基于随机模拟一致危险性谱的核电厂抗震性能分析

为改善概率地震危险性分析对震源传播特性考虑的不足，提出采用随机模拟与概率地震危险性分析结合的方法，充分考虑反应谱生成中震源机制、传播路径和场地效应等影响，生成更为精确的一致危险性谱。结合核电厂具体场地条件对场地近两千年的历史地震进行模拟，并生成同一超越概率下的一致危险性谱（UHS）。为了比较已有的厂址谱（SL-2）和安评报告中的UHS及美国RG1.60谱所生成的地震动对结构抗震性能的影响，以某核电结构为例，建立三维有限元模型，进行动力时程分析。结果表明：不同反应谱对结构的动力响应差别较大，UHS与SL-2对结构的响应较为接近，且略大于SL-2，但小于美国RG1.60谱。基于随机模拟方法生成的一致危险性谱可为核电厂抗震设计提供参考。

Seismic Performance Analysis in Nuclear Power Plant Based on Stochastic Simulation Uniform Hazard Spectrum

In order to consider the propagation characteristics of the source in the probabilistic seismic hazard analysis, the method of combining stochastic simulation with probabilistic seismic hazard analysis was proposed, considering the effect of source mechanism, path and site effect, and could get more accurate uniform hazard spectrum (UHS). A method to simulate the historical earthquake in the site-specific of the nuclear power plant (NPP) and develop the UHS with an equal rate of being exceeded was proposed. To compare the NPP seismic performance of different ground motions generated by existing site spectrum (SL-2), the UHS generated by the safety evaluation report and the US RG1.60 spectrum, three-dimensional finite element model was created to dynamic analysis. The results show that the response of different spectra to the structure is quite different. The response of UHS is closer to SL-2 and slightly larger than the SL-2, but UHS is less than US RG1.60 spectrum. The UHS based on stochastic simulation method can provide a reference for the seismic design of NPP.