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For reinforced or prestressed slabs in buildings subjected to bending without significant axial tension, specific measures to control cracking are not necessary where the overall depth does not exceed 200 mm and relative provisions have been applied. When the minimum reinforcement is provided, crack widths are unlikely to be excessive if:

• for cracking caused dominantly by restraint, the bar sizes given in Table 2 are not exceeded where the steel stress is the value obtained immediately after cracking,

• for cracks caused mainly by loading, either the provisions of Table 1 or the provisions of Table 2 below are complied with. The steel stress should be calculated on the basis of a cracked section under the relevant combination of actions.

 

Table 1: Maximum bar spacing for crack control (Eurocode 2– Table 7.3Ν)

 

 

Table 2: Maximum bar diameters φ^*_s for crack control (Eurocode 2– Table 7.2Ν)