Calculating Fire Resistance of Glulam Beams and Columns
Technical Note
Structural glued laminated timber (glulam) beams and columns offer exceptional architectural appeal combined with natural fire resistance. This technical document provides comprehensive guidance on calculating fire resistance for glulam members using two analytical methods recognized by the International Building Code (IBC), enabling engineers to design timber structures that meet one-hour and two-hour fire rating requirements.
This publication is designed for: engineers, architects, designers, building code officials
The document presents detailed calculation procedures for both the National Design Specification (NDS) Chapter 16 method and the Legacy T.T. Lie Method. Complete design examples demonstrate the step-by-step process for determining adequate member sizes. Additional guidance covers proper specification of fire-rated glulam layups and protection details for metal fasteners and connections.
Key Sections Include:
Introduction to fire performance characteristics of glulam
Method A: NDS Chapter 16 calculation procedures (up to 2-hour ratings)
Method B: Legacy Method calculations (up to 1-hour ratings)
Design tables for minimum glulam dimensions at 100% capacity
Specification requirements for fire-rated beam layups
Fastener and connection protection details
Worked examples for beam and column fire resistance design
Published by APA — The Engineered Wood Association.
