飞燕式钢管混凝土拱桥..docVIP

摘要 钢管混凝土拱桥由于具有承载力高、塑性和韧性好、施工方便、经济效果好和地基适应性强等优点，是发展前景广阔的一种组合桥梁结构。目前钢管混凝土拱桥在我国已经历了十余年的发展，无论是其应用规模还是跨径增长的速度都是惊人的。相对而言我国建设钢管混凝士拱桥的技术已经达到国际先进水平，我国对钢管混凝十拱桥的理论研究也取得了很多成果。 本设计根据任务书要求设计一中承式钢管混凝土拱桥。中承式钢管混凝土拱桥美观且受力合理, 但该种桥型设计参数较多, 各参数相互关联, 给设计工作带来了困难。 首先进行初步设计，即拟定所选方案桥型的具体尺寸以及相关参数。主拱拱肋采用中承式抛物线无铰拱，主孔计算跨径100m，计算矢高25m，矢跨比1/4。最重要的是主拱肋的截面尺寸，都是根据规范和相关的参考资料来拟定。[8,9] 第二步就要进行结构计算，这其中最为关键的便是建模，最后的计算是否正确，在很大程度上取决于模型建得是否正确。本设计利用“迈达斯”软件计算，将建好的模型图导入软件，并将计算好的模型参数赋给模型结构单元。添加约束后模型就宣告建立完成，进入计算阶段。利用软件就可计算出结构各控制截面的内力。 完成上述工作后，便要进行结构验算，对于拱桥最重要的就是要验算拱圈截面承载力与拱圈的整体稳定性。 关键词：钢管混凝土拱桥；中承式；有推力；结构计算 Abstract Because of its merits of high carrying capacity ,upstanding plasticity and toughness, construction concenience ,better economic effect and better foundation adaptability, the concrete-filled steel tube(CFST) arch bridges is one of the bridge structures that have broad prospects for development .The development history of the concrete-filled steel tube arch bridge is more than ten years in our country, we are all surprised to its application range or increase in span .Opposite and speech our country build the arch bridge technique of the steel pipe concrete have already attained international advanced level, our country to the theory of the steel pipe concrete arch bridge the research also obtained an equal result. This design according to the specification requirements to design a half-through concrete arch bridge. Half-through concrete arch bridge, beautiful and stress is reasonable, but the bridge design parameters, the parameters are related to design work, brings difficulties. First ，starting preliminary design, namely the elaboration of the selected programs bridge the specific size and the relevant parameters. The Bridge arch-arch ribs for use in the parabola lines without hinge arch, the main hole calculation Span 100 m, calculated vector high 25 m, vector-than 1/4. Ultimately to the Arch Bridge is the main section size, are in accordance with the norms and relevant reference mater