This standard provides guidelines for the material, design, and construction of permanent steel formwork systems for concrete structures. It addresses design for the construction stage (supporting wet concrete) and for the final composite section where the formwork contributes to the structure's strength.
Provides guidelines for the design and construction of permanent steel formwork systems for concrete.
Quick Reference Values
Minimum thickness of steel sheet0.5 mm
Minimum mass of zinc coating275 g/m² (as per IS 277)
Maximum deflection under wet concrete weightLesser of Span/180 or 20 mm
Maximum deflection for propped construction under superimposed loadSpan/360
Maximum deviation in level from specified±10 mm
Key Formulas
Bending stress checks for formwork during construction stage (referencing IS 800 principles)
Shear-bond stress calculation at the steel-concrete interface for composite action (τ = V / (Le * b))
Practical Notes
Ensure proper detailing and sealing of joints and overlaps between formwork panels to prevent slurry leakage, which can compromise the concrete quality.
Strictly adhere to the manufacturer's specified propping scheme during construction, as the formwork's design is based on specific support conditions.
For composite design, the surface of the steel formwork must have embossments or indentations to ensure adequate mechanical interlock and shear bond with the concrete.