The present paper presents the development of a theoretical model which describes the transverse dynamic behaviour of clamped-free beams with a crack located along their length. The model allows for the inclusion of the effects of masses, concentrated at the free end of the beams, and of axial loads (both in traction and compression), applied at the same free end. A program was developed and implemented in a micro PC-compatible computer in order to derive the natural frequencies of the cracked beams. Results were obtained for several straight steel beams with variable depth cracks at different locations along their length. The corresponding case-studies presented in this paper consider only the inclusion of different values of the axial loads applied at the free end of the beams. Results are presented both under table and graph format and are discussed.
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