Friction pendulums are a different kind of isolator. They rely on the movement of two elements relative to one another to permit the lateral movement of the structure and dissipate energy. They can be used for light and heavy structures, as their period depends only on the radius of curvature. They can also carry a high vertical load and can provide more than 30% damping. However, contrary to the previous types of isolators described, friction pendulums must be used at all locations in a structure.
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