In CHBDC , fatigue is only checked if the fatigue load groups is selected and is carried out as specified in Art. 8.5.3.

Substructure checks the stress range in the reinforcement for fatigue load combinations. If all load combinations produce tension in rebar, the stress range is equal to the largest stress value. However, if some combinations produce compression and others produce tension in the reinforcement; the stress range is obtained by adding the two absolute stresses together. The minimum stress level, fmin, is computed due to larger of the permanent loads and the permanent loads plus creep and shrinkage accompanied with minimum live load. Program checks the ratio between calculated stress range and the permissible fatigue stress range as per Art. 8.5.3.1. If the ratio exceeds 1, program flags the location.