Enhancing Seismic Resilience of a Nine-StoreyComposite Column Building Through Base Isolation Techniques: A Comparative Analysis
Abstract
Abstract
Earthquakes pose significant threats to both human lives and structures, necessitating thoroughdynamic analysis for earthquake-prone buildings. Such analyses are crucial for designing earthquake-
resistant structures that can withstand seismic forces. One effective strategy employed to mitigate thedestructive 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.