Similar International Standards
ANSI/AISC 360-22AISC (American Institute of Steel Construction), USA
MediumCurrent
Specification for Structural Steel Buildings
Covers design of all steel building structures, including Hollow Structural Sections (HSS), but is primarily based on Limit State Design (LSD).
EN 1993-1-1:2005CEN (European Committee for Standardization), Europe
MediumCurrent
Eurocode 3: Design of steel structures - Part 1-1: General rules and rules for buildings
The primary European standard for steel building design, including circular and rectangular hollow sections, based on Limit State Design.
BS 5950-1:2000BSI (British Standards Institution), UK
MediumWithdrawn
Structural use of steelwork in building - Part 1: Code of practice for design - Rolled and welded sections
Predecessor to Eurocode 3 in the UK; covered tubular structures and transitioned from Allowable Stress to Limit State design in later versions.
CIDECT Design Guide 1 (3rd Edition)CIDECT (International Committee for the Development and Study of Tubular Construction), International
LowCurrent
Design guide for circular hollow section (CHS) joints under predominantly static loading
A specialized, non-mandatory guide focusing specifically on the design of joints in tubular structures, which is a weakness of IS 806.
Key Differences
≠IS 806:1968 is based on the Allowable Stress Design (WSD) philosophy, which uses a single factor of safety on material stresses. Modern international standards like Eurocode 3 and AISC 360 are based on Limit State Design (LSD), using partial safety factors for loads and material resistances.
≠IS 806 uses a single, simplified formula for determining the allowable compressive stress for columns. Eurocode 3 uses a system of multiple buckling curves (a, b, c, d, a0) that account for section shape, manufacturing process (hot-finished vs. cold-formed), and residual stresses.
≠The guidance on connection design in IS 806 is very basic and general. Modern codes and specialized guides (like CIDECT) provide extensive, empirically validated formulas for various joint types (K, N, Y, KT) and failure modes (e.g., chord plastification, punching shear).
≠IS 806 references outdated steel material specifications (e.g., St 32, St 42 from IS 1161:1963). Current international standards specify modern, high-strength steels with much stricter quality control and a wider range of available grades (e.g., S355, S420 in Europe; Gr. B, Gr. C in ASTM A500).
≠Modern codes like Eurocode 3 classify sections (Class 1-4) based on their susceptibility to local buckling, which determines their suitability for plastic design. IS 806 does not use such a classification system and implicitly prevents plastic design by its stress limits.
Key Similarities
≈Both IS 806 and modern standards are founded on the same fundamental principles of structural mechanics, such as equilibrium of forces and moments.
≈The concept of using an 'effective length' (kL) for compression members to account for end-restraint conditions is a fundamental principle shared between IS 806 and all major international codes, although the specific k-factors may differ.
≈The general scope is similar: providing rules for the safe design of steel tubular members (columns, beams, trusses) in building structures against various actions like dead, live, and wind loads.
≈Both IS 806 and modern standards like AISC 360 (in its ASD portion) specify the permissible axial tensile stress on the gross section as a similar fraction of the steel's yield strength (0.6 * fy).