Seismic response of two-way asymmetric building installed with hybrid arrangement of dampers under bi-directional excitations

This article presents a comparative study of the linearly elastic, single-storey, two-way asymmetric system under bi-directional earthquake excitation. The comparative study includes the following dampers: linear and nonlinear fluid viscous dampers, semi-active friction damper and hybrid arrangement of fluid viscous dampers and semi-active friction damper. The response is obtained by numerically solving the governing equations of motion using state space method. The effect of power law coefficient, supplemental damping ratio, stiffness coefficient and gain multiplier on peak response which includes lateral, torsional displacement and acceleration are investigated. To study the effectiveness of dampers, the controlled response of asymmetric system is compared with the corresponding uncontrolled response. The parametric study indicated that the hybrid arrangement of damper is quite effective in reducing various responses. It is further observed that fluid viscous dampers are effective in reducing displacement response and semi-active friction dampers are effective in reducing acceleration response.