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The present study deals with the seismic performance assessment of ten storey RC building with and without base isolation system under the mainshock and one aftershock of earthquakes. The non-linear time history analysis is carried out in the commercial software SAP 2000 to investigate the seismic behavior of base building frame with Lead rubber bearing. Two ground motions of far field and near field earthquakes and two levels of earthquakes are considered for the analysis. The response parameters of interest are base shear, top-storey displacement and absolute acceleration, number of hinges, maximum inter-storey drift, and isolator displacement. The seismic behavior of the building frame is investigated with the help of maximum and residual responses during and after the MS-AS sequences. Further, it is concluded that (i) the residual responses of the LRB base isolated (BI) frame depend on the level of PGA and are response-specific; (ii) the maximum storey drift is determined to be modest at a lower PGA level; (iii) the pattern of maximum responses in the single aftershock is not appreciably altered by the residual responses after the mainshock in isolated frame.

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Seismic Performance Evaluation of Base Isolated Building Frame with LRB Under the Action of Mainshock and Aftershock

  • 会议论文

  • 发表日期：

    2025年

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  • Aditi Vibhute,
  • S. D. Bharti,
  • M. K. Shrimali,
  • Sunita Tolani

摘要

The present study deals with the seismic performance assessment of ten storey RC building with and without base isolation system under the mainshock and one aftershock of earthquakes. The non-linear time history analysis is carried out in the commercial software SAP 2000 to investigate the seismic behavior of base building frame with Lead rubber bearing. Two ground motions of far field and near field earthquakes and two levels of earthquakes are considered for the analysis. The response parameters of interest are base shear, top-storey displacement and absolute acceleration, number of hinges, maximum inter-storey drift, and isolator displacement. The seismic behavior of the building frame is investigated with the help of maximum and residual responses during and after the MS-AS sequences. Further, it is concluded that (i) the residual responses of the LRB base isolated (BI) frame depend on the level of PGA and are response-specific; (ii) the maximum storey drift is determined to be modest at a lower PGA level; (iii) the pattern of maximum responses in the single aftershock is not appreciably altered by the residual responses after the mainshock in isolated frame.