Structural Design concepts for responding to earthquakes include "seismic resistance," "seismic control," and "seismic isolation."
"Seismic isolation" is based on the concept of installing a seismic isolation device between a building and the ground to prevent earthquake shaking from being transmitted directly to the building. The process of making existing buildings seismically isolated is called ``seismic isolation retrofit.''
This method targets buildings with historical value and public facilities that would be difficult to relocate or construct new, creating seismically isolated buildings while maintaining their current functions, so it is important to use a temporary installation method that does not have a negative impact on existing buildings.
By inserting a thin jack between the seismic isolation device and the existing frame to deform the rubber beforehand and then transfer the load, we were able to minimize the impact on the existing building.