ABSTRACT
Qingshan Yangtze River Bridge is a cable-stayed bridge with a main span of 938m, which is the fifth largest cable-stayed bridge in the world. In order to cope with challenges such as long span, wide bridge deck and heavy load, the girder of the main span of cable-stayed bridge adopts integral steel box-girder, while the main girder of the side span adopts composite structure composed by integral steel box and concrete bridge deck. The interface of the two types of structure is located near the bridge tower and extended into the middle span with a length of 18m. The main girder is 4.5m in height and 48m in width. The main tower is a concrete structure with shape of letter “A” and a height of 279.5m. The stay cable is arranged in a fan shape along the tower column. The section length between the stay cable at the girder is 15m. The main girder section near the tower is supported by a 0# cable instead of supporting by a lower beam and this design gave the bridge an optimum architectural effect. The foundation of the main tower adopts rotary bored concrete pile and the cable-stayed bridge adopts a fully floating structure system, a restraint system of viscous damper + limit block is adopted in longitudinal direction, and a system of separating c-section steel damper with shear clip tenon + vibration reduction and wind resistance support are adopted as horizontal restraint.
