三片拱肋钢管混凝土系杆拱桥设计关键技术探讨

Study of Key Techniques for Design of Concrete-Filled Steel Tubular Tied Arch Bridge with Three Arch Ribs

上海市青浦区山周公路淀浦河大桥主桥为70m钢管混凝土系杆拱桥,横向布置三片拱肋。论述了在确定边、中拱肋截面尺寸及选择施工方法时,需要考虑的因素及与两片拱肋拱桥的不同之处。针对钢管混凝土拱肋横向加劲的布置原则和构造设计、拱肋与钢筋混凝土拱座的连接构造等关键技术也进行了初步探讨。

The main bridge of the Dianpu River Bridge on Shanzhou Road in QingPu District of Shanghai,is a 70 m concrete-filled steel tube tied arch bridge with three arch ribs in transverse section.This paper discusses the influencing factor and difference comparing with a two-arch bridge about defining sectional dimension of side and middle arch rib,and construction technology.The key techniques for design of this type bridge are also preliminarily studied,such as layout principle and structure design of transversal stiffening to concrete-filled steel tubular arch rib,connection method between arch rib and reinforced concrete arch seat.