Abstract
An analytical method is developed for determining the buckling load of the longitudinal bars in reinforced concrete elements subjected to high axial loading and large compressive strains. The proposed model is comprised of a beam of infinite length on equidistant intermediate supports having equal stiffness. On account of the presence of the concrete core, the problem becomes one of unilateral instability. The length of the half-wave characterizing the buckled shape is obtained by studying the deflection curves satisfying the unilaterality condition. A general analytical formulation is given which solves the problem in a closed form, whatever the number of supports comprised in the half-wave. A comparison with experimental results by other researchers demonstrates the validity of the model proposed.
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