Design of Superstructure of Main Bridge of Xiangshan Bridge in Zhongshan
The main bridge of Xiangshan Bridge in Zhongshan is a cable-stayed bridge with a main span of 880 m,two side spans of 312 m and two end spans of 136 m.Accommodating two levels of vehicle traffic,the superstructure consists of N-shaped steel trusses that measure 42.2 m wide and 2.8 m deep(typical truss segments),in which the upper and lower chords and web members are all of box cross-section with stiffeners,and the floorbeams are fish-belly shaped beams.A 187.2 m-long zone of each side span is placed with concrete deck panels which also serve as counterweight,the remaining zones are installed with orthotropic steel plates.The longitudinal steel-concrete joint section in the lower deck is located at the fourth segment counted from the auxiliary piers towards midspan,51.2 m to auxiliary piers),fitted with bearing plates,supporting stiffeners,prestressing tendons,shear studs and PBL connectors.The transverse steel-concrete joint section is located between the steel plates and concrete panels edging the traffic lanes on the lower deck(2.2 m to the lower chords),fitted with shear studs,PBL connectors and 1.3 m-wide cast-in-situ UHPC section.The pylons are concrete structure resembling the Chinese character"人",supported by bored piles.The stay cables are composed of high-strength Zn-Al alloy coated parallel steel wires of 7 mm diameter.Longitudinal dampers are installed between the pylon and the superstructure to form a semi-floating system.The load bearing behavior of the overall bridge and loading condition of local deck panels were numerically simulated.As per the analysis,the load bearing behavior of the structure meets the code requirements.The superstructure was divided into 25.6 m-long truss segments to facilitate hoisting.Apart from the upper flange of the chords and deck panels,the remaining components are all bolt-connected.
cable-stayed bridgehighway bridgesteel truss accommodating two levels of decksorthotropic steel decksteel-concrete joint sectionall-welded nodestructural design
万方数据
维普
