Multiple choice

Top ring beam of an Intze tank carries a hoop tension of 120 kN. The beam cross section is 250 mm wide and 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

  1. 1.02

  2. 1.07

  3. 1.20

  4. 1.32
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The hoop tension is resisted by the concrete and the steel reinforcement. Using the modular ratio m=10, the equivalent area of concrete is A_eq = A_c + (m-1)A_s. The tensile stress in concrete is sigma_c = T / A_eq.

Keep practicing — related questions