Abstract. Extreme events, both natural and man-made, have become more frequent. Explosions, falling or impact of bodies influence buildings and structures causing occurrence of high intensity inertia forces. Due to dynamic nature of the mentioned impacts they are to be considered in design calculations. The paper studies behavior of oblique sections of reinforced concrete (RC) beams under transverse dynamic loading; it describes the potential of using yielding supports, presented as inserted elements with ring cross-section. Experimental study included tests of 24 RC beams under shortterm dynamic impact of falling weight (265 kg). The behavior of RC beams was analyzed by measuring deformation of reinforcement and concrete, the value of supports reaction and impulse acting on a structure. The paper considers separate and joint effect of yielding supports and longitudinal compression on strength and deformability of RC beams. Longitudinal compressive force and yielding supports are proved to influence significantly the stress-strain state of oblique sections of RC beams under dynamic loading. Time of deformation is significantly prolonged in case of extended plastic component in yielding supports.