Slender Beams (Beams: ACI 318) 1 of 1 https://teklastructuraldesigner.support.tekla.com/webhelps/tsd/2018/All... Home / Reference Guides / Concrete Design - ACI / Beam Design to ACI 318 / Slender Beams (Beams: ACI 318) Slender Beams (Beams: ACI 318) Spacing of lateral supports for a beam shall not exceed 50*b. 1 In the program the lateral supports are taken as the distance between the faces of the supports, and for simplifica on, b is taken as the web width bw IF above check fails then a Warning and a text 'Slender span' or 'Over wide distance between lateral supports' is displayed. Effects of lateral eccentricity of load are considered in determining spacing of lateral supports. Parent topic • Beam Design to ACI 318 1. ACI 318-08:2008 and ACI 318-11:2011 Sec on 10.4 18-03-2019, 15:26