Abstract
It is well known that pseudo-velocity under-estimates the seismic response velocity if a long period structure is subjected to a ground motion with high frequency components. Whereas a velocity-dependent damper such as an oil-damper is affected by this effect, frequency dependency of the damper can be eliminated by generating the damping force relative to displacement by using a semi-active damper.
In this paper, a displacement dependent regulator for the semi-active damper is modeled by complex stiffness and the comparisons of the seismic responses of the base-isolation systems with the velocity- and displacement-dependent dampers illustrate the effectiveness of the displacement-dependent damper.
