Gross flange area for a riveted plate girder is to be designed considering net area as 80% of its grossarea.
Consider width of the flange as 500 mm while web plate as 1000 mm x 12 mm. The girder is to resist a maxi-mum BM of 4500kNm.
Maximum allowable bending stress in tension is 150MPa.
Gross flange area is

22000 mm2
 
35500 mm2
 
46000 mm2
 
73000 mm2
 

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