Assesment of Seismic Parameters in Reinforced Concrete Tall Structures Utilizing Shear Cores, Shear Walls and Shear Cores with Outriggers

Abstract

The increasing demand for vertical development in urban areas has led to a growing need for tall buildings that are both efficient and safe under lateral loads such as wind and earthquakes. As buildings rise in height, their vulnerability to lateral forces becomes a significant concern in structural design. Engineers adopt different structural systems to strengthen buildings and limit lateral movement during seismic or wind events. This study focuses on evaluating and comparing the seismic performance of a G+30 reinforced concrete (RC) building using different structural configurations, including a moment-resisting frame, corner shear walls, a central shear core, and outrigger systems. The building models were developed in ETABS 2021 and analysed under seismic Zone IV conditions following IS 1893 (Part 1): 2016. Two methods-Equivalent Static Analysis method and Response Spectrum Analysis method were used to examine key performance parameters such as storey displacement, base shear, inter-storey drift, and storey shear. Five structural cases were studied to observe how different arrangements affect the distribution of seismic forces and the overall behavior of the structure. Among all configurations, the model with a central shear core combined with double outriggers exhibited the most favorable results, showing significant reductions in lateral displacement and storey shear. The results clearly indicate that the inclusion of outriggers enhances lateral stiffness and improves seismic performance, making them a reliable choice for high-rise structures situated in earthquake-prone areas. This comparative study aims to assist structural designers in selecting suitable lateral systems during the planning and analysis of tall RC buildings