大跨中承式钢管混凝土拱桥桥道系合理位置分析

从功能和构造要求及美学的角度系统地论述大跨中承式钢管混凝土拱桥的桥道系相对位置的设置方法,探讨桥道系相对位置对桥梁结构的稳定与振动的影响,并对部分大跨中承式钢管混凝土拱桥的桥道系相对位置进行统计分析。研究表明:将衡量桥道系相对位置的参数c(桥道系距拱顶的高度与矢高的比值)设在0 6左右为合理位置,可使桥梁结构具有较好的横向稳定性和动力性能,并具有较强的美感。

Analysis of the Best Bridge Deck's Relative Position for Long-span Half-through CFST Arch Bridge

From the view of function,construction demand and aesthetic effect,the method to design the bridge deck system's position was systematically discussed for the longspan halfthrough concrete filled steel tubular arch bridge.The influence on the structural stability and vibration caused by various bridge deck system's positions were analyzed.The data of the bridge deck system's positions of some longspan halfthrough CFST arch bridges were collected and analyze by statistics method.It indicates that the best position of a bridge deck system can be confirmed when c,the parameter of a bridge deck system's position (ratio of the distance between deck and crown to rise),approximates 0.6.If so,the bridge construction will possess better lateral stability and dynamic performance,with more pleasant impression.