Abstract: It introduces the design of a special crane bridge. Aiming at the problems with the crane bridges being put outside at high altitudes, having a large gyration radius, and suffering from big wind impact and heavy vibration, it presents the design of the bridge structure consisting of one main truss and four attached trusses with the crosssection like a set triangular and the trusses being welded by circular steel. A mechanical analysis and repeated experiments were done to raise the stiffness of the bridge, to lower the gravity center and to reduce the area covered by the wind of the bridge so as to make the vibration smaller so that it works smoothly with high safety performance.

Key words: crane; bridge frame; truss; stiffness; antivibration