Comparison of Siesmic Performance of Different Irregular High Rise Structures with RCC and CFST Columns

The majority of building structures in underdeveloped countries like India are low-rise buildings. However, the lack of available land and the quickening rate of population growth create a need for vertical growth. “Medium-high rise” structures have become a feasible solution in answer to this need. There are many factors to take into account while creating high-rise structures, and composite materials have benefits like increased strength, improved aesthetics, and environmental sustainability. In a seismic zone of 3 (comprising G+30 storeys), this thesis compares irregular constructions built of steel, composite materials, and reinforced cement concrete. The research employs response spectrum analysis, a dynamic analytical method, on three building categories with distinct irregularities. The Etabs software is utilized for this purpose, comparing results such as time period, storey displacement, storey drift, maximum storey stiffness, and maximum storey shear. The study also explores construction options for irregular high-rise buildings, specifically focusing on steel-concrete-composite and RCC (Reinforced Cement Concrete), evaluating their characteristics. The equivalent linear dynamic analysis method in E-tabs version 13 software is applied, comparing results for various parameters, including base shear, storey drifts, axial forces, and bending moments for columns and beams at different levels. The findings indicate that steel-concrete-composite buildings are deemed safer, more economical, and a preferable option. The research utilizes the commercial software package E-tabs 2013 to analyse G+30 high-rise buildings with different irregular structures one constructed with composite steel-concrete material and the other with RCC situated in earthquake zone III with medium soil conditions. The study also involves analysing an irregular RCC structure by replacing traditional concrete with high-performance concrete. The behaviour of these structures under dynamic loads is examined, aiming to optimize the design of structural members, specifically columns, and minimize the quantity of materials through the use composite members instead of RCC members. The conclusion is drawn based on the analysis and comparison tables, offering insights into the most effective structural solutions.