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Earthquakes and Structures Volume 26, Number 6, June 2024 , pages 463-475 DOI: https://doi.org/10.12989/eas.2024.26.6.463 |
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Seismic responses of structure isolated by FPB subject to pounding between the sliding interfaces considering soil-structure interaction |
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Yingna Li and Jingcai Zhang
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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. | ||
| Key Words | ||
| friction pendulum bearing (FPB); pounding; seismic response; soil-structure interaction (SSI) | ||
| Address | ||
| Yingna Li: 1) School of Transportation and Civil Engineering, Nantong University, Nantong, 226019, China, 2) Zhixing Technology Nantong Co., Ltd, Nantong, 226010, China Jingcai Zhang: 1) School of Transportation and Civil Engineering, Nantong University, Nantong, 226019, China, 2) Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education, Harbin Institute of Technology, Harbin, 150090, China, 3) Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters of the Ministry of Industry and Information Technology, Harbin Institute of Technology, Harbin, 150090, China | ||