LRFD vs. ASD for Wood Structures

by David G. Pollock, (M.ASCE), American Forest & Paper Assoc, Washington, United States,
Thomas G. Williamson, (F.ASCE), American Forest & Paper Assoc, Washington, United States,



Document Type: Proceeding Paper

Part of: Spatial, Lattice and Tension Structures

Abstract:

There is a growing preference within the structural engineering community for the adoption of reliability-based load and resistance factor design (LRFD) procedures in lieu of traditional allowable stress design (ASD) procedures. The LRFD format introduces new terminology and nomenclature, and provides a consistent methodology for quantitative assessment of structural safety and reliability. Comparisons of ASD and LRFD procedures for design of wood structures, based on provisions of the National Design Specification^(R) for Wood Construction (NDS^(R)) and the draft LRFD Specification for Engineered Wood Construction, indicate that required sizes of structural members and connections will change only slightly (? approximately 10%) with the adoption of new LRFD procedures.

Subject Headings: Load and resistance factor design | Wood structures | Structural reliability | Allowable stress design | Structural safety | Wood construction | Structural design

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