Abstract
Magnetorheological (MR) damper is one semi-active device that shows a great potential for vibration suppression and hazard mitigation of civil structures. The damper utilizes special characteristics of the MR fluid that possesses magnetically controllable yield strength and can reversibly change from free-flow to semisolid in milliseconds. This semi-active damper is more effective than passive dampers in reducing the seismic response of flexible structures with a dominant natural period of 1.5 sec or more. This chapter investigates the effectiveness of MR damper for seismic protection of base-isolated structure. The damper is commanded by an inverse Bouc–Wen model together with a linear quadratic regulator (LQR) algorithm. An elevated highway bridge modeled as a two-degree-of-freedom system is used to describe the effectiveness of MR damper in protecting the bridge under three different ground excitations—the El Centro, the Northridge, and the Kobe earthquake. The results show that the MR damper can effectively reduce the deck response and the drift between the deck and the pier without significantly increase the pier response.
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