Theoretical and experimental studies of seismic protection systems with switchable connections

To reduce the amplitudes of accelerations under high-frequency impacts and the amplitudes of displacements under low-frequency vibrations, the principle of paired columns was applied in the work, which were calculated beyond the limits of elasticity. At the beginning, the internal columns only support bending moments and axial forces. When the movement increases, the external columns are included in the work. Expanding units and burst-type dampers are installed in the gaps between the internal and external columns.