Drgania belek z przegubami sprężystymi jako modelu belek ze szczelinami

A method for evaluation of eigenfrequencies of cracked beams is presented in the paper. The method is based on Timoshenko beam theory. The crack is replaced by an equivalent elastic hinge taking into consideration rotational inertia and shear deformations. Elastic hinge model is based on classical beam bending theory. Stiffness of the elastic hinge was determined for rectangular cross-section with one- and two-sided crack. Influence of crack localisation and depth on beam eigenfrequencies was analysed. The results were compared to the results obtained using NASTRAN for three prismatic beams.