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Uploaded on Jun 27, 2011
The San Francisco General Hospital and Trauma Center Rebuild is being constructed using a base-isolated foundation, the most earthquake-resistant design known today. We will be the first hospital in San Francisco to have this type of foundation, allowing us to remain open and operational after an earthquake, able to care for current patients and treat disaster victims.
Rather than placing the hospital building directly into the ground, the foundation is a basin with 115 base isolators that are like rolling disks that the hospital rests upon. When the ground shakes the isolators can move 30 inches in any direction, greatly reducing any movement of the building. After an earthquake the building will be able to re-center itself. Although types of earthquakes vary greatly, the base-isolated foundation we are using has been successfully tested for an 8.0 magnitude quake.
The simulation provides an idea of how the building is designed to be able to move without damaging the structure.