1. Determine the cracking moment for the section shown. Use f= 4000 psi, and modulus of rupture f, =7.5 √.Use the gross moment of Inertia. Compression on top and Tension on the bottom. 20" 4 #8 3" 26" 2. Calculate the uniform load (in addition to the beam weight) which will cause the section to begin to crack if it is used for 28-ft simple span. Use f= 4000 psi, and modulus of rupture fr =7.5 √√ bottom. Reinforced concrete weight=150 lb/ft³ Use the gross moment of Inertia. Compression on top and Tension on the 4" 22" 30" 3 #8 12" 4"