A W21x57 floor beam supports a 5-inch-thick reinforced concrete slab with an effective width b of 75 inches. Sufficient shear connectors are provided to make the beam fully-composite. The concrete strength is 4000 psi. Calculate the moment of inertia of the transformed section. If the beam in Problem 19 supports a positive service load moment o 300k-ft, calculate the maximum stress. A W200 x 100 A36 steel has a length of 12 meters and fixed ends. Note: Use theoretical k value. Section W200x100 Area (mm) 12,700 Ix (106 mm) 113 . Calculate the flexural buckling stress. Calculate the flexural buckling strength (LRFD). Iy (106 mm) 36.6