Minimum shear reinforcement in beams is provided in the form of stirru...
The minimum shear reinforcement is provided for the following:
(i) Any sudden failure of beams is prevented if concrete cover bursts and the bond to the tension steel is lost.
(ii) Brittle shear failure is arrested which would have occurred due to principal tension without shear reinforcement.
(iii) Tension failure is prevented which would have occurred due to shrinkage, thermal stresses and internal cracking in beams.
(iv) To hold the reinforcement in place when concrete is poured.
(v) Section becomes effective with the tie effect of the compression steel.
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Minimum shear reinforcement in beams is provided in the form of stirru...
Explanation:
Shear reinforcement in beams is provided to resist the shear force acting on the beam. There are different types of shear reinforcement, such as stirrups, bent-up bars, and shear links. Among these, stirrups are the most commonly used.
The minimum shear reinforcement in beams is provided in the form of stirrups. The main purpose of providing stirrups is to resist principal tension. When a beam is subjected to bending, there are two types of stresses acting on it: compressive stress on the top and tensile stress on the bottom. The tensile stress on the bottom of the beam is called principal tension. Stirrups are provided to resist this tension.
Stirrups are placed perpendicular to the longitudinal reinforcement of the beam. They are placed at a certain spacing along the length of the beam. The spacing of stirrups depends on the shear force acting on the beam. The larger the shear force, the closer the spacing of stirrups.
Stirrups are also provided to resist shear cracks at the bottom of the beam. When the shear force acting on the beam exceeds a certain limit, cracks start to develop at the bottom of the beam. These cracks can be prevented by providing stirrups. Stirrups hold the longitudinal reinforcement in place and prevent it from slipping, which in turn prevents the formation of shear cracks.
Conclusion:
In conclusion, the minimum shear reinforcement in beams is provided in the form of stirrups to resist principal tension and shear cracks at the bottom of the beam. Stirrups are placed perpendicular to the longitudinal reinforcement and at a certain spacing depending on the shear force acting on the beam.