Study on reduction of seismic vulnerability of frame-elevated silo by base isolation

doi:10.16265/j.cnki.issn1003-3033.2025.11.1388

Abstract

Abstract:

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.

Key words: base isolation device, frame-supported elevated silo, silo structures, seismic vulnerability, incremental dynamic analysis (IDA), rare earthquake

CLC Number:

X924.4安全控制技术

LUO Yongzhe, ZHANG Jiahao, TENG Zhenchao, JI Jing. Study on reduction of seismic vulnerability of frame-elevated silo by base isolation[J]. China Safety Science Journal, 2025, 35(11): 72-80.

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抗震参数	设防信息
抗震设防类别	丙
抗震设防烈度/(°)	7
基本地震加速度/g	0.10
设计地震分组	第Ⅲ组
场地类别	Ⅳ
场地特征周期/s	0.90

模态	周期/s	X向参与/%	Y向参与/%	Z向参与/%
1	1.299	T_X - 55.32	T_Y - 7.861	R_Z - 0.529
2	1.205	T_X - 7.612	T_Y - 48.74	R_Z - 0.082
3	1.064	T_X - 0.452	T_Y - 0.080	R_Z - 53.06

支座类型	直径/ mm	橡胶厚度/ mm	第1形状系数	第2形状系数	竖向刚度/ (kN·m^-1)	初始刚度/ (kN·m^-1)	屈服强度/ kN	屈服后刚度/ (kN·m^-1)	等效刚度/ (kN·m^-1)
铅芯叠层橡胶支座	700	163	30	5	3 600 000	19 120	106	1 470	2 120
铅芯叠层橡胶支座	900	220	30	5	4 800 000	26 680	227	2 050	3 080
天然叠层橡胶支座	1 000	220	30	5	4 500 000	2 100	—	—	2 100

模态	周期/s	X向参与/%	Y向参与/%	Z向参与/%
1	5.998	T_X - 93.97	T_Y - 0.087	R_Z - 1.904
2	5.931	T_X - 0.093	T_Y - 96.34	R_Z - 0.005
3	4.913	T_X - 1.814	T_Y - 0.012	R_Z - 93.24