Optimal sliding force characteristics of friction dampers for seismic response control of building structures considering sway-rocking motion
Kazutaka Shirai, Junta Horii, T. Fujimori
Abstract
This study aimed to understand the optimal characteristics of friction dampers considering sway-rocking (SR) motion in vibration control structures during earthquakes. The nonlinear seismic response was numerically obtained using a six-story reinforced-concrete building model with a friction damper and SR springs and damping elements. The results indicate that the SR case shows a less sensitive response change with increased damper sliding force and shows a higher optimal damper sliding force, compared with the fixed-base (FB) case. Moreover, a reversal phenomenon may occur in the response curve for the average peak story drift against the sliding force between the FB and SR cases. This response reversal phenomenon was further analyzed using experimental data from shake table testing using a specimen with a friction device supported by a SR mechanism. This study contributes to damper optimization and effective design for friction-damped structures considering soil-structure interactions.