3 - Friction Dampers

Friction dampers are designed to have moving parts that will slide over each other during a strong earthquake. When the parts slide over each other, they create friction which uses some of the energy from the earthquake that goes into the building.

This is a Pall Friction Damper installed in the Webster Library of Concordia University in Montreal, Canada. The damper is connected to the centre of some cross-bracing.

The damper is made up from a set of steel plates, with slotted holes in them, and they are bolted together. At high enough forces, the plates can slide over each other creating friction. The plates are specially treated to increase the friction between them.


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from Bristol University