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Response of base-isolated nuclear structures for design and beyond- design basis earthquake shaking

机译：基础隔震核结构对设计震荡和超设计震荡的响应

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The American Society of Civil Engineers (ASCE) 43-05 presents two performance objectives for the design of nuclear structures, systems and components in nuclear facilities: (1)1% probability of unacceptable performance for 100% design basis earthquake (DBE) shaking and (2) 10% probability of unacceptable performance for 150% DBE shaking. To aid in the revision of the ASCE 4-98 procedures for the analysis and design of base-isolated nuclear power plants and meet the intent of ASCE 43-05, a series of nonlinear response-history analyses was performed to study the impact of the variability in both earthquake ground motion and mechanical properties of isolation systems on the seismic responses of base-isolated nuclear power plants. Computations were performed for three representative sites (rock and soil sites in the Central and Eastern United States and a rock site in the Western United States) and three types of isolators (lead rubber, Friction Pendulum and low-damping rubber bearings) using realistic mechanical properties for the isolators. Estimates were made of (1) the ratio of the 99th percentile (90th percentile) response of isolation systems computed using a distribution of spectral demands and distributions of isolator mechanical properties to the median response of isolation systems computed using best-estimate properties and 100% (150%) spectrum-compatible DBE ground motions; (2) the number of sets of three-component ground motions to be used for response-history analysis to develop a reliable estimate of the median response of isolation systems. The results of this study provide the technical basis for the revision of ASCE Standard 4-98.
机译：美国土木工程师协会（ASCE）43-05为核设施中的核结构，系统和组件的设计提出了两个性能目标：（1）100％设计基准地震（DBE）摇晃和不可接受性能的可能性为1％ （2）对于150％DBE摇晃，出现不可接受的性能的可能性为10％。为了帮助修订ASCE 4-98的基础隔离核电站分析和设计程序并满足ASCE 43-05的意图，进行了一系列非线性响应历史分析以研究核反应堆的影响。地震对地震动和隔震系统力学性能的变化对基础隔震核电站地震响应的影响。使用逼真的机械对三个代表性站点（美国中部和东部的岩石和土壤站点以及美国西部的岩石站点）和三种类型的隔离器（铅橡胶，摩擦摆和低阻尼橡胶轴承）进行了计算隔离器的属性。进行以下估算：（1）使用频谱需求分布和隔离器机械性能分布计算的隔离系统的第99个百分点（第90个百分位数）响应与使用最佳估计属性和100％计算的隔离系统中值响应之比（150％）频谱兼容的DBE地面运动； （2）用于响应历史分析的三分量地面运动的套数，以得出隔离系统中值响应的可靠估计。这项研究的结果为修订ASCE标准4-98提供了技术基础。

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