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<p>An Earthquake is a devastating natural calamity which is harmful to the property as well as human being. Collapse of structures are not affordable at all so, base isolation is the trending technique to overcome these hazards. Different devices are invented in this technique i.e. elastomeric bearing, (New Zealand) NZ bearing, friction pendulum system (FPS), pure friction (PF) etc. The sliding isolator has curved surfaces and incorporates the functions of separation (isolation), energy dissipation and restoring mechanisms. In the study the variable frequency pendulum isolator (VFPI), a piece of earthquake-resistant construction emerges as an advanced base isolation technique that efficiently integrates isolation, energy dissipation, and restoring mechanisms. This research focuses on a parametric study of base isolated system i.e. VFPI. To carry out this study, key design parameters such as the initial time period of isolation system, coefficients of friction and frequency variation factor (FVF) are considered. The study emphasizes the significance of the coefficient of friction in determining the VFPI’s effectiveness, particularly in scenarios with varying excitation characteristics i.e. near-fault, far-fault and low frequency. The findings suggest that VFPI offers superior performance in minimizing seismic impacts on structures by adapting to different frequencies, thus providing enhanced protection. The results of this analysis show that the VFPI is capable of meeting a variety of design specifications and that it is quite successful in preventing near-field ground vibrations.</p>

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Effect of variable frequency pendulum isolator on response of structure under varying ground motion

  • 期刊论文

  • 发表日期：

    2025年4月8日

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  • Reshma Karad,
  • Pranesh Murnal

摘要

An Earthquake is a devastating natural calamity which is harmful to the property as well as human being. Collapse of structures are not affordable at all so, base isolation is the trending technique to overcome these hazards. Different devices are invented in this technique i.e. elastomeric bearing, (New Zealand) NZ bearing, friction pendulum system (FPS), pure friction (PF) etc. The sliding isolator has curved surfaces and incorporates the functions of separation (isolation), energy dissipation and restoring mechanisms. In the study the variable frequency pendulum isolator (VFPI), a piece of earthquake-resistant construction emerges as an advanced base isolation technique that efficiently integrates isolation, energy dissipation, and restoring mechanisms. This research focuses on a parametric study of base isolated system i.e. VFPI. To carry out this study, key design parameters such as the initial time period of isolation system, coefficients of friction and frequency variation factor (FVF) are considered. The study emphasizes the significance of the coefficient of friction in determining the VFPI’s effectiveness, particularly in scenarios with varying excitation characteristics i.e. near-fault, far-fault and low frequency. The findings suggest that VFPI offers superior performance in minimizing seismic impacts on structures by adapting to different frequencies, thus providing enhanced protection. The results of this analysis show that the VFPI is capable of meeting a variety of design specifications and that it is quite successful in preventing near-field ground vibrations.