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To mitigate the seismic collapse risks of elevated silo structures, this study adopted base isolation devices to enhance their seismic performance. A photovoltaic-grade ethylene-vinyl acetate (EVA) packaging project was selected as the research object. A finite element model incorporating base isolation was developed using IDA, and seismic fragility analysis was conducted. The maximum inter-story drift ratio was selected as the Engineering Demand Parameter (EDP), while Peak Ground Acceleration (PGA) was adopted as the Intensity Measure (IM). The seismic performance and failure probability of the original structure and the base-isolated structure were compared and analyzed. The results demonstrate that under the rare earthquake (PGA = 0.22 g), peak inter-story drift ratios are reduced by 65.8% (X-direction) and 51.07% (Y-direction) through base isolation. Furthermore, the progression of plastic hinges is effectively suppressed, and the soft-story collapse mechanism is eliminated. Under the rare earthquake, the collapse probability of the base-isolated structure is significantly reduced from 3.63% to 0.173%. Compared to the original structure, the base-isolated structure exhibits significantly better capability in resisting collapse risks induced by low-probability seismic events. This research provides a theoretical foundation and practical guidelines for the seismic isolation design of elevated silo structures.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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