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The paper presents method of calculation of eigenfrequencies of the cracked reinforced concrete beams including discreet model of crack. The described method is based on the stiff finite elements method. It was modified in such a way as to take into account local discontinuities – cracks. In addition, some theoretical studies as well as experimental tests of concrete mechanics based on discrete crack model were taken into consideration. The calculations were performed using the author's own numerical algorithm. Moreover, other calculation methods of dynamic reinforced concrete beams presented in standards and guidelines are discussed. Calculations performed by using different methods are compared with the results obtained in experimental tests.

EIGENFREQUENCIES OF THE REINFORCED CONCRETE BEAMS – METHODS OF CALCULATIONS / GELŽBETONINIŲ SIJŲ TIKRINIAI DAŽNIAI – SKAIČIAVIMO METODAI