In-plane member buckling lengths for portal frames
Advisory Desk Note 536
Document Status
Current
Supplement
Civil & Structural Supplement
Series
Advisory Desk Note
Abstract
This SCI Advisory Note (AD 536) addresses confusion around in-plane buckling lengths for members in portal frames, particularly when using general structural analysis software that requires input of buckling lengths in both axes. It reaffirms that in-plane verification of portal frame members is achieved by checking the overall frame stability and, if necessary, applying second-order analysis; individual member in-plane buckling lengths are not required. The note advises designers to disregard outdated guidance from SCI publication P397 and SN03la, which do not reflect typical UK pitched roof portal frame practice. It refers designers to SCI P399 for accurate Eurocode-based procedures.
History
January 2025 edition.
Subjects
- Materials
- Building systems/frame
- Building structure
- Steel building systems/frame
- Metal sections/other items
- Steel
Publisher History
With over 30 years experience, the Steel Construction Institute provide technical expertise and best practice to the steel construction sector.
Information
NBS
NBS has produced specification systems and information products for construction industry professionals for more than 40 years. The National Building Specification is the recognised UK national standard and is used by over 5,000 organisations. NBS is part of RIBA Enterprises Ltd.
Accuris
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