Seismic Analysis of High Rise RCC Building Structure with Steel Outriggers and Belt Truss System

Abstract

The outrigger and belt truss system is one of the effective systems used to control lateral displacement occurring due to small or medium lateral forces like wind or earthquake. This system minimizes the risk of damage to structural and nonstructural members. This research focuses on effective use of outriggers and belt truss system for high-rise RCC building structure subjected to seismic forces. For the analysis, G+40 storey highrise RCC building with location in seismic zone V is considered. Outriggers are provided at different positions along the height of building keeping equal spacing and by providing X and V types of bracing systems. The modeling and analysis of RCC building provided with 3, 4 and 5 outriggers are separately carried out using finite element-based software (ETABS) following guidelines of revised IS: 1893 (Part 1)- 2016. In all, seven models are prepared considering the outrigger locations, type of bracing systems and responses namely displacement, storey drift and base shear. The results indicate that lateral displacement and maximum storey drift gets reduced by 39.44% and 36.33% respectively compared to conventional building when X-type bracing outriggers are used.