Discussion
For a circular section of diameter 'D', there will be no tensile stress, if the load lies in a circle of diameter '\(\frac{D}{4}\)' with centre 'O' of the main circular section is known as :
Answer: D
It is the middle quarter rule for circular section.
When a column carries an eccentric load, the bending stress it causes opposes the direct compressive stress on one side. For a solid circular section of diameter D, the section stays free of tension as long as the eccentricity does not exceed D/8, that is, the load lies within a central circle of diameter D/4. This core is the middle quarter, hence the name.
The rectangular counterpart is the middle third rule. The zeroth law belongs to thermodynamics, and 'third rule' and 'Archimedes rule' are not names for this kern.
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