Under a concentrated load, bearing stress f_{b} in a beam, is given by (where b is the length of the bearing plate and h is the depth of the root of the fillet).

If R is the reaction on the bearing plate, the minimum moment of. inertia of the bearing stiffener provided at the support of a plate girder of overall depth D, the maximum thickness of the compression flange T, carrying total load W, is

The economical depth d of a web plate in which allowable bearing stress is f_{b}, and the maximum bending moment is M, as suggested by Rawater and Clark, is