2 - Metallic Dampers
are usually made from steel. They are designed to deform
so much when the building vibrates during an earthquake that
they cannot return to their original shape. This permanent
deformation is called inelastic
deformation, and it uses some of the earthquake energy
which goes into building.
Try the IDEERS
Experiments to find out more about inelastic deformation.
There are different types of metallic damper. One type, the
X-shaped Plate Damper, is used where two
braces meet. As the building vibrates, the braces stretch
pulling and pushing the damper sideways and making it deform.