Girder crane beam

Girder crane beam by rigid top chord and overhead gantry crane chord, vertical and diagonal. General welding; Bent or welding rigid, with the vertical rod or CHS friction type high strength bolt connection is used. Suitable for large span and the corresponding small crane lifting weight, light or heavy duty in soft hook crane. Make more complex, the truss node is sensitive to fatigue, need large clearance, there is enough to satisfy the truss height; Crane rail directly laid on the first quarter, make the bridge gantry crane produces larger local bending moment. According to the simply-supported hinged truss and the crane is the most unfavorable position calculate the axial force of bar.