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<p>Among elastomeric seismic isolation devices, lead rubber bearings (LRB) and high damping rubber bearings (HDRB) are commonly preferred due to their reliable energy dissipation mechanisms. This study investigates and compares the seismic performance of LRB and HDRB isolation systems applied to a seven-story reinforced concrete building. A numerical model of the structure was developed in SAP2000 and analyzed through nonlinear time-history analysis. The seismic responses of fixed-base, LRB-isolated, and HDRB-isolated models were evaluated using the 1999 Kocaeli and 1992 Landers earthquake records scaled to the target design spectrum. To investigate the influence of structural capacity, two material strength scenarios were considered: one representing newly designed structures and the other representing existing buildings with reduced material strength. The results indicate that both LRB and HDRB systems effectively improve structural performance, while HDRB exhibits relatively better performance in reducing force and acceleration demands due to its higher inherent damping capacity. In both material strength scenarios, the isolated models demonstrated consistent reductions in seismic demand, confirming that the effectiveness of base isolation is governed primarily by isolator characteristics rather than structural material strength alone. These findings highlight the applicability of elastomeric isolation systems for both newly designed and existing reinforced concrete buildings subjected to seismic loading.</p>

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Comparative seismic performance of LRB and HDRB systems in reinforced concrete buildings

  • 期刊论文

  • 发表日期：

    2026年5月27日

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  • Arcan Yanik,
  • Demet Okuroğlu

摘要

Among elastomeric seismic isolation devices, lead rubber bearings (LRB) and high damping rubber bearings (HDRB) are commonly preferred due to their reliable energy dissipation mechanisms. This study investigates and compares the seismic performance of LRB and HDRB isolation systems applied to a seven-story reinforced concrete building. A numerical model of the structure was developed in SAP2000 and analyzed through nonlinear time-history analysis. The seismic responses of fixed-base, LRB-isolated, and HDRB-isolated models were evaluated using the 1999 Kocaeli and 1992 Landers earthquake records scaled to the target design spectrum. To investigate the influence of structural capacity, two material strength scenarios were considered: one representing newly designed structures and the other representing existing buildings with reduced material strength. The results indicate that both LRB and HDRB systems effectively improve structural performance, while HDRB exhibits relatively better performance in reducing force and acceleration demands due to its higher inherent damping capacity. In both material strength scenarios, the isolated models demonstrated consistent reductions in seismic demand, confirming that the effectiveness of base isolation is governed primarily by isolator characteristics rather than structural material strength alone. These findings highlight the applicability of elastomeric isolation systems for both newly designed and existing reinforced concrete buildings subjected to seismic loading.