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It depends types of loading(tension, compression) strenght of concrete, steel, methods of splicing i.e. mechanical splice, welded splice, end bearing etc.
A comprehensive detail is included in ACI, BS & BSC
ACI = Amercan Concrete Institude
BS = British specification ( British Standards)
SBC = Saudi Building Code
In normal method, conservative formula is used for splices which is applicable for all codes.i.e.
Splice Length = 50 * dia of steel bar.
e.g. for 20mm dia bar
Splice length =50*20 =1000mm=1m
for further detail, please refer to
BS 81101997
ACI 12.17.2 — Lap splices in columns
50 times dia of bar
dia of bar : maximum dia used in the column
