I am trying to determine a suitable wood deck to be used for scaffold access. The required factor of safety for scaffolding components is 4:1 per OSHA 1926.451(a). Should the adjusted design value for bending (ie Fb') be divided by 4 to get an allowable stress to compare to the actual stress? Does the adjusted design value (Fb') have a built-in factor of safety? I am having difficulty trying to determine what the wood's allowable stress value actually is due to the fact that it is not clear in the NDS Manual. If Fb' is an ultimate value for bending stress, would this also apply to the other adjusted design values (ie Fc', Fv', Ft', etc.)?
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