Problem 1 Use a Whitney Stress Block assumption to calculate the nominal moment capacity Mn for the cross- sections of beams A and B shown below. Assume fe = 4 ksi and fy = 60 ksi. Assume no strain hardening or over-strength of the steel reinforcement. Problem 2 Calculate and plot the Moment-Curvature relation for cross-section B for the following points: (a) Just prior to cracking (b) Just after cracking (c) First yield of tension reinforcement (d) For an extreme fiber compression strain of 0.003 using a Whitney Stress Block assumption. 4" 3" 4 - #9 14 in. 7 in. Beam A 2 - #6 4 - #9 14 in. Beam B 2.5" 2.5" T 24 in.