钢管混凝土哑铃形截面拱桥应用与分析

Application and analysis of concrete-filled steel tubular arch bridge with arc rib of dumbbell-shaped cross section

为对钢管混凝土哑铃形截面拱桥的工程应用与研究提供参考,文中根据收集到的大量已建钢管混凝土哑铃形截面拱桥基础资料,介绍了哑铃形截面拱桥的发展概况、桥跨结构类型、拱肋截面受力特点和各类哑铃形拱桥常用施工方法,并对其结构与构造的主要参数,如拱轴线形、矢跨比、宽跨比、拱肋跨高比、拱肋截面高宽比、拱肋材料特性、横撑和吊杆布置等进行统计分析,提出了钢管混凝土哑铃形截面拱桥主要设计参数的取值范围。分析表明：大多数哑铃形拱桥的矢跨比f/L在0.2-0.25范围;矢跨比为0.2的桥梁最多,约占桥例总数50%;拱肋跨高比L/h主要分布在30-50范围,跨高比一般随跨径增大而增大;拱肋截面高宽比h/d与跨径关系很小,不同跨径区间哑铃形拱桥的高宽比都集中2.5左右,其中高宽比在2-3范围的桥梁占总数90%以上。

In order to provide a reference for application and research of concrete-filled steel tube（ CFST） arch bridges with arc rib of dumbbell-shaped cross section,the development,structure type and erection method of the arch bridges and the mechanical characteristics of arch rib cross section of the bridges were introduced according to collected information. Structure parameters of arch rib cross section,such as arch axis type,rise-span ratio,width-span ratio,span to section height ratio,height-width ratio,material properties,bracing and suspender arrangement,were statistically analyzed,. The value ranges of the main design parameters of the arch bridges were presented. It is shown that the rise-span ratio of most arch bridges with dumbbell shaped cross section is in the range of 0. 2 - 0. 25,and that nearly 50% of the bridges adopt 0. 2. Arch span to section height ratio ismainly distributed in the range of 30 - 50,which generally increases with arch span. The relationship between arch span and height-width ratio of cross section is very small,and the ratios are concentrated around 2. 5. More than 90% of height-width ratios are in the range of 2 - 3.