A Comparative Study on Framing System (SMRF, IMRF And DUAL SYSTEM) of Multi-Storied (G+7) Residential Building for Different Zones in Bangladesh

Abstract

Moment Resisting Frames (MRFs) are extensively used structural systems in urban construction worldwide due to their superior performance in resisting lateral loads, including wind and seismic forces, while efficiently supporting vertical loads from structures. Conversely, reinforced concrete dual systems integrate the energy dissipating characteristics of MRFs with the high in-plane stiffness of shear walls. This combination enhances their ability to control lateral loads from wind and earthquakes, making them particularly suitable for high-rise buildings. This study investigates the structural performance of a (G+7) storied residential building across different regions in Bangladesh, using reinforced concrete Special Moment Resisting Frames (SMRFs) and dual systems comprising intermediate MRFs and special shear walls. The analysis was conducted using ETABS software, following the BNBC 2020 standards. Key structural parameters such as story displacement, story drift, story shear, and base shear were assessed to evaluate the structural performance. Additionally, a cost assessment was carried out to analyze cost efficiency and material requirements. The analysis revealed that the dual system can reduce wind-induced story displacement compared to SMRF. These results highlight the potential structural advantages and of dual systems, particularly in wind-prone areas, making them a feasible solution for high-rise residential buildings in such regions.