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1978 NDS / 1976 UBC

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Since I now have the 1976 UBC but not the 1978 NDS I would appreciate some help clarifying the following please:


When applying the modification factors to tabulated Fb, it appears that ‘CF’ (size effect factor) was applicable for Glulams as well as ‘CS’ (slenderness factor) per the UBC.

·         Is it true that ‘CF’ (size effect factor) was applicable for Glulams?

·         Is Fb’ = tabulated FbxCFxCS or least of tabulated FbxCF or tabulated FbxCS




Sharon Robertson, P.E.

Arcon Engineers


Tel: 858-503-7854

Fax: 858-503-7858