Abstract
Buckling strength of cruciform section steel plates in plastic range whose mechanical property in tension has plastic-flow is theoretically obtained. Shear modulus and flexural rigidity, both of which were derived previously by the author, are applied for the present problem. The result shows that a buckling mode exists which gives lower critical value than that of pure torsional buckling. Present theoretical study is compared with test results for miled steel already published by the author. Theoretical critical value fairly agree with test results. The predicted b/t ratio of the plate which buckles just at the onset of strain-hardening coinsides perfectly with the test result.
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