Concrete Column Design by AASHO Specifications

by Hans H. Fickel, (M.ASCE), Chf. Struct. Engr.; VTN Inc., Coral Gables, FL,

Serial Information: Journal of the Structural Division, 1971, Vol. 97, Issue 4, Pg. 1187-1201

Document Type: Journal Paper


The AASHO specifications of concrete column design fail to ensure consistent and uniform results for the following two reasons: (1) The design methods for cracked and for uncracked sections yield dissimilar answers at their common boundary; and (2) it is left to the discretion of the designer to work with a modular ratio of either n = 10 or n = 20. A method is proposed by which the demonstrated inconsistencies can be eliminated and interaction diagrams are presented which permit the direct determination of reinforcing requirements for the most common column configuration including the case of bending about two axes. The proposed method is purely pragmatic, applies to working stress design only and is solely intended to offer a convenient means of obtaining uniform and consistent results within the framework of the current specifications.

Subject Headings: Concrete columns | Cracking | Domain boundary | Permits | Case studies | Bending (structural) | Concrete frames

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