SEMI-ACTIVE CONTROL FOR BASE ISOLATION SYSTEM WITH HARDENING OF LAMINATED RUBBER BEARINGS

Under extreme ground motions, such as long-period ground motion and pulse-like ground motion, laminated rubber bearings can be subjected to large shear deformation. In the case of their shear strain beyond 250%, they can exhibit hardening behavior. This study verified the effectiveness of semi-active control using an MR damper applied to base isolation systems with the hardening of laminated rubber bearings. Moreover, the dual real-time hybrid (DRTH) simulation was conducted to evaluate the semi-active control performance. DRTH simulation is a seismic response simulation method with a combination of numerical computation and physical testing of two specimens by excitation devices.