A new seismic-isolation method uses the physics of rolling to create a simpler, lower-cost alternative with readily available materials: recycled tennis balls.
Earthquakes cannot be forecast, but engineers can prepare for them. Seismic-isolation systems built into the bases of certain buildings in high-risk areas, such as San Francisco’s City Hall, use complex structures of concrete, rubber and metal to reduce quake damage by absorbing the ground’s horizontal oscillations, like a car’s suspension does with vertical motion.
“Everyone plays tennis, and they don’t know what to do with the tennis balls after each game,” says ETH Zürich seismic engineer Michalis Vassiliou. For their modern take on rolling seismic isolation, detailed in Frontiers in Built Environment, the researchers injected cementlike mixes into hundreds of balls from nearby tennis clubs that had lost their bounce.
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