中山一桥桥面系的方案选择

Plan Selection Concerning Bridge Floor System of Zhongshan No.1 Bridge

桥面系的方案选择是关系到整座桥的造价以及受力性能的重要因素,广州市中山一桥在进行桥面设计时采用了两个方案,一个是钢-混凝土结合梁体系,另一个是钢箱体系。通过对两种方案的截面几何尺寸、构件内力、挠度和变形曲线、自振周期和振型这几个方面的分析比较,得到它们之间的受力性能异同,结合中山一桥的具体特点和这两种方案下受力性能间的分析比较,最终选定桥面系的方案为钢箱体系。这种体系具有桥面系轻,各主要构件的内力小,桥面的挠度值小,施工速度快的特点,尤其适合于要求施工工期短的城市桥梁,将钢箱体系应用于中山一桥中取得了很好的综合经济效益。通过对中山一桥桥面系方案选择的探讨,旨在为类似桥梁桥面系方案的选择提供参考。

Plan selection concerning bridge floor system is an important factor that affects cost and behavior of a bridge.Two plans concerning bridge floor system of Zhongshan No. lbridge in Guangzhou are used, one of that is steel-concrete composite beam system, and the other one is steel-box system.Section sizes, internal forces of members, displacements and defomation curves, nattral vibration periods and modes coneeming the two plans are compared, thus differences and common points of behaviors are obtained, moreover, Zhongshan No.1 bridge is in busy urban area, so at last steel-hox system is chosen in view of comparison of behaviors and specialties of the bridge. The conclusion is achieved that steel-hox system has lighter bridge floor system smaller internal forces of primary members, smaller displacement and shorter coustruction period than steel-conerete composite beam system, and steel-hox system is especially fit for urban bridges, that must be finished in short time.Stecl-hox system is applied in Zhongshan No. 1bridge with good economic benefits. References and suggestions are provided concerning plan selection of bridge floor system of similar bridges, based on discussion eoneeming plan selection of bridge floor system of Zhongshan No. lbridge.