BEHAVIOUR OF FLAT-SLAB IN TALL BUILDINGS ALONG WITH OUTRIGGER SYSTEM

Abstract: The rate of population extension is increasing gradually in urban areas, so to save space and accommodate more occupants’, tall structure construction is extensively adopted by the builders. In addition to that, flat slab system has also gained popularity because of its architectural and construction advantages in the business. As the building’s height rises, it should have a good lateral load resisting capacity to counter wind and earthquake load peril. However, flat slab system alone cannot counter the load and cannot directly be adopted in tall buildings because of its poor stiffness. Thus, to improve the performance of flat slab tall structures under wind and earthquake loads, an outrigger system is considered and a parametric analysis is performed in this study. It is mainly deliberated to observe the behavioural difference of flat slab system along with and without outrigger system by analysing the characteristics such as lateral displacement, base shear, drift, and stiffness. The study is carried out on a tall building with the ETABs models considering shear walls and braces as an outrigger system at different locations. In addition to that, the most optimum models are also compared with RC frame building.

Keywords: Flat-slab, Outrigger system, displacement, storey drift, base shear, Structural performance