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The cri tical shear stresscs werc dete rmined for five elastic, simply supporled sq ua rc plates with central circular holes of diam eter one-eight and one-fourth the length of a s id e. Comparison of t he Jlumeri cal res ul ts obtained with those computed for plates without holes sho\\'s t hat, although an unreinforccd hole may cause a large r eduction in t he cr itical shcar st ress of the p la te, rein fo rcement of the hole by a circu lar doubler plate causes a substantial increase in the shear buck li ng load.

Instability in shear of simply supported square plates with reinforced hole