SEISMIC RESPONSE EVALUATION OF BUILDING WITH VISCOUS AND VISCOELASTIC DAMPERS

Abstract

There is a great need for implementation of various earthquake mitigation techniques for effective control over the earthquake. The energy dissipation devices for dissipating earthquake energy needs to be studied in depth from view point of their efficiency in resisting earthquake forces. In this paper the performance of viscous and viscoelastic dampers are studied in detail. The seismic performances of these dampers are compared with normal bare frame building. Nonlinear modal time history analysis using Elcentro time history data was performed and parameters such as base shear, displacement time history at roof level, modal time period and maximum forces in outer and inner column are compared and presented. The modelling and analysis of building is done using SAP analysis package. The viscous and viscoelastic dampers are modeled by using nonlinear link element having property type dampers. The viscoelastic dampers are modeled as per Maxwell model of viscoelasticity. The properties of viscous dampers are calculated from shear storage modulus and shear loss modulus. The results obtained from analysis indicate efficient performance of viscous damper for resistance against maximum forces and control over displacement and base shear