values of the amplitudes were the same. In the latter, the differences in the vibration character may have been caused by the geometrical imperfections of the real model or the imperfections in carrying out the measurements. The theoretical results were verified experimentally, thus proving that the theoretical analysis was carried out correctly. It may therefore be maintained that the phenomenon of parametric resonance is a real danger in tall buildings secured against the negative effects of earthquakes with a TMD in the form of pendulum.