Enhancing Seismic Resilience of a Nine-Storey Composite Column Building Through Base Isolation Techniques: A Comparative Analysis

Abstract

Earthquakes pose significant threats to both human lives and structures, necessitating thorough dynamic analysis for earthquake-prone buildings. Such analyses are crucial for designing earthquakeresistant structures that can withstand seismic forces. One effective strategy employed to mitigate the destructive effects of earthquakes is the implementation of base isolation techniques. Base isolation involves the installation of isolators and energy-absorbing devices beneath the building's superstructure, aiming to provide structural safety and enhance the protection of occupants and assets within the building. Seismic isolation systems can be modelled using various structural analysis software, employing either nonlinear or equivalent linear properties to simulate the behaviour of isolators. In this particular study, we analyze a nine-Storey composite column building (G+9) located in seismic Zone V, employing the guidelines outlined in the IS 1893:2016 Code and utilizing SAP 2000 Software. The analysis focuses on two base isolation systems: the Rubber Bearing Isolation System and the Friction Pendulum System. Key seismic parameters such as storey displacement, storey drift, base shear, and time period frequency are evaluated and compared between the base-isolated models and the fixed base building. The results of our analysis indicate that base isolation systems lead to an increase in base shear values when compared to the fixed base building model. This study primarily examines the earthquake response of a building with base isolation through time hiStorey analysis. Its overarching objective is to minimize Storey displacement and Storey drift caused by ground excitation during earthquakes. This is achieved by installing base isolation devices (base isolators) at the foundation level, and the study aims to establish a comparative assessment of performance between the fixed base condition and the base-isolated condition