The maximum eccentricity to be considered in a reinforced concrete column of length l is
- Al/400 + lateral dimension/30
- Bl/500 + lateral dimension/30Correct
- Cl/500 + lateral dimension/25
- Dl/400 + lateral dimension/25
Solution
Concept
Minimum eccentricity in columns (IS 456 cl. 25.4)
Formula
emin = l/500 + D/30 ≥ 20 mm
Step-by-step solution
1. IS 456: emin = l/500 + D/30, not less than 20 mm.
Explanation
Even a nominally axial column is designed for this accidental eccentricity.
Why the other options are wrong
l/400 and D/25 are not in IS 456.
Shortcut
l/500 + D/30.
Common mistake
Using l/400.
Correct answer: B) l/500 + lateral dimension/30