Question

Which one of the following rules ascertains the maximum permissible eccentricity of loads on circular column so that stresses will always be compressive?

• A. Middle fourth rule
• B. Middle third rule
• C. Middle half rule
• D. Middle two-third rule

Answer 1

The correct option is A Middle fourth rule

For no tension, ${\sigma }_{min}\ge 0$
$\frac{P}{A}-\frac{My}{I}\ge 0$
$\frac{P}{\frac{\pi }{4}{D}^2}-\frac{Pe\frac{D}{2}}{\frac{\pi }{4}{D}^4}\le 0$
$e\le \frac{D}{8}$
For no tension load should be within one-fourth of diameter.