Evaluation of Effective Location of Pendulum Tunned Mass Dampers for Building with Mass Irregularity

Abstract

The building may have the stiffness irregularity due to some unavoidable circumstances. While doing the seismic retrofitting of such buildings the location of dampers plays a vital role. The stiffness irregularity may be categorized as vertical or horizontal. The stiffness irregularity may rise due to unsymmetrical location of shear wall or similar stiff element, such irregularity is called as irregularity in plan. The dampers can be located towards the stiffened side of building or may be located away from the stiffened side. In this paper a G+20 building frame having stiffness irregularity in plan is selected and it seismic resistance is evaluated for three different location of PTMD. The mass ratio of was kept equal to 0.03. The Nonlinear modal time history analysis was performed using finite element software SAP. The performance parameters such as displacement, storey drift and maximum forces are compared and presented. The pendulum damper is modeled using nonlinear link element. The results indicates that along the axis where the building is symmetrical in plan the location away from the stiff element proves to be efficient location where as in other direction the damper located at centroid of building is more efficient.