Estimation of Critical Buckling Moments in Slender Reinforced Concrete Beams


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Title: Estimation of Critical Buckling Moments in Slender Reinforced Concrete Beams

Author(s): P. Revathi and Devdas Menon

Publication: Structural Journal

Volume: 103

Issue: 2

Appears on pages(s): 296-303

Keywords: beams; buckling; reinforced concrete.

Date: 3/1/2006

At present, there are no recommendations in codes such as ACI 318 and BS 8110 to estimate the critical buckling moment in slender concrete beams. It is assumed that if the slenderness ratios of the beams are limited to the values prescribed by the codes, the failure moment of the beam will be dictated by flexure and not by buckling. Experimental studies carried out as part of the present study, however, show that the specified slenderness limits are not reliable, and failure by lateral instability can occur in slender beams designed according to the code. It is also shown that the existing formulations to predict critical buckling moments in beams, suggested by various researchers, grossly overestimate the capacities in the case of under-reinforced beams. In this paper, a modified formulation is proposed to predict theoretical buckling moment, and it is found to agree very closely with experimental results for both under-reinforced and over-reinforced beams.