AF&PA’s 2005 Special Design Provisions for Wind and Seismic
(SDPWS) is a dual format, allowable stress design
(ASD) / load and resistance factor design (LRFD) specification,
developed as an ANSI consensus standard by AF&PA’s
Wood Design Standards Committee. In the 2006 International
Building Code (IBC), provisions of SDPWS are permitted
as an alternative to provisions in!BC Section 2305 (see
Seismic Requirements for Wood Building Design – Recent
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