Fire-Resistance Design of Mass Timber and Connections per 2021 IBC
by John "Buddy" Showalter, P.E.
September 24, 2020 December 1, 2020; 11:00 AM - 1:00 PM Pacific Time
ICC Preferred Provider Course Number: 25430The 2021 International Building Code (IBC) contains new requirements for minimum fire-resistance ratings for mass timber elements used in new construction Types IV-A, IV-B and IV-C, whether exposed wood (where permitted) or protected with noncombustible materials. Noncombustible protection for mass timber in Types IV-A and IV-B construction serves to provide a portion of the fire resistance of individual elements. A designer can calculate the fire-resistance rating of a protected wood element by adding the fire-resistance rating of the unprotected heavy timber member to protection provided by a noncombustible material applied to exposed wood. The IBC also requires connections of columns and other primary structural members to be protected with materials that have the required fire-resistance rating. New code provisions provide two options for demonstrating compliance with this requirement for connections in Types IV-A, IV-B and IV-C construction: a testing option and a calculation option. A calculation method will be presented. Buddy Showalter is a Senior Staff Engineer with ICC's Product Development group – responsible for development of technical publications and education related to building codes and standards. He is also a member of the Editorial Board for STRUCTURE magazine, published jointly by NCSEA, ASCE/SEI, and CASE. Prior to joining ICC, Showalter spent 26 years with the American Wood Council. He is a graduate of Virginia Tech.
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