无背索斜拉拱桥桥型方案设计

结合广西梧州的人文、地理、经济、文化等方面的特色和城市桥梁对景观的要求,构思出造型独特、景观优美的无背索斜拉拱桥方案。该方案将一般斜拉拱桥的主塔改为倾斜,单面设置拉索,形成无背索斜拉-拱组合体系。详细介绍该桥型的结构构造,并为了解结构体系的受力特点,对该桥型进行空间有限元分析。结果表明,结构内力分配合理。另外,探讨了斜塔倾角的变化对主拱内力的影响,得到了主拱内力随倾角变化的分布规律,并通过分析得出,斜塔倾角为60°左右较为合适。

Design of Cable-stayed Arch Bridge without Backstays

Combining with the humane, geographic, economic, cultural characteristics and the landscape requirements of urban bridge in Guangxi Wuzhou, the unique shape and beautiful landscape scheme of cable-stayed arch bridge without backstays is conceived. In the scheme, the main pylon of the general cable-stayed bridge is changed into the inclined pylon and only one side with the cables to form the combination system of cable-stayed arch bridge without backstays. The article introduces the structural construction of this bridge type in detail, and analyzes the spatial finite element of bridge type in order to understand the stress characteristic of structural system. The results show that the structural internal force is reasonably distributed. In addition, the article discusses the influence of the dip angle variation of inclined pylon on the internal force of the main arch, and gives the distribution rule of the internal force of the main arch with the variation of dip angle. The analysis shows that the suitable dip angle of inclined pylon is about 600.