Features of the buildings' seismic isolation systems under strong seismic influences with predominant long periods

Real earthquake records differ from each other in a number of spectral parameters, the main one of which is the prevailing oscillations period. It usually varies over a wide range. This work is devoted to the study of the seismic isolation systems' sensitivity with a sliding foundation belt, kinematic supports and rubber-metal supports to the prevailing period of strong seismic impact. The studies were conducted on the example of a 5-story building with a rigid structural solution with seismic isolation in the foundation part. Seismic impact is presented as a synthesized accelerogram. The main attention is paid to the maximum movement of the building at the seismic isolating supports' top level, which in reality is limited based on the supports stability and (or) the utility networks safety in the building. The seismic reaction dynamic calculations' results of the systems under consideration are presented. It is shown that seismic isolation systems with an increase in the predominant period of seismic impact of 9-point intensity lose their advantage and the maximum displacement of the building with long-period influences becomes unacceptably large).