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首页> 外文期刊>Bulletin of earthquake engineering >Seismic stability of two interconnected steel structures freely standing on the floor
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Seismic stability of two interconnected steel structures freely standing on the floor

机译：自由地站在地板上的两个相互连接的钢结构的抗震稳定性

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Nuclear fuel fabrication and reprocessing facilities have glove boxes that are extensively used as a primary containment for radiological material. These equipment are maintained under negative pressure using ventilation system and possess high degree of leak tightness. Sometimes, they are used as a standalone structure and many a times, interconnected to each other. Normally, they are not anchored to the floor, which raises serious concerns about their seismic performance. To check seismic stability of the glove boxes and evaluate safety margins in design, tri directional fullscale shake table experiments of two interconnected glove boxes had been carried out. Two configurations were compared; in first, both the boxes were connected through flexible linkage (material transfer tunnel) and in second both were rigidly connected via structural members. Objective of experiments was to observe effects of seismic excitation on leak tightness, structural integrity and overall stability of two interconnected glove boxes. Subsequently, nonlinear finite element analysis was carried out to establish and develop analysis methodology. Experimental results were utilized for model benchmarking. Furthermore, a numerical method was developed to determine safe upper bounds on sliding displacements. This paper highlighted critical findings emanated from experimental results and examined their effect on seismic stability. Enhanced seismic stability in case of rigidly connected boxes was observed. Rigid body motions (mainly sliding and low magnitude rocking) dominated the response with very limited effect of elastic motions. Methodology used for modelling and analyzing glove boxes under seismic loading using finite element methods was also presented.
机译：核燃料制造和后处理设施的手套箱被广泛用作放射材料的主要容器。这些设备使用通风系统保持在负压下，并具有高度的密封性。有时，它们被用作独立的结构，并且多次相互连接。通常，它们不固定在地板上，这引起了人们对其抗震性能的严重关注。为了检查手套箱的抗震稳定性并评估设计的安全裕度，已对两个相互连接的手套箱进行了全方位的全方位振动台实验。比较了两种配置;首先，两个盒子都通过挠性联动装置（材料传输通道）连接，第二个都通过结构构件牢固地连接。实验的目的是观察地震激励对两个相互连接的手套箱的密封性，结构完整性和整体稳定性的影响。随后，进行了非线性有限元分析，以建立和发展分析方法。实验结果用于模型基准测试。此外，开发了一种数值方法来确定滑动位移的安全上限。本文重点介绍了从实验结果中得出的重要发现，并研究了它们对地震稳定性的影响。观察到刚性连接箱的情况下增强了地震稳定性。刚体运动（主要是滑动和低幅度的摇摆）主导了响应，而弹性运动的作用非常有限。还提出了使用有限元方法对地震作用下的杂物箱进行建模和分析的方法。

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