Question: the figure shows the cross section of a reinforced concrete...
The figure shows the cross section of a reinforced concrete beam that is simply supported and subjected to a single point load, P, at mid-span and self-weight.
f’c = 4,000 psi fy = 60,000 psi L = 35 ft
For the beam shown: 1.) For As = 3 # 9’s, calculate the load, P, that will cause: a. Cracking of the section b. fs = 24 ksi c. fc = 0.45*f’c 2.) For the following reinforcement patterns, calculate the load P at failure: a. 3 # 10’s b. 3 # 7’s