Inelasticity of Reinforced Concrete and Structural Standards

by M. Z. Cohn, (F.ASCE), Prof. of Civ. Engrg.; Univ. of Waterloo, Waterloo, Ontario, Canada,

Serial Information: Journal of the Structural Division, 1979, Vol. 105, Issue 11, Pg. 2221-2241

Document Type: Journal Paper

Abstract: Structural standards recognize the inelastic behavior of reinforced concrete sections but ignore the inelastic structural action in all but some arbitrary moment redistribution provisions. The paper documents the rational and practical inadequacies of this situation by reference to recognized basic design criteria. Adoption of consistent inelastic design approaches is advocated and features of two classes of methods, i.e., compatibility and equilibrium are reviewed, in order to point out the possibility of accurate inelastic analysis and direct design, respectively. Potential features of these groups of methods are illustrated on a number of typical structures investigated in the literature for which the indices of serviceability, ultimate safety, and efficiency (steel consumption) are compared. It is concluded that sizable practical benefits may be obtained for thse types of structures with minimum extra effort versus the conventional linear elastic design.

Subject Headings: Inelasticity | Reinforced concrete | Concrete structures | Structural behavior | Steel structures | Structural safety | Arbitration |

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