This code provides guidelines for the design and construction of isolated reinforced concrete footings. It covers the determination of footing dimensions based on soil bearing capacity and the structural design of the footing for bending moment and shear, including reinforcement detailing.
Provides guidelines for the structural design and construction of isolated footings subjected to vertical loads and moments.
Quick Reference Values
Minimum clear cover to reinforcement50 mm
Minimum thickness at footing edge (on soil)150 mm
Critical section for one-way sheardistance 'd' from column face
Critical section for two-way (punching) sheardistance 'd/2' from column periphery
Minimum reinforcement (HYSD bars)0.12% of gross cross-sectional area
Minimum reinforcement (Mild Steel)0.15% of gross cross-sectional area
Key Formulas
A = (P_total) / q_a — Area of footing = Total Load / Safe Bearing Capacity
τv_oneway = Vu / (b*d) — Nominal shear stress for one-way shear
τv_punching = Vu / (bo*d) — Nominal shear stress for two-way shear
Practical Notes
This is an older code. While still in force, many design aspects are now directly covered in IS 456:2000 (Clause 34), which should be used for material properties and limit state design principles.
The design process is often iterative: assume a footing depth, check for one-way and two-way shear, and increase depth if the checks fail.
The specified minimum cover of 50 mm should be considered the absolute minimum; for aggressive environments, refer to the durability requirements in IS 456.