Abstract
A general procedure is presented for the nonlinear analysis of the forced response of structural
elements to harmonic excitations. Internal resonances (i.e., modal interactions) arc taken into
account. All excitations arc considered, with special consideration given to resonant excitations. The
general procedure is applied to clamped-hinged beams. The results reveal that exciting a higher
mode may lead to a larger response in a lower interacting mode, contrary to the results of linear
analyses.
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