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This study aims to verify the IS 1893: 2022 target time period for isolation bearing in a base isolated (BI) building (part 6). In SAP2000v22, a nine-storey 2D RC frame building was modelled for this purpose. Using “high damping rubber bearing” HDRB, BI variants for different target time periods—1, 1.5, 2, and 2.5 s—were generated. The fixed base (FB) building's modal time period was determined to be 0.64 s. The study discovered that while storey displacement increased over time, the rate of increase was found to have slowed. The BI building's response increased for target time periods of 1 to 1.5 s, according to the drift ratio (IDR) and base shear plots. However, for target time periods of 2 to 2.5 s, a significant reduction in the IDR and base shear was observed, as these time periods were close to the triple of 0.64. Therefore, this study confirms the target time period of the elastomeric isolation bearing under near field earthquake minimum criteria.

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Effect of Time Period Variation of HDRB on the Response of a Base-Isolated Building Under Near Field Earthquake

  • 会议论文

  • 发表日期：

    2025年

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  • Jitendra Gudainiyan,
  • Praveen Kumar Gupta,
  • Nakul Gupta

摘要

This study aims to verify the IS 1893: 2022 target time period for isolation bearing in a base isolated (BI) building (part 6). In SAP2000v22, a nine-storey 2D RC frame building was modelled for this purpose. Using “high damping rubber bearing” HDRB, BI variants for different target time periods—1, 1.5, 2, and 2.5 s—were generated. The fixed base (FB) building's modal time period was determined to be 0.64 s. The study discovered that while storey displacement increased over time, the rate of increase was found to have slowed. The BI building's response increased for target time periods of 1 to 1.5 s, according to the drift ratio (IDR) and base shear plots. However, for target time periods of 2 to 2.5 s, a significant reduction in the IDR and base shear was observed, as these time periods were close to the triple of 0.64. Therefore, this study confirms the target time period of the elastomeric isolation bearing under near field earthquake minimum criteria.