Performance Evaluation of High-Rise RCC Tube-in-Tube and Multi-storey Framed Structure Subjected to Wind Forces

Rapid urbanization and limited space availability considerably influenced the high-rise building construction. High-rise buildings are vulnerable to wind excitations; hence to mitigate the effect of wind excitations, today’s world is progressing towards the adaptation of various new structural systems for high-rise building construction. Tube-in-tube structural system is one of them. This paper presents wind analysis of 36-sorey RCC tube-in-tube and multi-storey framed structure, using the force coefficient method as per IS 875: Part III-2015. ETABS software is used for the modelling and analysis of the structure considering various wind speeds of 39, 44, 50, and 55 m/s along with terrain categories of I, II, III, and IV. Based on the analysis results, it is found that with the increase in wind speed and terrain categories (from highly obstructed to exposed open terrains), the top storey displacement and inter-storey drift goes on increasing for both tube-in-tube as well as multi-storey framed structure, but the values are on the higher side in case of a multi-storey framed structure. It is also observed that the dimension of columns, required to keep the structure within serviceability limits, is approximately 20% higher for multi-storey framed structure as compared to the tube-in-tube structure. This has eventually resulted in a reduction of utility space in the case of the multi-storey framed structure. Thus, it can be concluded that under the effect of wind forces, the high-rise RCC tube-in-tube structure shows better performance as compared to a multi-storey framed structure.