Advisory Desk Note 543 Deflection of composite slabs

Publication Year

2025

Document Status

Current

Abstract

This SCI Advisory Note provides guidance on deflection control in steel-concrete composite slabs, particularly when span-to-depth ratios exceed recommended limits. It explains that deflection calculations can be omitted if certain span ratios and test conditions are met, but if limits are exceeded, elastic analysis should be used. The note outlines factors affecting deflection, including creep, shrinkage, propping conditions, and material stiffness, referencing both current and second-generation Eurocode provisions. It clarifies effective depth definitions, adjustment methods, and acceptable deflection limits, offering practical advice for designers to ensure compliance with serviceability requirements.

Document History

April 2025 edition.

Publisher Information