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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 $ones.
!hen a beam is designed with slab, called slab beam or Tee%beam,
reinforcements are provided as shown in figure below. The beam is generally
designed as simple beam but additional reinforcement are provided on top
with slab to ma"e it behave li"e a Tee%beam.
Fig: Mid-span Details of Tee-Beam
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Fig: Sla!-Beam Details
&ollowing are the types of stirrups provided in beams'
Fig: T"pes of sti##$ps in !eams
(tandard bends and hoo"s re)uired for reinforcing bars are shown in figure
below. The specification for detailing of reinforcement in beams are given in
cl.*+..1 of I( -+ *.
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Fig: Standa#d !ends and %oo&s in !eams
C$#tailment of Reinfo#'ement in Beams:
Reinforcements are curtailed along its length in beams depending on the
bending moment at the section. /nchorage or development length re)uired
at support is provided during curtailment of reinforcement. The anchoragelength re)uired for main reinforcement in tension and compression is given
in cl.*+.* of I( -+ *.
Typical details of curtailment of reinforcement in cantilever and continuous
beams are shown in figure below'
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Fig: T"pi'al Details of Reinfo#'ement '$#tailment in !eams
0etails of anchorage length re)uired for main reinforcement in tension and
compression is shown below'
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Fig: T"pi'al
Details of an'%o#age lengt% of #einfo#'ement in !eams