Friction dampers for seismic control of Concordia University library building

A novel structural system has been used in the design of a reinforced concrete building. By incorporating friction damped steel bracing in the rigid concrete frames, the earthquake resistance is dramatically increased. The system combines the inherent strength and stiffness of a braced frame with the energy dissipation capacity of the friction devices. Quasi-static and non-linear time history dynamic analysis show the superior performance of the device-equipped building relative to other building systems. During a major earthquake, a large portion of the seismic energy is dissipated by the devices with no dependence on ductility, so the main structural elements remain elastic without damage. Furthermore, the new system, while assuring added safety to the occupants and reduced damage to the contents, offers the benefit of significant savings in the initial cost of construction.