Published Paper Details:

Base isolation, widely used in critical facilities such as hospitals, airports, nuclear power plants, and bridges to reduce the horizontal acceleration transmitted to the superstructure. It effectively decouples the superstructure and the foundation during earthquakes. Base Isolation significantly reduces base shear forces, inter storey drifts. Analysis is carried out to investigate the dynamic response of 16-storey regular and irregular buildings using E-tabs. The analysis compared dynamic responses with and without base isolation using Lead Rubber Bearing (LRB) systems. The effectiveness of base isolation was demonstrated by comparing storey drift, lateral displacement, base shear, and time period between fixed base and isolated base structures. Results showed that while lateral storey displacements at the first storey were higher for isolated buildings compared to fixed base buildings, the top storey experienced less displacement. Vertical irregular buildings with base isolation performed better than regular buildings, while those without base isolation showed poor dynamic responses. Base isolation reduced base shear in both X and Y directions, stabilizing the structure during earthquakes. Relative storey drift values were lower for base isolated buildings, and time periods were increased by about 3.03 seconds for 16-storey buildings, helping to mitigate severe earthquake accelerations. Maximum storey displacements increased with building height, but story drift and base shear values were reduced in higher stories, enhancing structure safety and stability against earthquakes. Overall, base isolation increased the time period of high-rise buildings to mitigate severe accelerations during earthquakes.