Design of Gantry Girders

Gantry girders support a travelling bridge girder provided with crane and a control cabin. They are commonly used in factories for moving heavy loads within the factory. * The following imposed loads should be considered in the design: 1. Vertical load from crane. 2. Impact load from crane. 3. Longitudinal horizontal force along the crane rail. 4. Lateral thrust across the crane rail. * Position of crane hook for maximum shear on gantry girder should be considered. * On gantry girder the position of crane girder for maximum shear and bending moment should be considered. * The ideal profile for gantry girder is a I-section strengthened with a channel section on compression flange. If necessary additional flange plates also may be used.