SEISMIC RESPONSE COMPARISON OF DIFFERENT TALL BUILDING STRUCTURAL SYSTEMS

Abstract: In order to guarantee structural safety and functionality during earthquakes, tall buildings' seismic performance is crucial. Moment-Resisting Frames (MRF), Frame-Shear Wall Systems (perimeter and corner placements), Braced Frames, Outrigger Systems, and Tube-in-Tube Systems are the six structural configurations whose seismic response is examined in this study. Comparing their efficacy in terms of stiffness, base shear, lateral displacement, storey drift, and reinforcement need is the goal.
To ensure fair comparison, three-dimensional building models were created in ETABS utilizing consistent plan dimensions, member sizes, and material attributes. The Response Spectrum Method was used to apply seismic inputs in accordance with IS 1893 (Part 1): 2016. To assess seismic performance across systems, both linear static and dynamic evaluations were performed. Findings indicate that shear wall-based and core-reinforced systems such as Tube-in-Tube and Outrigger exhibit superior stiffness and reduced displacement. Braced frames provide moderate drift control, while moment-resisting frames are the most flexible, resulting in higher displacements. Column reinforcement demand varies significantly across systems, influenced by stiffness and force redistribution.
This study offers useful insights into the structural efficiency and seismic behavior of different systems, supporting informed decision-making in the design of tall buildings for earthquake-prone regions.

Keywords: Seismic performance, tall buildings, structural systems, Response Spectrum Method, lateral displacement, storey drift, reinforcement demand shear