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首页> 外文期刊>Journal of structural engineering >Evaluation of ASCE 43-05 Seismic Design Criteria for Rocking Objects in Nuclear Facilities
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Evaluation of ASCE 43-05 Seismic Design Criteria for Rocking Objects in Nuclear Facilities

机译：评估核设施中摇摆物的ASCE 43-05抗震设计标准

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摘要

The seismic interaction of unanchored objects with a seismically qualified system or component in a nuclear power plant (NPP) can be detrimental to nuclear safety. In order to assess the seismic risk, an accurate quantification of the seismic response of unanchored components, such as spent-fuel dry storage casks, portable standby generators, electrical transformers, unreinforced masonry radiation shielding walls, etc., is required. The rocking response and toppling vulnerability of unanchored objects is not covered in nuclear standards, guidelines, and reports, except for an approximate method provided in ASCE/SEI 43-05 to estimate the maximum rocking angle in lieu of nonlinear time history analysis. In this study, the approximate method adopted by ASCE/SEI 43-05 is evaluated, first qualitatively and subsequently by comparing its predictions against results from a series of nonlinear time history analyses (NLTHA). The study concludes that the ASCE/SEI 43-05 method (which has also been adopted in FEMA P-58-1 and is expected to be adopted in the new revision of ASCE 4) provides highly unreliable, and in many cases unconservative, estimates of peak rocking rotation for a wide range of block geometries, under various levels of excitation. Because a reliable simplified method for estimating rocking rotations is not currently available, the paper recommends that rotation demands be obtained from nonlinear dynamic analysis.
机译：未锚定对象与核电厂（NPP）中具有抗震性能的系统或组件之间的地震相互作用可能会损害核安全。为了评估地震风险，需要准确定量未锚固组件的地震响应，例如乏燃料干式储存桶，便携式备用发电机，变压器，未加固的砌体辐射屏蔽墙等。核标准，指南和报告中未涵盖未锚定对象的摇摆响应和倾覆脆弱性，但ASCE / SEI 43-05中提供了一种近似方法来估计最大摇摆角，以代替非线性时程分析。在这项研究中，首先对ASCE / SEI 43-05所采用的近似方法进行了定性评估，然后将其预测结果与一系列非线性时程分析（NLTHA）的结果进行了比较。研究得出的结论是，ASCE / SEI 43-05方法（已在FEMA P-58-1中采用，并有望在ASCE 4的新修订版中采用）提供了高度不可靠的估计，并且在许多情况下并不保守各种激发水平下，各种块状几何体的峰值摇摆旋转的变化。由于目前尚无可靠的简化方法来估计摇摆旋转，因此建议从非线性动力分析中获得旋转需求。

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