Earthquakes and Structures

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Analysis of soft deformation limitation of base-isolated structures

  • Jinwei Jiang (School of Civil and Transportation Engineering, Beijing University of Civil Engineering and Architecture) ;
  • Baoyang Yang (School of Civil and Transportation Engineering, Beijing University of Civil Engineering and Architecture)
  • Received : 2023.05.05
  • Accepted : 2023.11.15
  • Published : 2024.01.25
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Abstract

Isolation technology has been proven effective in reducing the seismic response of superstructures, where most of the deformation is concentrated in the isolation layer. However, in cases of earthquakes with intensities surpassing the fortification level of the area, or severe near-fault earthquakes, the isolation layer may experience excessive deformation, resulting in damage to the isolation bearings or collisions with the retaining wall or surrounding buildings. In this study, a finite element model using ABAQUS is established and compared with experimental test results to deeply investigate the influence of limit devices on the isolation layer and its response to the superstructure. The findings reveal that a larger limiter stiffness and a smaller reserved gap can achieve a more effective limiting effect. Nevertheless, a smaller reserved gap and a larger limiter stiffness may result in increased response of the superstructure. Therefore, rational selection of the reserved gap and limiter stiffness is crucial to reduce the acceleration response.

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References

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