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<p>Building safety is seriously threatened by earthquakes, especially in seismically active areas. Conventional fixed-base designs frequently sustain significant damage during powerful seismic events, despite their primary goal of increasing structural strength. Base isolation is a passive control technique that helps improve the seismic performance of any structure. Among the passive controlled systems, the Lead Rubber Bearing (LRB) element is a Base Isolator device that helps mitigate seismic responses. The present study investigates the effectiveness of LRBs in mitigating seismic forces for reinforced concrete (RC) buildings of varying heights of G + 3, G + 5, and G + 8 models via parametric study using ETABS 2019 software. Through Response Spectrum Analysis (RSA) and Nonlinear Time History Analysis (NLTH), the study evaluates key seismic parameters, including base shear reduction, inter-story drift, displacements, and stiffness variations, under different ground motions of Whitter Narrows, Kobe, and Imperial Valley. The results demonstrate that LRBs significantly increase the natural period of structures, reducing base shear by 46–59% in RSA and 29–48% in NLTH, with the highest efficiency observed for low-rise buildings (G + 3). While isolator-level displacements increased, they remained within safe limits. Drift ratios stayed below 0.4% for the fixed base and 0.1% for the isolated base, ensuring compliance with IS 1893:2016. NLTH revealed motion-dependent performance, with near-field earthquakes inducing larger displacements but effectively protecting the superstructure. LRBs increase the time period and displacement while reducing the base shear and inter-storey drifts, making any building more seismically reliable. The study highlights LRBs as a robust passive control strategy for seismic resilience, particularly for mid- to low-rise buildings.</p>

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Seismic analysis of base isolated structures

  • 期刊论文

  • 发表日期：

    2025年9月25日

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  • Neelansh Yadav,
  • Govinda Jha,
  • Priyaranjan Pal

摘要

Building safety is seriously threatened by earthquakes, especially in seismically active areas. Conventional fixed-base designs frequently sustain significant damage during powerful seismic events, despite their primary goal of increasing structural strength. Base isolation is a passive control technique that helps improve the seismic performance of any structure. Among the passive controlled systems, the Lead Rubber Bearing (LRB) element is a Base Isolator device that helps mitigate seismic responses. The present study investigates the effectiveness of LRBs in mitigating seismic forces for reinforced concrete (RC) buildings of varying heights of G + 3, G + 5, and G + 8 models via parametric study using ETABS 2019 software. Through Response Spectrum Analysis (RSA) and Nonlinear Time History Analysis (NLTH), the study evaluates key seismic parameters, including base shear reduction, inter-story drift, displacements, and stiffness variations, under different ground motions of Whitter Narrows, Kobe, and Imperial Valley. The results demonstrate that LRBs significantly increase the natural period of structures, reducing base shear by 46–59% in RSA and 29–48% in NLTH, with the highest efficiency observed for low-rise buildings (G + 3). While isolator-level displacements increased, they remained within safe limits. Drift ratios stayed below 0.4% for the fixed base and 0.1% for the isolated base, ensuring compliance with IS 1893:2016. NLTH revealed motion-dependent performance, with near-field earthquakes inducing larger displacements but effectively protecting the superstructure. LRBs increase the time period and displacement while reducing the base shear and inter-storey drifts, making any building more seismically reliable. The study highlights LRBs as a robust passive control strategy for seismic resilience, particularly for mid- to low-rise buildings.