1.北京交通大学土木建筑工程学院,北京 100044
2.中国航空规划设计研究总院有限公司,北京 100120
刘佩(1982—),女,副教授,博士。主要从事地震易损性及结构健康监测研究。E‑mail: peiliu@bjtu.edu.cn
收稿:2021-11-11,
修回:2021-11-18,
纸质出版:2022-12-28
移动端阅览
刘佩,袁晨瑜,杨维国等.博物馆‑展柜‑浮放文物系统地震滑移与摇摆响应分析[J].防灾减灾工程学报,2022,42(06):1203-1212.
LIU Pei,YUAN Chenyu,YANG Weiguo,et al.Seismic Sliding and Rocking Response Analysis for Museum‑Showcase⁃Freestanding Artifact Systems[J].Journal of Disaster Prevention and Mitigation Engineering,2022,42(06):1203-1212.
刘佩,袁晨瑜,杨维国等.博物馆‑展柜‑浮放文物系统地震滑移与摇摆响应分析[J].防灾减灾工程学报,2022,42(06):1203-1212. DOI: 10.13409/j.cnki.jdpme.20211111011.
LIU Pei,YUAN Chenyu,YANG Weiguo,et al.Seismic Sliding and Rocking Response Analysis for Museum‑Showcase⁃Freestanding Artifact Systems[J].Journal of Disaster Prevention and Mitigation Engineering,2022,42(06):1203-1212. DOI: 10.13409/j.cnki.jdpme.20211111011.
目前评估浮放馆藏文物的地震安全性时,未充分考虑博物馆‑展柜‑文物系统的影响,并通常忽略展柜的动力特性。考虑文物与展柜间浮放界面及结构的非线性、展柜的自振频率和等效为矩形刚体的文物,给出了博物馆‑展柜‑文物系统解耦的有限元建模方法。以受三条单向地震波作用的某四层框架结构为例,考虑位于地面及不同楼层的四种展柜,对发生纯滑移、纯摇摆及滑移‑摇摆运动的三类文物响应进行了分析,并与纯滑移和纯摇摆文物的理论运动方程所得响应进行了对比验证。结果表明:频率为10 Hz的展柜中文物的滑移和摇摆响应最大,20 Hz、30 Hz和刚体展柜中文物的响应接近;随着楼层升高,文物的最大滑移量和摇摆角均增大;文物发生滑移‑摇摆运动时的最大滑移量与摇摆角分别小于相同摩擦系数下纯滑移和相同宽高比下纯摇摆的文物,并随着文物宽高比和摩擦系数的增大而减小。
When assessing the seismic safety of freestanding museum artifacts, the influence of museum-showcase-artifact system was not adequately considered, and the dynamic properties of showcases were usually ignored in previous studies. The decoupled finite element modeling technique for the museum-showcase-artifact system was presented in this paper. The nonlinearity of the structure, the interface between the artifact and showcase as well as the natural frequency of the showcase were considered, and the artifact was assumed as a rigid block in the models. A four-story frame structure subjected to three unidirectional earthquake records with four types of showcases located on the ground and on different floors was taken as an example. The seismic response of the artifacts with pure sliding, pure rocking and sliding-rocking motions was analyzed. The pure sliding displacements and pure rocking angles obtained from the finite element models were compared with those from the equations of motion, respectively. Results show that the sliding and rocking response of the artifact in the showcase with a frequency of 10 Hz is the largest, while the response of the artifacts in the showcases with frequencies of 20 Hz and 30 Hz and rigid showcase is similar. Moreover, the maximum sliding displacement and rocking angle of the artifact increase as the floor level goes higher. Besides, the maximum sliding displacement and rocking angle of the artifact in the sliding-rocking motion are smaller than the counterparts in the pure sliding motion with the same friction coefficient and in the rocking motion with the same width-to-height ratio, respectively. Also, they decrease with the increase of width-to-height ratio and friction coefficient.
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