Problem 7.21 Are the uncoated #8 bars shown anchored older sufficiently with their 90° hooks? f = 4000 psi and f, = 60 ksi. Side and top cover is 2½ in. on bar extensions. Normal-weight 014 concrete is used. A = 2.20 in.². (Ans. h = 12.4 in., ob sufficient) s required dh 12 in. clear bas пов -2 in. clear 3 #8 -16 in.- 14 in.