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REINFORCEMENT DETAILING IN BEAMS
Reinforcement are provided to resist tensile stresses due to
bending and
shear in beams for singly reinforced sections. But when depth of
section isrestricted due to reasons such as architectural reasons,
or basement floors,
the beam section is designed as doubly reinforced to resist
tensile as well as
compressive stresses and are provided with reinforcement in
compression
face.
Beams when subjected to torsion are provided additional
longitudinal and
shear reinforcement to resist bending and shear stresses
developed due to
torsion.
In practice, for singly reinforced beams, two additional bars
are provided in
compression face of the beam so that stirrups can be tied with
bars. These
additional reinforcement are of nominal diameter of 8mm or
1mm.
!hen the width of beam is insufficient for number of bars to be
provided,
"eeping minimum clear distance bars based on ma#imum si$e of
aggregate
as per standard code guidelines, the reinforcement can be
provided in layers
in both tension and compression face of the beam. These
reinforcement are
provided as straight bars in both $ones.
!hen a beam is designed with slab, called slab beam or
Tee%beam,
reinforcements are provided as shown in figure below. The beam
is generally
designed as simple beam but additional reinforcement are
provided on top
with slab to ma"e it behave li"e a Tee%beam.
Fig: Mid-span Details of Tee-Beam
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Fig: Standa#d !ends and %oo&s in !eams
C$#tailment of Reinfo#'ement in Beams:
Reinforcements are curtailed along its length in beams depending
on the
bending moment at the section. /nchorage or development length
re)uired
at support is provided during curtailment of reinforcement. The
anchoragelength re)uired for main reinforcement in tension and
compression is given
in cl.*+.* of I( -+ *.
Typical details of curtailment of reinforcement in cantilever
and continuous
beams are shown in figure below'
