Wood Diaphragm Design Capacities in LRFD Format

by Thomas P. Cunningham, Jr., American Plywood Assoc, Tacoma, United States,

Document Type: Proceeding Paper

Part of: Structural Engineering in Natural Hazards Mitigation


Wood diaphragms (horizontal and vertical) have performed well in resisting and transferring lateral forces imposed by major wind and seismic events. Resilient (ductile) behavior of wood diaphragms stems from limits established in development of design capacities for allowable stress design (ASD). The same considerations apply to development of LRFD capacities in the interest of continuity in diaphragm design and performance. Diaphragm design capacities are generally limited by the capacity of the panel-to-framing connection. As the transition from ASD to LRFD was underway, a different approach was introduced for design of laterally loaded connections. This represents a change in reference for development of diaphragm design capacities. At the same time, major revisions of ASCE 7 -88 seismic provisions are under consideration. Background information on development of ASD diaphragm design capacities is reviewed prior to consideration of LRFD capacities for structural panel diaphragms.

Subject Headings: Allowable stress design | Wood | Diaphragms (structural) | Load and resistance factor design | Connections (structural) | Lateral loads | Seismic effects | Wood construction

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