Abstract
Structural vibration control is categorized into passive control, active control and semi-active control. Semi-active control using a variable damper stabilizes building responses in an earthquake better than the conventional passive control and active control.
This paper used variable hydraulic damper and MR damper. The servo valve of variable hydraulic damper controls the oil flow between two rooms of the cylinder divided by the piston. MR damper changes its damping force by changing the magnetic field acting on the MR fluid according to an electric current. As the first step of the research, in order to evaluate the performance expected from the theoretical study, a dynamic loading test was conducted. Next, authors conducted experiment by the base-isolated specimen of two-degree-of-freedom structure. Finally, the damping performance and control characteristics of semi-active damper were verified.
