Comparative study of dampers on a G+26 storey building subjected to lateral loading

Abstract

Due to increase in urbanisation, popularity of high-rise buildings has increased which are vulnerable to the wind and seismic loads. In the design of these structures, dampers are proven to be effective in resisting the effect of lateral loads. In this paper, a realistic G+26 storey RCC building is modelled and analysed. Structure under observation is unsymmetrical which induces torsional moments and in order to avoid that shear walls are added along with dampers. The structural response of the building is compared using pall friction damper (PFD), lead rubber bearing (LRB) base isolators, and fluid viscous dampers (FVD) as a viable energy dissipating system. PFD and FVD are provided on the corners of the structure and LRB is provided at the base. The overall performance of the aforementioned structure is simulated by carrying out response spectrum analysis in seismic zone V, using ETABS. Further, stability of the structure is studied for Kobe and El Centro earthquakes by performing time history analysis. Base shear calculated by the analytical formula is 2512.7 kN which is in acceptance with the simulated model i.e. 2538.84 kN. It is observed that design parameters of FVD and PFD varies with ground motion frequency and variation of inter storey drift is least for LRB. In addition, the structural response of the PFD for the Kobe earthquake is lower than that of the others in terms of displacement and stiffness.