Earthquakes and Structures

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Seismic response of structures with a rocking seismic isolation system at their base under narrow-band earthquake loading

  • Miguel A. Jaimes (Instituto de Ingenieria, UNAM) ;
  • Salatiel Trejo (Facultad de Ingenieria, UNAM) ;
  • Valentin Juarez (Facultad de Ingenieria, UNAM) ;
  • Adrian D. Garcia-Soto (Departamento de Ingeniería Civil, Universidad de Guanajuato)
  • Received : 2022.09.27
  • Accepted : 2023.09.25
  • Published : 2023.10.25
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Abstract

This study investigates a rocking seismic isolation (RSI) system as a seismic protection measure against narrow-band ground-motions generated by earthquakes. Structures supported over RSIs are considered capable of reducing the lateral demands and damage of the main structural system through lifting and rocking. This lifting and rocking during earthquake activity is provided by free-standing columns. A single-degree-of-freedom (SDOF) system supported on a RSI system is subjected to narrow-band seismic motions and its response is compared to an analog system without RSI. The comparison is then extended to reinforced concrete linear frames with and without RSI; three-bay frames with 11 and 17 storeys are considered. It is found that the RSI systems significantly reduce acceleration and displacement demands in the main structural frames, more noticeably if the first structural mode dominates the response and for ratios of the predominant frequency of the ground motion to the predominant frequency of the main frame near one. It is also found that the RSI system is more effective in reducing lateral accelerations and displacements of the main structure when the aspect ratio, b/h, and size, R, of the free-standing columns decrease, although the rocking stability of the RSI system is also reduced.

Keywords

Acknowledgement

This research was financially supported by the Project IG100623-PAPIIT-UNAM. Additional support was sponsored by Instituto de Ingenieria at UNAM through the Research Fund R528. We also thank two anonymous reviewers whose comments and suggestions help us to importantly improve this article.

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