With regard to the shear design of RCC beams, which of the following statements is/are TRUE?

Excessive shear reinforcement can lead to compression failure in concrete
Beams without shear reinforcement, even if adequately designed for flexure, can have brittle failure
The main (longitudinal) reinforcement plays no role in the shear resistance of beam
As per IS456:2000, the nominal shear stress in the beams of varying depth depends on both the design shear force as well as the design bending moment

Correct answer: Beams without shear reinforcement, even if adequately designed for flexure, can have brittle failure

Solution

Beams that lack shear reinforcement are susceptible to brittle failure, regardless of their flexural design, because they may not adequately resist shear forces, leading to sudden and catastrophic failure.

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