For the given one-way slab supported by beams as shown below, calculate the required spacing of #4 rebar at location B and D, also check for maximum shear. Assume the concrete cover to be 0.75". if f'c = 4 ksi, fy = 60 ksi, normal weight concrete, Loads are WD-70 psf, WL=80 psf, Ln=20 ft, include the self-weight of the slab as dead load. Slab thickness of 10 inches. 1' A 20' C D 1' E 20' D D 1' E 20' 1'