Multiple choice

Consider two RCC beams P and Q, each having the section 400 mm x 750 mm (effective depth, d = 750 mm) made with concrete having a $\tau_{c max}$= 2.1 N/mm2. For the reinforcement provided and the grade of concrete used, it may be assumed that the $\tau_c$= 0.75 N/mm2. The design shear in beam P is 400 kN and in beam Q is 750 kN. Considering the provisions of IS 456 — 2000, which of the following statements is TRUE?

  1. Shear reinforcement should be designed for 175 kN for beam P and the section for beam Q should be revised.

  2. Nominal shear reinforcement is required for beam P and the shear reinforcement should be designed for 120 kN for beam Q.

  3. Shear reinforcement should be designed for 175 kN for beam P and the shear reinforcement should be designed for 525 kN for beam Q.

  4. The sections for both beams P and Q need to be revised.
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