Ariel University Center of Samaria, Israel, Department of Civil Engineering


Supplemental dampers are known as efficient devices for improving structural seismic response. Viscous, friction, yielding steel and other dampers were developed in the last decades for this reason. These devices are used in modern structures and in retrofitted buildings all over the world. This paper is focused on investigating a damping system including viscous and variable friction dampers. Numerical analysis of a multi-story sceleton structure with masonry infill walls was carried out. At the first stage the structure was provided by optimal viscous dampers and its response to a white noise was obtained. According to this response, appropriate parameters of variable friction dampers were obtained using an equivalent energy dissipation hypothesis. At the second stage dynamic response of the structure under real seismic motions was studied. It was shown that using a hybrid damping system including viscous and variable friction dampers yields essential improvement in structural response and looks attractive for practical implementations.

Key words
earthquake action, masonry infill walls, variable friction damper, dynamic response, forcedisplacement characteristic