BUCKLING RESPONSE AND ELASTIC STIFFNESS OF BUTTERFLY DAMPERS

The utilization of energy dissipative devices represents a common strategy to protect structures against seismic excitations. Among the most used hysteretic damper types, butterfly dampers have been widely investigated as a profitable protection technology able to provide large energy dissipation capacity, with the possibility of easily controlling both stiffness and strength (Figure 1). The effect of altering the geometry of steel strips on the low-cycle-fatigue (LCF) resistance and ductility of yielding dampers has been a subject of interest of many researchers worldwide during the past decade (Ghabraie et al., 2010; Deng, et al., 2014, Hedayat, 2015). Although the results suggest that it may be possible to provide more uniform plastic strain distribution along the yielding devices such as butterfly dampers by changing the edge shapes; however, removing materials from the original butterfly dampers could have significant effect on the buckling response and elastic stiffness of butterfly dampers.

کلیدواژه ها:

Buckling ، Finite element model updating ، Butterfly damper ، yielding device