Abstract
In this study, a series of shaking table tests were conducted using a specimen that consisted of a superstructure, incorporating a friction device and a sway-rocking mechanism under the superstructure to determine the optimal damper slip force of a passive vibration control system considering the effects of sway-rocking motion. The adopted simple friction device, composed of rubber bands and stainless steel plates, allowed the magnitude of the slip force to be easily set. The optimal slip force of the friction device, which minimizes the peak and root-mean-square response of the superstructure subjected to earthquakes, was determined from the shaking table tests. Based on the results, the optimal slip force of the friction device was found to vary according to the input level of the ground motions and the sway-rocking conditions. The obtained results suggest that the effect of sway-rocking motion should be considered in the design of passive control structures and the determination of their optimal damper slip force.
Highlights
Passive vibration control, achieved by incorporating supplemental devices such as friction dampers, is an effective approach for increasing energy absorption and reducing the dynamic response and damage of structures during earthquakes
Wu et al have conducted an experimental study on reparability of an infilled rocking wall frame structure with rotational and translational friction devices [9]
The following conclusions can be drawn: (1) For the shaking table tests, a simple friction device that allowed the magnitude of the slip force to be set was used to determine the optimal damper slip force that effectively minimized the peak and RMS responses
Summary
Passive vibration control, achieved by incorporating supplemental devices such as friction dampers, is an effective approach for increasing energy absorption and reducing the dynamic response and damage of structures during earthquakes. It is recognized that sway-rocking motion under structures affects the earthquake response of superstructures, a limited number of analytical and theoretical studies have investigated the optimal or effective damper characteristics of vibration control systems considering sway-rocking motion. Koya et al have assessed optimal damping characteristics of vibration control systems with Maxwell-type or hysteretic damper in consideration of sway-rocking motion [20, 21]. E objective of the present study is to experimentally determine the optimal slip force of friction-damped structures with sway-rocking motion. Conducting many shaking table tests and obtaining the corresponding responses under various conditions, such as various magnitudes of the friction damper force, were considered in the planning of the tests and specimen in order to obtain the optimal damper slip force for the vibration control system.
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