A STUDY ON BEHAVIOUR OF OUTRIGGER SYSTEM ON HIGH RISE STEEL STRUCTURE BY VARYING OUTRIGGER DEPTH

Abstract

The outrigger system is one of the most efficient system used for high rise structures to resist lateral forces. In the present study an attempt has been made to study the static and dynamic behavior of the outrigger structural system on steel structure by reducing the depth of outrigger.5X5 bay 40 story 3D steel structures is modeled in ETABS v2013 software. Steel structure with central core and steel structure with outrigger structural system of varied depth of outrigger are compared. The depth of the outrigger is reduced to 2/3 rd and 1/3 rd of the story height along with the full story height. The depth of the belt-truss is equal to the height of the typical story and maintained same in all the structures. The key parameters discussed in this paper include lateral deflection and storey drift. From the analysis results it has been found that the comparative performance of outrigger with depth of full storey height and decreased depth shows minor difference in resistance towards lateral loads.