Light Steel Frame (LSF) construction is gaining global popularity due to its efficiency, lightweight nature, and versatility. However, proper structural performance and safety depend heavily on adherence to well-established design codes and standards. Here are the most important international codes that guide the design, analysis, and fabrication of LSF structures:
 
1. AISI Standards (North America)
The American Iron and Steel Institute (AISI) provides comprehensive guidelines for cold-formed steel design, which are widely used in the U.S. and many other countries. Key documents include:
•    AISI S100: North American Specification for the Design of Cold-Formed Steel Structural Members
•    AISI S240: North American Standard for Cold-Formed Steel Structural Framing
•    AISI S400: Seismic Design of Cold-Formed Steel Structural Systems
These standards are often referenced in U.S. building codes and are critical for both structural and seismic design.
 
2. Eurocode (Europe)
In Europe, Eurocode 3 is the primary standard for steel structure design. For cold-formed steel, the relevant part is:
•    EN 1993-1-3: Design of steel structures – Supplementary rules for cold-formed members and sheeting
This standard covers the calculation of load-bearing capacity, stability, and detailing for cold-formed profiles used in LSF systems.
 
3. AS/NZS Standards (Australia and New Zealand)
Australia and New Zealand have jointly developed a set of standards tailored to their construction environment:
•    AS/NZS 4600: Cold-Formed Steel Structures
•    NASH Standards: Published by the National Association of Steel-Framed Housing, these are practical guidelines specifically developed for residential and low-rise steel framing in Australia.
The AS/NZS 4600 standard is recognized internationally for its clarity and precision in cold-formed steel design.
 
4. BS 5950 (United Kingdom - Legacy Standard)
Although the UK has transitioned to Eurocodes, BS 5950 Part 5 was historically used for the design of cold-formed thin gauge sections. Some designers in former British territories may still refer to this standard.
 
5. SANS Standards (South Africa)
•    SANS 10162-2: Structural Use of Steel - Part 2: Limit-State Design of Cold-Formed Steelwork
This standard is commonly used in South African engineering practice and is based on principles similar to AISI and AS/NZS standards.
 
Conclusion
Using the correct design code is essential for the safe and efficient performance of any LSF structure. While the core engineering principles are similar, each code has its own specific approach to design limits, safety factors, and detailing rules. Designers should always ensure they are using the standard that is recognized and approved in the region where the project is located.
Whether you are building a residential home, commercial facility, or modular structure, compliance with these standards ensures durability, safety, and long-term value.