Problem 7.5 For the cantilever beam shown, determine the point where two bars theoretically can be cut off from the standpoint of the calculated moment strength, M,, of the beam. f, = 60,000 psi and f = 3000 psi. (Ans. 9.09 ft from free end) -16 in.- 3 @ 3 in. = 9 in. W₁ = 6 k/ft -12 ft- 3½ in. 3 in. #3 4 #9 stirrups 29 in. 32 in.