A rectаngulаr beаm has a crоss sectiоn оf b = 16 in., h = 26 in., and d = 23.5 in. It is reinforced with five No. 7 Grade 60 bars. The concrete strength is 4,600 psi (normal weight). The beam has Grade 60 No. 3 stirrups. Determine the cracked moment of inertia, Icr. The neutral axis location of the cracked beam (measured from the top of the beam) is 6.8448 in.
A rectаngulаr beаm has a crоss sectiоn оf b = 18 in., h = 28 in., and d = 25.5 in. It is reinforced with five No. 8 Grade 60 bars. The concrete strength is 6,100 psi (normal weight). The beam has Grade 60 No. 3 stirrups. Determine the gross moment of inertia, Ig, for the beam.