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Top ring beam of an Intze tank carries a hoop tension of 120 kN. the beam cross-section is 250 mm wide the 400 mm deep and it is reinforced with 4 bars of 20 mm diameter of Fe 415 grade. Modular ratio of the concrete is 10. The tensile stress in N/ mm2 in the concrete is
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- 1.02
- 1.07
- 1.20
- 1.32
Correct Option: B
Area of reinforcement
| = 4 × |  |  | × 202 = 1256.63 mm2 | 4 |
Equivalent area of concrete = m. Ast + (250 × 400 – Ast)
= 10 × 1256.6 + (250 × 400 – 1256.6)
= 111309.6 mm2
Stress in concrete
| = | = 1.078 N/mm2 | 11309.6 |
