Specializing in seismic upgrades of existing and historical structures
Seismic base isolation is a relatively new retrofitting technique that provides a structure flexibility to withstand the lateral forces during an earthquake. Base isolators act like large “motor mounts” when placed under a load-bearing column of a bridge or building and, during a seismic event, the isolators absorb the impact thereby greatly reducing the seismic forces transmitted through the building.
Sheedy has been instrumental on a number of key retrofit projects to include San Francisco’s City Hall, the largest structure in the world ever upgraded with seismic base isolators. Sheedy also installed led the largest friction-pendulum isolators at the time on the Benicia-Martinez Bridge.