a reinforced concrete beam with a section of 12 inches width and 24 inches depth is reinforced with 3no. 9 bars. fc'=5000psi and fy=60000psi. a 2 inch cover is used and the beam has a simply supported span lenght of 15ft. if the beam was found to have a cracks of 4inches at the bottom of mid span. chek whether the existing crack is safe.
determine the remaining load carrying capacity of this cracked beam.