Seismic Analysis of Vertically Regular and Irregular Buildings with Shear Walls and RCC X-Bracing System

Abstract

AbstractThis study observed the performance of simple G+10 Structure without and with shear wall and RCC X-bracing system and the effect of vertical irregularity (stiffness irregularity) introduced at 3rd and 6th floors in high rise building (G+10). Seismic analysis is done for the (G+10) Structure by dynamic method (response spectrum analysis) using STAAD Pro. Twelve structures have been analysed in this study, wherein four of them are base models, i.e. Structure without stiffness irregularity and then stiffness irregularity is introduced at the 3rd floor in all four structures, totalling eight structures. Then stiffness irregularity is introduced on the 6th floor, making a total of twelve structures. The four base models in this study are Simple Structure, Structure with shear walls at corners, Structure with RCC X-bracings at corners and Structure with shear walls and RCC X-bracing at alternate corners. The results of the node displacement, base shear and storey drift are recorded. The results obtained from STAADPro concluded that storey with increased storey height at lower storey’s levels leads to more damage under seismic load, shear wall model is the most effective Structure and storey drift decreases to a minimum when irregular Structure is stiffened with the shear walls.KeywordsShear wallsRCC X-bracing systemStiffness irregularityResponse spectrum analysis