Which mechanism causes buckling in a reinforced concrete column subject to sustained axial load near its critical limit?

💡 Explanation

Under sustained critical axial load, creep in the concrete matrix causes a gradual increase in lateral deflection because the concrete slowly deforms under stress, amplifying initial imperfections and leading to buckling. Therefore creep-induced deflection amplification results, rather than cracking, expansion, or shear which require different load conditions.

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