Analiza pracy belek zginanych i równocześnie ścinanych utworzonych ze ściśniętego pakietu płaskowników

The aim of the paper is the theoretical determination of the relationship between force P and deflection f for beams. It has been shown that when the friction is present in the cases considered the three qualitatively different phases of beam loading and unloading may occur. In the later phases (second and third) flat iron bars in the bending beam slide one another resulting in the distinct decrease of flexural rigidity of the beam. It appears that the diagram P(f) forms the hysteresis loop. In the paper the area of the hysteresis loop has been also evaluated.