拉吊协作桥的施工控制与吊索疲劳控制研究

斜拉－悬吊协作体系具有结构新颖、美观、受力合理、抗风性能好，施工安全和介低的优点，在软土地基、强风地区尤能突出其优越性，在超大跨桥型中极具有竞争力，但是，由于斜拉与悬吊两部分结构的施工方法和受力机理有差异，使得结构在施工阶段的控制问题和运营阶段吊索的疲劳问题成为推广应用该桥型的主要障碍，据此结合协作的施工方法，先定成桥合理状态，再分别确定斜拉和悬吊部分的施工状态，实现其施工控制；采用改变结构体系等

Study of Construction Control and Suspender Fatiger Problems for Cable-stayed-suspension Bridges

Cable-stayed-suspension bridge is very suitable for the natural condition such as soft soil foundation and violent typhoon. It will become the most competitive bridge type in the super-long-span bridge system. But owing to the differences of construction method and under load behavior between cable-stayed and suspension, cable-stayed-suspension bridge will be faced with some problems such as construction control and fatigue problems of suspender under live loads. In this paper, according to the construction method of cable-stayed-suspension bridges, some methods to solve the problems are provided.