Design parameters for longitudinal bars (concrete column: ACI 318)

For some of the longitudinal reinforcement design parameters, additional user defined limits can be applied - where this is the case minimum and maximum values are specified in Design Options > Column > Reinforcement Layout.

Minimum Longitudinal Bar Spacing

For design to ACI ;


minimum clear distance	`≥`	MAX (1.5 * longitudinal db , 1.5in., 1.33*hagg)	US units
minimum clear distance	`≥`	MAX (1.5 * longitudinal db , 40mm, 1.33*hagg)	metric units

where


d _b	`=`	bar diameter
h _agg	`=`	aggregate size

Maximum Longitudinal Bar Spacing

You are given control over this value by specifying an upper limit in Design Options > Column > Reinforcement Layout.

Minimum Longitudinal Total Steel Area

For design to ACI;

1% * column area

Maximum Longitudinal Total Steel Area

For design to ACI;

8% * column area