Reinforcement Spacing Limits

The reinforcement clear spacing is limited to:

S_min= 1in

From ACI-7.6.1

S_min = d_b

s_{\max} = \frac{540}{0.6 f_{y}} - 2.5 c_{c}

Equation ACI 10-5

S_max = 12(36/0.6f_y)

From ACI-10.6.4

where

f_y	=	yeild strength, in ksi
c_c	=	$h - d - \frac{d_{b}}{2}$ - 1 bar layer $h - d - \frac{d_{b}}{2} - 0.5 in.$ - 2 bar layers