A welded steel girder having the cross section shown in the figure is fabricated of two 20in x 1 in. flange plates and a 60in x 5/16in. web plate.
The plates are joined by four longitudinal fillet welds that run continuously throughout the length of the girder.
If the girder is subjected to a shear force of 280 kips, what force F (per inch of length of weld) must be resisted by each weld?

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l in. 0 60 in. in. 16 in. 20 in