A bridge girder AB on a simple span of length L = 14 m supports a distributed load of maximum intensity q at mid span and minimum intensity q/2 at supports A and B that includes the weight of the girder (see figure).
The girder is constructed of three plates welded to form the cross section shown.
Determine the maximum permissible load q based upon
(a) An allowable bending stress σallow = 110 MPa and
(b) An allowable shear stress Ï„allow = 50 MPa.

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450 mm 32 mm L=14m 16mm→ 1800 mm 32 mm 450 mm