Seismic response of dual eccentrically braced systems designed by Eurocode 8

The Authors consider dual structures constituted by eccentrically braced frames and moment-resisting frames and design these structures according to rules which are the natural extension of those proposed in Eurocode 8 for dual structures constituted by moment resisting frames and concentrically braced frames. The procedure considers that the dual eccentrically braced structures may be designed by means of a single value of the behaviour factor and that the lateral forces are distributed between the braced and moment resisting frames according to their lateral stiffness. The seismic response of these systems is obtained through dynamic analysis and examined to evaluate the effectiveness of the rules proposed for the application of the capacity design principles and the adequacy of the behavior factor considered for this structural typology.