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Overview of Design Methods Allowable Stress Design or Working Stress Method

Overview of Design Methods Allowable Stress Design or Working Stress Method Factor of Safety= Allowable Stress -------------------------- Actual Stress NDS is based on the Allowable Stress Design Method

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Overview of Design Methods Allowable Stress Design or Working Stress Method

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  1. Overview of Design Methods • Allowable Stress Design or Working Stress Method • Factor of Safety= Allowable Stress • -------------------------- • Actual Stress • NDS is based on the Allowable Stress Design Method • (Which is primarily used in wood, masonry, steel, and concrete)

  2. Overview of Loads -Gravity and Lateral Loads • Gravity Loads • Dead Loads - Building Materials • Live Load- people • impact loads- percentage increase to live load • roof live loads- uniformly distributed • (loads imposed during construction and loads caused by • fire-fighting equipment) • (reroofing operations, HVAC installation and servicing) • snow loads- handled separately (uniformly distributed) • wind forces handled separately • special loads- hydrostatic uplift • temporary structures

  3. Lateral Loads • wind loads- uniformily distributed • seismic - horizontal loading • Lateral earth pressure • Load and Force Combinations (Text Sect. 2.16) • DL+FLL+RLL(or snow) • DL+FLL+WIND(OR SEISMIC) • DL+FLL+WIND+1/2 SNOW • DL+FLL+SNOW+1/2 WIND • DL+FLL+SNOW+SEISMIC • Notes: You either use roof live load or snow load, wind load • or seismic load, roof live loads are infrequent, roof live • loads is not combined with seismic or wind load

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