COMPARING THE PERFORMANCE OF HIGH RISE BUILDINGS WITH AND WITHOUT COUTRIGGER STRUCTURAL SYSTEM UNDER LATERAL LOADING

Abstract

A comparative study of an outrigger structural system studied under the lateral loading on different buildings structural system. Obtained analysis reveals that placing outriggers at specific storeys can significantly impact the building's lateral displacement and stiffness under seismic and wind loads. The study emphasizes the role of outriggers in enhancing the overall stability and performance of tall buildings under lateral loading conditions, providing valuable insights. Analysis of lateral displacement under seismic and wind loads indicates that the maximum lateral displacement for a building without outriggers is higher compared to buildings with outriggers at specific heights, showcasing a reduction in lateral displacement with outriggers in place. Investigation into the percentage reduction in lateral displacement for buildings with concrete outriggers at different heights demonstrates varying levels of reduction, with outriggers positioned at optimal heights showing the highest reduction in lateral displacement under lateral loading conditions. In this research work I prepared four different cases in ETABS software. Outrigger structural system placed as a reinforced concrete element at different locations in an entire building of G+50 stories. They serve as a fixed base for the building from that particular floor and increase the overall stiffness studied under response spectrum analysis.