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

Tekla Structural Designer
Modified: 2 Jun 2023
2024
Tekla Structural Designer

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

Note: For some of the longitudinal reinforcement design parameters, additional user defined limits can be applied - where this is the case minimum and maximum values can be specified from the Design tab on the ribbon by clicking Settings > Concrete > Wall > 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
db = bar diameter
hagg = aggregate size
    
 

Maximum Longitudinal Bar Spacing

You are given control over this value by specifying an upper limit via the Design Settings as mentioned in the Note above.

Minimum Longitudinal Total Steel Area

For design to ACI;

1% * column area

Maximum Longitudinal Total Steel Area

For design to ACI;

8% * column area

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