采用结合梁建造先缆后梁自锚式悬索桥的研究

Study on Self-anchored Suspension Bridge Construction with Cable Fitting First Followed by Composite Girder

自锚式悬索桥传统上采用先架梁、后挂缆的施工顺序,需设立大量的临时支架以支撑主梁,使该类桥式的应用推广受到了限制.针对100～500m中等跨度的自锚式悬索桥,文章提出一种先架缆、后挂梁的设计施工方案.并计算施工过程中墩顶必须承受的最大水平拉力以及钢纵梁的最大轴向压应力.结果表明,在一定跨度范围内,墩顶最大水平分力以及纵梁的压应力可以接受,故此法能够克服目前自锚悬索桥需设立临时支架的弊端.

Traditionally, self-anchored suspension bridge is constructed in the sequence of fitting gird first followed by erection of main cable.Many temporary supports would be required.So this kind of bridge is restricted.For middle span self-anchored suspension bridges ranged fi＇om 100m to 500m, a construction method of cable first followed by girder is brought up. The maximum horizontal force that the pier must resist and the longitudinal stress of the stringer are studied. The results show that the horizontal force of the pier and the stress of the stringer are acceptable for this type of bridge within a certain range of span, and this method can overcome the defect of constructing temporary supports.