Abstract
In this work free vibration analysis is performed for multi-delaminated composite beam-columns subjected to axial compression load. In order to investigate the effects of multi-delaminations on the natural frequency and the elastic buckling load of multi-delaminated beam-columns, the general kinematic continuity conditions are derived from the assumption of constant slope and curvature at the multi-delamination tip. The characteristic equation of multi-delaminated beam-column is obtained by dividing the global multi-delaminated beam-columns into segments and by imposing recurrence relation from the continuity conditions on each sub-beam-column. The natural frequency and the elastic buckling load for multi-delaminated beam-columns are obtained in this work. The latter is based on the incremental load of axial compression, which is limited to the maximum elastic buckling load of the sound laminated beam-column. To verify the results of the present models, experimental results are obtained for isotropic single delaminated beam-columns. Comparisons are conducted between these experimental results and the present analysis. Good agreement is obtained from this comparison of results. It is found that the sizes, locations and numbers of multi-delaminations have significant effect on the natural frequency and the elastic buckling load, specifically the latter ones.
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