The requirement of the LRFD Section 18.104.22.168 “Control of Cracking by Distribution of Reinforcement” for skin reinforcement shall be modified as follows:
If the depth of non-prestressed or partially prestressed members, h, exceeds 3.0 ft., longitudinal skin reinforcement shall be uniformly distributed along both side faces of component for a distance dt/2 from the tension face. It shall be permitted to include such reinforcement in strength computations if a strain compatibility analysis is made to determine stress in the individual bars or strands. Equation 22.214.171.124-2 shall be revised as follows:
dt = distance from extreme compression fiber to centroid of extreme tension steel (in.)
The total area of longitudinal skin reinforcement (per face) need not exceed one-fourth of the required flexural tensile reinforcement As+Aps. The maximum spacing of skin reinforcement shall not exceed either dt/6 or 12 in.
cc: Mohammad Sheikhizadeh, Bridge Construction - 47354