Wood Design for Architects: AIA Statement AIA ... - WoodWorks
Wood Design for Architects: AIA Statement AIA ... - WoodWorks
Wood Design for Architects: AIA Statement AIA ... - WoodWorks
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Adjustment FactorsCapacity +/- based on:• Duration of Load• Moisture• Temperature• Chemical Treatments(Found in the National <strong>Design</strong> Specification <strong>for</strong> <strong>Wood</strong>Construction (NDS) published by the American Forest &Paper Association)Load Duration Factor<strong>Wood</strong> capacity greater <strong>for</strong> short time loadingLOAD DURATIONLoad DurationTypical LoadsFactor - CDPermanent 0.9 Dead LoadTen years 1.0 Floor live loadTwo months 1.15 Snow loadSeven days 1.25 Construction loadTen minutes 16 1.6 Wind/EarthquakeImpact 2.0 VehiclesThese factors are applied to member capacity<strong>Design</strong> ConsiderationsEnd restraint conditions:• Simple span has 2 supports• Continuous has 3 or more supports• Cantilevered has 1 support• Supports may be beams, columns, walls…<strong>Design</strong> ConsiderationsLoading Conditions:• Uni<strong>for</strong>m: Dead load, Live loads, pounds per lineal feet (plf)xLSimpleContinuous• Point: Interior Columns, walls, pounds (lbs)CantileveredxL
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