Use of the standing wave method to study seismically insulated buildings

Resumo

The use of the standing wave method to study seismically insulated buildings is substantiated. For two buildings of interest with different types of seismic protection (a “flexible” floor and rubber base insulators), the total field of standing waves is studied in detail. Effects that raise doubts about the reliability of seismic protection are found. Estimation of the role of nonlinear vibrations in standing waves has made it possible to establish that weak nonlinearity is recorded at high-frequency modes at small vibration amplitudes, due to discordant vibrations of the building components. The data obtained by the standing wave method are recommended for verifying models used to calculate seismic insulation of buildings.