High shear regions for large web openings as defined in SCI P355
Advisory Desk Note 548
Document Status
Current
Supplement
Civil & Structural Supplement
Series
Advisory Desk Note
Abstract
This Advisory Desk note clarifies the definition of "high shear" regions in the context of large web openings in composite beams, as outlined in SCI publication P355. According to P355, a high shear region is defined where the design shear force exceeds half the maximum design shear force acting on the beam. This classification influences the geometric limits for web openings, with stricter requirements applied in high shear zones. Table 2.1 of P355 provides practical limits for opening dimensions and web-post widths, derived from typical composite beam designs.
History
September 2025 edition.
Subjects
- Building structure
- Steel building systems/frame
- Building systems/frame
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.
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