Question

A hollow rectangular column has external and internal dimensions as 2.4m × 1.8m and 1.2m × 1.2m respectively. Calculate the safe load that can be placed at an eccentricity of 0.5 m on a plane bisecting the longer side, if the maximum compressive stress is not to exceed 5 MN/m\(^2\).

• A. 72 kN
• B. 270 kN
• C. 720 kN
• D. 27 kN

Hint:

- Consider eccentricity effects while calculating safe loads. - Hollow sections have higher strength-to-weight ratio.

Answer 1

The Correct Option is C

- Stress at any point is given by: \[ \sigma = \frac{P}{A} + \frac{P e}{Z} \] - Substituting values: \[ P = 720 \text{ kN} \]