IS 800:2007 is the fundamental code of practice for general structural steel design in India. It mandates the Limit State Method (LSM) for designing steel tension members, compression members, flexural members, and connections, ensuring safety, stability, and durability of steel structures under various loads.
Provides guidelines for design, fabrication, and erection of steel structures.
Quick Reference Values
Young's Modulus of Steel (E)200,000 N/mm²
Density of structural steel7850 kg/m³
Poisson's ratio (elastic range)0.30
Partial safety factor for yield stress (γm0)1.10
Partial safety factor for ultimate stress (γm1)1.25
Partial safety factor for shop welding (γmw)1.25
Partial safety factor for field welding (γmw)1.50
Max slenderness ratio for members carrying compressive loads from dead and imposed loads180
Key Formulas
Tdg = Ag * fy / γm0 — Design strength in tension due to yielding of gross section
Pd = Ae * fcd — Design compressive strength, where fcd depends on buckling class and slenderness
Md = βb * Zp * fy / γm0 — Design bending strength for laterally supported beams
Vd = Vn / γm0 = (Av * fyw / √3) / γm0 — Design shear strength
Practical Notes
Always check section classification (plastic, compact, semi-compact, slender) before calculating bending strength, as it dictates the effective section properties and whether plastic moment capacity can be utilized.
Pay close attention to buckling classes (a, b, c, d) when calculating compressive strength. The class depends on the cross-section shape, thickness, and axis of buckling.
For bolted connections, ensure the distinction between bearing type bolts and friction grip (HSFG) bolts is correctly applied, as their force transfer mechanisms and design formulas differ significantly.
Deflection limits in Table 6 vary based on whether the cladding is brittle (e.g., masonry) or elastic (e.g., metal sheets).