Problem 6.5 Knowing that the bending moment in the rein- forced concrete beam show is +150 kip-ft and the modulus of elasticity is Econc=3.75 x 106 psi for the concrete and E = 30 x 106 psi for the steel, determine (a) the stress in the steel, (b) the maximum stress in the concrete. st 1-in. diameter 30 in. 12 in. 2.5 in. 6 in. 30 in.