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Question
Minimum shear reinforcement in beams is provided in the form of stirrups
Minimum shear reinforcement in beams is provided in the form of stirrups
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Solution
The correct option is C to resist principal tension
(c)
The shear at which the inclined crack in beam without shear reinforcement is formed first, is taken as the shear strength of concrete as the difference between the loads corresponding to the first crack and the ultimate failure is very less. Formation of such crack occur when ihe principal tensile stress reaches the tensile strength of concrete. At the mid-span of a simply supported beam subjected to uniformly distributed load. where shear is small and bending stress is large, the direction of principal tensile stress is flat and is nearly equal to the flexural tensile stress. This will cause flexural cracks nearly vertical to the axis of the beam.
These are initiated even when 0.5τc<τv<τc·
Thus minimum reinforcement is needed to prevent flexural crack due to principal tension.
(c)
The shear at which the inclined crack in beam without shear reinforcement is formed first, is taken as the shear strength of concrete as the difference between the loads corresponding to the first crack and the ultimate failure is very less. Formation of such crack occur when ihe principal tensile stress reaches the tensile strength of concrete. At the mid-span of a simply supported beam subjected to uniformly distributed load. where shear is small and bending stress is large, the direction of principal tensile stress is flat and is nearly equal to the flexural tensile stress. This will cause flexural cracks nearly vertical to the axis of the beam.
These are initiated even when 0.5τc<τv<τc·
Thus minimum reinforcement is needed to prevent flexural crack due to principal tension.
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