Hysteretic force-deflection curves of a single-story laboratory structure made of mild structural steel were obtained experimentally for both static and dynamic loading conditions. The dynamic loading consisted of a sinusoidal force at about 3 cps applied to the roof of the structure. Maximum fiber strains up to 9 times the yield strain were realized. A strain softening type of modification of the steel was observed during the experiments with subsequent strain ageing occurring between experiments. Differences between static and dynamic hysteretic force-deflection curves were found to be smaller than changes in the static curves caused by the material modifications during repeated loading.
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Robert D. Hansen (1966) studied this question.