Long Span Three-Pylon Cable Stayed Bridge for High Speed Railway, Conception and Analyses of PC Box Girder Stiffened by Steel Truss

摘要

Combination of PC box girder and steel truss is efficient to increase the global stiffness of the bridge and improve carrying capacity of the structure, and the PC girder has relatively large transversal stiffness to improve the global stability of the bridge. The composite girder can take the advantage of cable stayed bridge and can be erected in different phases; the steel truss can be installed after the enclosing of the PC girder and the force of the steel truss members can be adjusted reasonably by adjusting cable force. The composite girder is a good solution of long span railway bridge, which solves the problem that cable-stayed bridge as a flexible structure, especially those with three pylons, and meets the requirement of structural stiffness, forcing and large span requirement.