Semi-Active Control of Seismically Excited Hysteretic Structures Using Variable Viscous Dampers

摘要

This paper describes the application of a semi-active variable viscous (SAVV) damper for reducing the response of a seismically excited hysteretic structure. Two algorithms for selecting the damping properties of the SAVV damper were used: the Linear Quadratic Regulator (LQR) and the Sliding Mode Control (SMC) algorithms. Both were formulated based on full-state feedback and static output feedback, with or without an observer. The equations of motion were formulated in the state-space and in the drift (inter-story) coordinate system. An eight-story shear building with a seismic isolation system supplemented with a SAVV was analyzed using the selected control algorithms and subjected to a strong earthquake. The results of the various analyses indicate that variable dampers can effectively reduce both the displacement and acceleration responses, and consequently, the story and base shears of both linear and hysteretic structures