why there is need to provide shear reinforcement?give the
basic reason?
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Answer Posted / rohit agarwal
Shear reinforcement, as name implies, is to provide the
resistance against shear forces to which a beam is
subjected to and is usully in the form of stirrups which
also serve the purpose of holding the main tensile and
compression reinf in place. Now the basic doubt here is,
although, if the stirrups are provided to resis the shear
force, why are these provided parallel to shear force and
this way how will they resist shear force. Thats for two
main reasons -
1. shear force does'nt directly acts at stirrups but gets
transmitted through tensile and compression reinf, thus
shear stirrups actually bear the shear force as like a
tensile bar.
2. the profile of crack developed due to shear force shall
not be absolutely vertical (in case of beam) as there are
other forces acting also and because of this the crack
shall be always be inclined and if stirrups are there, the
crack profile shall pass through the stirrups and shall be
resisted.
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