工期短，施工成本低。 关键词：预应力混凝土，满堂支架，横向分布系数，箱梁 PAGE PAGE II Abstract The design is the design of the superstructure of the Xiguan Street Cross Huo Shao ditch(21+35+21m) continuous beam bridge. The road grade is the City Secondary road, the design load is City-A class.In the design process, first I proposed three schemes according to the geological, hydrological conditions, and I’m sure take the second schemes to design after comparing. Then I proposed the cross section and the longitudinal section for bridge, using the MIDAS Civil to calculate the constant load internal force and live load force, and the transverse distribution coefficient was calculated by two methods. Then conducting combination of load effects depend on the ultimate limit state of bearing capacity and the ultimate limit state of normal usage, drawing the envelope diagram of internal force.Then according to the results of prestressed reinforcement combination configuration. Finally, having check of the ultimate limit state of bearing capacity and the ultimate limit state of normal usage, stress and deformation checking.The design meet the requirements of specification depend on checking. This design adopts the way of full framing construction. The construction method is simple, reliable and mature,have short construction period,the low cost of construction. Keywords:Prestressed concrete, Full framing construction, Transverse distribution coefficient, Box girder. PAGE PAGE I 目 录 TOC \o 1-2 \h \u 14371 摘 要 I 20999 Abstract II 15692 一、 绪论 3 27678 （一） 桥梁概述 3 31608 （二） 箱梁 3 28904 二、 设计基本资料 5 337 （一） 水文地质资料 5 11354 （二） 主要技术标准