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Damping implementation issues for in-structure response estimation of seismically isolated nuclear structures

机译：隔离核结构的结构响应估算的阻尼实施问题

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Seismic (base) isolation of a nuclear power plant (NPP) is a viable strategy to reduce seismic demands in structural elements and nonstructural systems and components. Accurate estimation of in-structure response of base-isolated NPPs is critical to the analysis and design of safety-related structural components. Damping models and their implementation in contemporary analysis platforms play a significant role in the numerical response estimation of a nonlinear system. Most of the recent damping studies cater to moment frame buildings for which nonlinearities are modeled using massless rotational springs. There are unique challenges associated with the implementation of damping to numerical models of the base-isolated NPPs due to the broad frequency range of interest and the markedly different damping characteristics of the isolators and the superstructure. In-structure response spectra of a base-isolated NPP are sensitive to the chosen numerical and modeling techniques, both of which are investigated in this paper. Three representations of base-isolated NPP are considered: (1) a two-node macro model, (2) a lumped-mass stick model, and (3) a detailed finite element model. Rayleigh damping, modal damping, uniform frequency damping, and several combinations thereof were used with the three NPP models to obtain the median response of the base-isolated NPP subject to 30 sets of three-dimensional ground excitations. The results allow informed decisions regarding the selection of a numerical model and damping implementation to different analysis platforms needed to obtain a reliable in-structure response of base-isolated NPPs subject to earthquake shaking.
机译：核电厂（NPP）的地震（基地）隔离是一种可行的策略，以减少结构元素和非结构系统和组件的地震要求。准确估计基本隔离的NPP的结构内响应对于安全相关结构部件的分析和设计至关重要。阻尼模型及其在当代分析平台中的实现在非线性系统的数值响应估计中起着重要作用。最近的大多数阻尼研究迎合了时刻框架建筑，其中非线性使用麻自动旋转弹簧进行建模。由于景点的频率范围和隔离器和上部结构的显着不同的阻尼特性，存在对基本隔离NPP的数值模型的影响有关的独特挑战。碱基分离的NPP的结构响应光谱对所选择的数值和建模技术敏感，两者都在本文中研究。考虑了三个基本隔离NPP的表示：（1）双节点宏模型，（2）集成质量棒模型，（3）详细有限元模型。 Rayleigh阻尼，模态阻尼，均匀的频率阻尼，以及其三种NPP模型使用若干组合，以获得碱基分离的NPP的中值响应，其30套三维地面激发。结果允许有关选择数值模型和阻尼实施的明智的决定，以获得基本隔离的NPPS的可靠结构响应所需的不同分析平台进行地震震动。

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