Earthquakes and Structures

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Seismic responses of structure isolated by FPB subject to pounding between the sliding interfaces considering soil-structure interaction

  • Yingna Li (School of Transportation and Civil Engineering, Nantong University) ;
  • Jingcai Zhang (School of Transportation and Civil Engineering, Nantong University)
  • Received : 2023.11.30
  • Accepted : 2024.04.11
  • Published : 2024.06.25
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Abstract

The study aims to investigate the pounding that occurs between the isolator's ring and slider of isolated structures resulting from excessive seismic excitation, while considering soil-structure interaction. The dynamic responses and poundings of structures subjected a series seismic records were comparatively analyzed for three different soil types and fixed-base structures. A series of parametric studies were conducted to thoroughly discuss the effects of the impact displacement ratio, the FPB friction coefficient ratio, and the radius ratio on the structural dynamic response when considering impact and SSI. It was found that the pounding is extremely brief, with an exceptionally large pounding force generated by impact, resulting in significant acceleration pulse. The acceleration and inter-story shear force of the structure experiencing pounding were greater than those without considering pounding. Sudden changes in the inter-story shear force between the first and second floors of the structure were also observed. The dynamic response of structures in soft ground was significantly lower than that of structures in other ground conditions under the same conditions, regardless of the earthquake wave exciting the structure. When the structure is influenced by pulse-type earthquake records, its dynamic response exhibits a trend of first intensifying and then weakening as the equivalent radius ratio and friction coefficient ratio increase. However, it increases with an increase in the pounding displacement ratio, equivalent radius ratio, friction coefficient ratio, and displacement ratio when the structures are subjected to non-pulse-type seismic record.

Keywords

Acknowledgement

This research is financially supported by the Natural Science Foundation of Nantong (Grant No. JC2023025), the National Natural Science Foundation of China (Grant No. 52361135807), and the Talent introduction start-up fund of Nantong University (Grant No. 135443633082).

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