高温气冷堆核电厂建筑结构采用不同有限元模型的模态分析对比研究

建立有限元模型是核电厂建筑结构模态分析的重要前提。本文以某高温气冷堆核电厂建筑结构为原型,在分析方法相同的前提下,建立2种不同模型（Solid模型和Shell模型）,并对这2种模型进行模态分析。重点分析、对比2种模型的自振频率和振型图,计算分析表明:Solid模型与Shell模型相比,计算得到的结构自振频率值较高,但两者的差异很小,前30阶自振频率相对误差小于3.4%;2种模型的计算结构振型基本一致。研究结果可为核电厂抗震性能分析和设计提供参考。

Comparative Study on Mode Analysis of Different Finite Element Mode of the High Temperature Gas-cooled Reactor Nuclear Power Plant Structure

The establishment of finite element model is the key premise and important step of nuclear power plant building structure modal analysis. In this paper, a high temperature gas cooled reactor nuclear power plant building structure is regarded as a prototype. Building two different models, solid model and shell model, under the same analysis method, modal analysis of these two models is carried out. The natural frequency and mode shapes of the two models are analyzed and compared. The calculation and analysis show that:compared with shell model, the calculated natural frequencies of solid model are higher, but the difference between them is very small, and the relative error of the first 30 natural frequencies is less than 3.4%; the calculated structural vibration modes of the two models are basically the same. Research results can provide reference for seismic performance analysis and design of nuclear power plant.