Seismic performance of high-rise buildings with advanced lateral load resisting systems subjected to wind and earthquake loads

Abstract

High-rise buildings must withstand environmental forces such as wind and earthquakes to ensure occupant safety and structural stability. This research investigates the seismic performance of eight (G + 20) building models with different lateral load-resisting systems: a normal building (MD1), a core wall (MD2), a V-bracing frame (MD3), an inverted V-bracing frame (MD4), an X-bracing frame (MD5), an outer shear wall (MD6), an inner shear wall (MD7), and a concrete diagrid system (MD8). The study examines the seismic performance of these models using response spectrum and pushover analyses, focusing on the natural time, story displacement, base shear, story drift, overturning moment, performance point, and location of plastic hinges. ETABS. (2021). Structural and Earthquakes Engineering Software, Computers & Structures Inc. (Vision, 21.2.0). Berkeley University, California, USA.) software and Indian standard codes were used for structural analysis. The results revealed that the natural period ranges from 2.147 s in MD1 to 1.599 s in MD7, representing 25.5% difference in stiffness. MD6, which is slightly less stiff than MD7, is preferred for cost savings. MD3 has the highest base shear (6406.6 kN), while MD6 has the lowest base shear (4718.4 kN), representing 26.3% stiffness variation. Compared with MD1, the story displacement of MD6 is 40.0% less because of practical outer shear wall elements. All models met the IS 1893 Part 1: 2016 (Indian Standard, criteria for earthquake resistant design of structures - Part 1: General provisions and buildings, 2017) criteria for permissible story drift. Compared with MD1, MD8 reduces the story drift by 66.2% and has the lowest overturning moment, which is 85.2% less than that of MD2. Pushover analysis revealed that all the models met the safety criteria, although MD5 had a hinge exceeding the E-state, and MD8 had some hinges in the LS-CP and C-D states. Despite these issues, MD5 and MD8 maintain strength in vital load-bearing elements.