Formula
Pu = 0.4 × fck × Ac + 0.67 × fy × Asc
(IS 456:2000 Clause 39.3)
300×300mm, M25, Fe415, 2% steel:
Asc=1800mm² Ac=88200mm²
Safe Load = 1,383 kN
Frequently Asked Questions
IS 456 specifies minimum 0.8% and maximum 6% steel in RCC columns. Typically 1–4% is used in practice.
M25 is minimum recommended for RCC columns per IS 456. High-rise buildings commonly use M30 to M40.