Analytical assessment of reinforced concrete frames equipped with TADAS dampers

In recent years, it is considerably attempted to develop the concept of energy dissipation as an applicable technology to overcome the energy released by earthquakes. The passive control systems such as metallic dampers have been widely considered. The dampers are basically used to mitigate the structural responses and reduce the damages in main structural elements by energy dissipation. The present paper is aimed to evaluate the seismic behavior of three conventional concrete moment resisting frames having 4, 7 and 10 stories incorporating seismic strength imperfection equipped with Triangular Added Damping and Stiffness (TADAS) metallic dampers. OpenSees and nonlinear time-history analysis incorporating seven seismic records have been used to define the frame response. The results revealed that the seismic response of retrofitted frames has been considerably improved. Where, the drift of the stories have been constant and the maximum values in retrofitted 4, 7 and 10 story frames have been decreased 54%, 56% and 55%, respectively. Also, the maximum roof displacement, the maximum floor acceleration, the maximum story shears have been declined in damper equipped frames and the seismic performance of the most retrofitted frame elements has been upgraded to Immediate Occupancy (IO) and Live Saftey (LS) performance level.