Effect of soil interaction on the performance of liquid column dampers for seismic applications

Abstract

SUMMARY The eects of soil-structure interaction (SSI) while designing the liquid column damper (LCD) for seismic vibration control of structures have been presented in this study. The formulation for the input- output relation of aexible-base structure with attached LCD has been presented. The superstructure has been modelled by a single-degree-of-freedom (SDOF) system. The non-linearity in the orice damping of the LCD has been replaced by equivalent linear viscous damping by using equivalent lineariza- tion technique. The force-deformation relationships and damping characteristics of the foundation have been described by complex valued impedance functions. Through a numerical stochastic study in the frequency domain, the various aspects of SSI on the functioning of the LCD have been illustrated. A simpler approach for studying the LCD performance considering SSI, using an equivalent SDOF model for the soil-structure system available in literature by Wolf (Dynamic Soil-Structure Interaction. International Series in Civil Engineering and Engineering Mechanics. Prentice-Hall: Englewood Clis, NJ, 1985) has also been presented. Copyright ? 2005 John Wiley & Sons, Ltd.