Passive control of structures – the dynamic case

Lately, powerful earthquakes stroke some parts of the world, while the Balkan peninsula was hit by moderate ones. During a powerful earthquake, a building structure is invaded by an enormous quantity of kinetic energy . From the manner this energy is, first absorbed, then dissipated throughout building structure depends, not only the reaction of structure as a whole, or structural elements in particular, but the nature, the distribution and the quantity of the damages also. As Nikola Tesla once quoted: “If you want to find the secrets of universe, think in terms of energy, frequency and vibration”. In order to be able to achieve some degree of control, in structural engineering, the frequency is the fundamental parameter one must begin with. Passive control is actively implemented in the developed countries, whereas intensive laboratory examinations are underway the last two decades in the domain of semi-active and active structural control as well. This Paper deals with one of such: the seismic isolation. It represents a modest temptation in this direction. In the first 2019 conference paper, static case has been treated, whereas this paper treats the more general case – the dynamic response of a SDOF simple system