Experimental evaluation of dual frame structures with thin-walled steel panels

Steel plate shear walls (SPSW) are efficient structural systems for resisting lateral loads owing to their high initial stiffness and stable cyclic behavior in the plastic range. The seismic response may be improved by connecting plate walls through link beams. Beam-to-column connections may range from simple connections to full rigid moment resisting connections. Given that initial stiffness is provided mainly by the platesʹ rigidity, simple connections between horizontal and vertical boundary elements can be employed. Rigid, but expensive, connections may prove more beneficial than simple ones by increasing the frame capacity and also reducing residual drift after an earthquake. The more cost-effective semi-rigid connections between these members are also expected to increase capacity and reduce residual drift in comparison to simple connections. This study investigates the behavior of dual steel frames with thin walled steel shear walls and link beams. Four half-scale specimens were tested under monotonic and cyclic loading for characterizing energy dissipation and evaluating seismic behavior factors. The specimens exhibited good, stable behavior. The rigid beam-to-column connections, when compared to the semi-rigid ones, improved the ultimate capacity and dissipated energy. The experimental program provides a basis for validating a numerical model of slender SPSW.