钢筋混凝土下承式系杆拱桥设计与施工

Design and Construction of Steel Reinforced Concrete-Throug Bowstring Arch Bridge

贵州省开阳县东山大桥为一跨90m钢筋混凝土下承式系杆拱桥,净跨88m。拱肋矢跨比为1/5,其轴线为二次抛物线,为钢筋混凝土结构,系梁断面为矩形截面。截面内共设6束21φ~j15．2mm低松驰预应力钢绞线。每片拱肋有14根吊杆,每根吊杆采用φ7-73预应力钢丝束组成,并锚于拱肋和系梁上。结构计算分析在平面力系下进行,采用“桥梁平面杆系结构计算软件”对上部结构进行计算分析。

Dongshan Bridge in Kaiyang County of Guizhou Province is one-span 90-m steel rein- forced concrete-through bowstring arch bridge.Its net span is 88m.The rise-span ratio of the arch rib is 1/5.Its axis is the secondary,parabola.It is the steel reinforced concrete structure.The bowstring beam section is rectangle section.There are 6 bundles of 21Φj15.2mm low loose pre-stressed steel strand cable in the section.Each piece of arch rib has 14 booms.Each boom is composed of 7-73 pre-stressed steel cables,and is anchored on the arc rib and bowstring.The cal- culation and analysis of structure is carried out under the plane bearing system.The“bridge plane bowstring structure calculating software”is used to calculate and analyze the superstructure.