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.