Canadian Reinforcing Steel System When splicing a 10M reinforcing steel bar which has a diameter of 11.3mm, the minimum lapped splice length is: 40 x 11.3mm = 452mm. Example: US Reinforcing Steel System When splicing a #5 reinforcing steel bar which has a diameter of 0.625 inches, the minimum lapped splice length is: 40 x 0.625 inches = 25 inches The relative safety of the latter four design procedures improves for lap splices. A provision in ACI 318‐05 that allows a 20% reduction in development and lap splice length for bars smaller than 19 mm appears to be unsafe and should be removed or modified.
The primary objective of the research reported in this paper was to evaluate the effect of using self compacting concrete on the bond strength and mode of bond failure of tension lap splices anchored in normal strength concrete (NSC). Studies on the effect of transverse reinforcement on anchored reinforcement in self compacting concrete to prevent brittle mode of failure is limited. To meet ... Lap splice length not less than 12 in. (305 mm) nor 40 d b. Minimum lap lengths may be smaller in cases where f s 0.8F s. B Bars larger than No. 9 (M#29) are required to be spliced by mechanical connectors. C Lap splice lengths are to be increased by 50% when epoxy coated reinforcement is used. D Bar size not to exceed 1/ 8
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