Abstract
In this paper, a semi-active electromagnetic friction damper (SAEMFD) is proposed for control of peak dynamic response of seismic-excited structures. In the proposed SAEMFD device, the friction force between two sliding plates is regulated by controlling the normal force using an electromagnetic field across the damper. The friction force is proportional to the square of the current passing through solenoids attached to two friction plates and it can be operated using stand-by batteries. A control algorithm is proposed for the semi-active control of the friction damper using a simple static output. The effectiveness of the SAEMFD device and the control strategy in reducing the peak dynamic response of structures is investigated through an application to a 5-story base-isolated building subject to near-field earthquakes. Numerical results demonstrate that the proposed SAEMFD device and the control strategy are effective in reducing the peak drift of rubber-bearings of the base-isolated building subject to near-field earthquakes.
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