A Case Study on Comparison of Column reinforcement with Couplers and without couplers as Lap Splices

Abstract

Regular construction practices focus makes use of
reinforcing bars for transferring forces. Method of lap Splice is
generally used for ensuring continuity of reinforcement steel.
However, this method results in minor defects such as joint
failure, inadequate length for lapping, improper welding of
bars, increased cost of labor etc.
A comparative study of column reinforcement with couplers
and without couplers as lap splices was carried out through a
case study of an under construction building. Initially the
quantity of reinforcing bars required for conventional lap
splicing of columns was estimated. The value of steel for
providing lap splices within the columns was also determined.
Finite element analysis of coupled rebar is carried out to check
for the yielding and ultimate stresses developed. These values
are verified with that specified in the code. The use of couplers
significantly decreases construction time and quantity of steel
required in lapping.
The use of couplers as lap splices provides an economic way
of connecting reinforcement without adversely affecting the
strength of the joint.