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


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: Wood structures | Structural safety | Structural reliability | Load and resistance factor design | Allowable stress design | Wood construction | Stress distribution | Terminology and definition | North Dakota | United States

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