Design of an Integrated Model for Parametric Material Assessment of Braced Mega Frame Core Tube Systems in Super Tall Buildings

Braced mega frame–core tube (BMFCT) systems are widely used beyond 500 m, but their behavior under material substitution and Indian code–governed dynamic loading is poorly understood. Brace patterns, stiffness ratios, and collapse mechanisms are often studied using Chinese or performance-based frameworks, ignoring wind–seismic interaction, Indian Standard validation, and systematic exterior material scheme comparison. Thus, BMFCT material selection advice is fragmented and experience-based. Mega columns and mega Xbracing on a 117-storey BMFCT prototype are parametrically assessed against reinforced concrete, structural steel, composite sections, and concrete-filled steel tubes as exterior solutions. In compliance with IS 875 (Part 3) and IS 1893:2016 and IS 16700:2023, ETABS produced simplified yet mechanically faithful three-dimensional models and evaluated lateral reaction using the Gust Factor method for wind loading and reaction Spectrum Analysis for seismic action. Displacement profiles, inter-storey drift ratios, base shear demand, overturning moment, and indicative material cost indices were interactive response patterns along building height sets. CFST members' composite confinement effect and improved axial–flexural coupling may explain why the concrete-filled steel tube configuration (CTMBCTMC) reduces drift buildup and overturning amplification while maintaining stiffness-to-weight balance. Composite mega frames (COMCCOMB) mitigate seismic deformation best, although top zones are wind-sensitive. Steel systems (SMCSMB) aid construction speed and mass reduction but are windy. Increased displacement, threatening cyclone-exposed region serviceability.