Earthquake behaviour of reinforced concrete buildings with metallic dampers

Among the passive energy dissipation systems, one of the most used types is the metallic dampers such as Added Damping and Stiffness (ADAS) elements. In this study, the performance of reinforced concrete structures, which are regular in shape and symmetrical in plan, equipped with ADAS dampers in inverted V- bracing systems were investigated. For this, 6, 9 and 12 storey framed structures having three bays were used. The structural behaviours of the studied frames were determined by conducting the nonlinear static and time history analysis. A group of natural earthquake acceleration records compatible with seismic hazard levels of 2%, 10%, and 50% probabilities of exceedance in 50 years was utilized in the dynamic analysis. The results of the analysis in terms of the capacity curves of the structures, maximum storey displacement and interstorey drift demands, displacement time history, hysteretic behaviour, and plastic hinge formation were evaluated. The results exhibited that the ADAS dampers in inverted V bracing systems were effective in earthquake energy dissipation as observed in the behavior of the frames in the elastic region under the earthquakes compatible with the seismic hazard of 10% and 50% probability of exceedance in 50 years. Keywords: Damper, Frame, Nonlinear analysis, Seismic behaviour, Seismic protection.