where A = area of concrete surrounding each bar (A = A8/n, where n is
the number of bars) in square inches, and the steel stressfs is in psi (1 in =-
25.4 mm; 1 psi = 0.00689 N/mmz). The measured maximum crack widths
from which Eq. 10.60 was derived showed a scatter of up to i40‘X, from the
equation. To obtain the maximum crack width at the extreme tension fiber
for beams reinforced by-.6 deformed bars, Kaar and Hognestadw“ modified
Eq. 10.60 to