STUDY THE PERFORMANCE OF OUTRIGGER SYSTEM UNDER SEISMIC LOADS

Civil Engineering

High-rise structures in high seismic zones are subjected to earthquake forces, where the building performance is weakest in storey displacement and storey drift. Many researches have adopted various techniques to improve the performance of high rise building. These techniques include provision of core shear wall, bracing systems, dampers etc. these techniques are able to reduce storey displacement to some extent, but the storey drift is the constraint was the performance of building weakens. This constraint makes the research work to adopt the technique of outrigger as an ancient technique used to reduce the vibration of structure under seismic shake. The outrigger location and depth plays important role in performance of building. In this paper, a study of (G+50) structure with soft storey incorporated with outriggers is carried out. Modelling and analysis of structure is carried out in ETABs software to investigate the performance of RC structure under seismic loads. The effect of outrigger location has been studied to find out the best suited location of outrigger resisting lateral loads. It is observed that outrigger structural system along with the core system reduces storey displacement up to some extent, but helps to reduce storey drift within the limit.

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