Side skin reinforcement in beams (ACI 318)
Where h of a beam or joist exceeds 900mm (36 in.), longitudinal skin (side) reinforcement is uniformly distributed along both side faces of the member1.
The code requires that skin reinforcement shall extend for a distance h/2 from the tension face. Regardless of this in the current release of Tekla Structural Designer the skin reinforcement is provided to the full height of the beam.
Footnotes
1 ACI 318-08 Section 10.6.7 ; ACI 318-11:2011 Section
10.6.7 ; ACI 318-14 Section 9.7.2.3; ACI 318-19 Section 9.7.2.3