TMD effectiveness in nonlinear RC structures subjected to near fault earthquakes

DOMIZIO MARTÍN; AMBROSINI, DANIEL; CURADELLI, OSCAR

SMART STRUCTURES AND SYSTEMS

TECHNO-PRESS

Año: 2019 vol. 24 p. 447 - 457

1738-1584

The use of Tuned mass dampers (TMD) has proved to be effective in reducing the effects of vibrations caused bywind loads and far-field seismic action. However, its effectiveness in controlling the dynamic response of structures under nearfaultearthquakes is still under discussion. In this case, the uncertainty about the TMD performance arises from the shortsignificant duration of near-fault ground motions. In this work, the TMD effectiveness for increasing the safety margin againstcollapse of structures subjected to near-fault earthquakes is investigated. In order to evaluate the TMD performance in theproposed scenario, the nonlinear dynamic response of two reinforced concrete (RC) frames was analyzed. TMDs with differentmass values were added to these structures, and a set of near-fault records with frequency content close to the fundamentalfrequency of the structure was employed. Through a series of nonlinear dynamic analysis, the minimum amplitude of eachseismic record that causes the structural collapse was found. By comparing this value, called collapse acceleration, for the caseof the structures with and without TMD, the benefit produced by the addition of the control device was established.