蝴蝶拱桥发展概况与设计参数分析  

Development and design parametric analysis of butterfly shape arch bridge

作　　者：罗慧苓 

机构地区：[1]福州理工学院,福建福州350506

出　　处：《福建建筑》2016年第1期91-94,共4页Fujian Architecture & Construction

摘　　要：蝴蝶拱桥是将竖直拱肋往桥外外倾而形成的一种新型异型拱桥。调查分析结构稳定性能已建成的蝴蝶拱桥设计参数,了解其结构受力与构造特点。结果表明,蝴蝶拱桥通常采用中下承式无推力拱的结构体系;适用跨径80-160m;矢跨比1/5-1/3,跨径增大时应增设副拱,副拱间设置连杆来保证结构稳定,同时钢箱是主要采用的截面型式;蝴蝶拱桥的面外刚度小于面内刚度,结构横向稳定性突出;拱肋外倾角取值范围13.5°-33.5°,为获得良好的稳定性能,拱肋倾角设计时可选择最佳倾角。The difference between butterfly shape arch and traditional arch is the outward incline of the arch rib. In the paper,the main design parameter of butterfly shape arch bridge is investigated and the stability of the structure is analyzed for studying the characteristic of the structure. The analysis results show the rational span is 80 m to 160 m of butterfly shape arch bridge and 1 /5 to 1 /3 of the span-rise ratio is appropriate. When the span is lengthened,the assistant arch must be set up to ensure the safe of the structure and the steel box section is adopted. The out-of-plane stiffness is small than in-plane stiffness and unstability mode of the main arch is out-of-plate mode.The inclined angle depends on the mechanical behaviors of structure and artistic requirements and the value of angle range from 13. 5 degree to 33. 5 degree. The optical inclined angle of main arch rib should be selected for good stability.

关 键 词：蝴蝶拱桥 矢跨比 副拱 外倾角 

分 类 号：U448.22[建筑科学—桥梁与隧道工程]