Overview of Recent Projects Implementing Rotational Friction Dampers

Abstract eng:
A novel damper device based on the rotational friction hinge concept invented by the first author is described. The testing of steel structure with rotational friction dampers (RFDs) at a large-scale shake-table testing facility demonstrated the remarkable efficiency of the damping system for reducing the lateral displacements and interstory drifts. The initial T-shape configuration of the RFD has been further improved over the years. Commercial supply of RFDs with broad range of slip capacities is now provided by Damptech based in Denmark. The conventional seismic protective systems with friction dampers typically include chevron- or v-braces, but RFDs can be also implemented as component of base isolation systems. The paper presents several essential projects in different countries which demonstrate the worldwide acceptance of the RFD concept and form the basis for further research and development activities. Some of the presented damper applications are in new buildings, while others are designed for seismic upgrade of existing structures.

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