1. Width of seat plate width of beam flange +2sw
   1. thickness of seat plate flange thickness of beam bearing length of seat plate $\frac{R}{tw\times\frac{fy}{ymo}}$
   2. Stiffner plate 1 thickness of stiffning plate $\lt$ tw(thickness of webb of beam) 2 . depth of stiffning plate d$\lt$18.9...IS pg 18 d$\lt$ 18.9t provide stiffning plate …