Parametric Study of Braced Mega Frames Core Tube Structural System With Different Materials

The braced mega frame-core tube (BMFCT) structure represents a cutting-edge seismic structural system tailored for super tall edifices exceeding 500 meters in height. Functioning as a dual lateral load-resisting framework, the BMFCT comprises an outer braced mega frame and an inner core tube. However, its response under wind loading remains inadequately elucidated. This research undertakes a comprehensive dynamic analysis of an existing 117-storey BMFCT structure, employing various material schemes for the exterior mega columns (MC) and mega X-braced(MB) systems, including reinforced concrete (C), steel(S), composite(CO), and concrete-filled steel tube (CT). Utilizing the Gust factor method for dynamic wind assessment and the response spectrum analysis (RSA) for seismic evaluation, as delineated by Indian Standard (IS) code provisions, we developed simplified models for each material scheme using ETABS software. The resultant dynamic analysis outcomes will be rigorously validated against IS standards. This study presents a comparative analysis of the different material schemes in terms of lateral load resistance encompassing parameters such as displacement, inter-storey drift, base shear, and overturning moment, while also considering factors related to cost. To aim to contribute to the optimized design and implementation of BMFCT structures in high-seismic and high-wind regions. Overall summary, CTMBCTMC stands out for its stability, durability, and economic viability. COMCCOMB offers superior seismic performance, SMCSMB provide better output under RSA due to light weight and also faster construction but not suitable for high wind prone area on other hand compare to CMCCMB offer better performance in both with lesser cost, while COMCCOMB and CTMBCTMC remains a durable option for long-term applications in high-seismic and high-wind regions.