A spectral element approach to determine the nonideal or unknown structural boundary conditions of beams is introduced. The nonideal structural boundary conditions are represented by the frequency-dependent effective boundary springs transverse springs: transverse springs and rotational springs. The effective boundary spring constants are then determined from the measured frequency response functions in conjunction with the spectral element method. Experiments are conducted for the one-end-supported and the two-end-supported beams to verify the present approach of boundary conditions identification. The analytical predictions obtained by using the identified boundary conditions are very close to the experiment measurements.
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