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In shear design of an RC beam, other than the allowable shear strength of concrete (τ_c), there is also an additional check suggested in IS 456-2000 with respect to the maximum permissible shear stress (τ_cmax). The check for τ_cmax is required to take care of

1. additional shear resistance from reinforcement
2. additional shear stress that comes from accidental loading
3. possibility of failure of concrete by diagonal tension
4. possibility of crushing of concrete by diagonal compression

Correct answer: possibility of crushing of concrete by diagonal compression

Solution

The check for maximum permissible shear stress (τ_cmax) is necessary to ensure that the concrete does not fail due to diagonal compression, which can occur under high shear forces. This consideration helps prevent structural failure by ensuring that the concrete can withstand the compressive stresses that develop in the diagonal planes of the beam.

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