核能电厂隔震系统设计(英文)

通过一系列简化模型的非线性动力分析,来研究隔震核能电厂受相当于设计地震与超越设计地震的地震力作用下的地震反应。该文以三个美国核能电厂厂址为例进行分析,包括位于美国东部的North Anna、Votgle以及美国西部的Diablo Canyon。所研究的隔震器包括铅心与天然橡胶隔震器。研究重点在理清地震力与隔震器力学性值不确定性对结构地震反应的影响。该文仅就North Anna的分析与结果进行介绍。该研究的成果已被纳入美国土木工程师学会新版核能电厂结构物耐震分析规范ASCE-4中。

Seismic design of base-isolation systems for nuclear power plants

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 NPPs.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),three types of isolators(lead rubber,Friction PendulumTM and low-damping rubber bearings),and realistic mechanical properties for the isolators.Estimates were made of the ratio of the 99%-ile(90%-ile) 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.Only the results for the rock site in the Central and Eastern United States and rubber bearings are presented.The results of this study provide the technical basis for the revision of ASCE Standard 4.