采用组合质量-弹簧模型的快堆卧式贮钠罐晃动分析

在核电工程中广泛使用各类形式的储液容器,储液容器的抗震分析必须考虑液体晃动的影响。针对矩形储液容器,不同于传统的单向质量-弹簧模型将液体晃动对容器侧壁、底部的作用都等效为对侧壁的作用,本文提出一种组合质量-弹簧模型及计算公式,模拟了液体晃动分别对容器的侧壁、底部的作用。组合质量-弹簧模型在三维有限元模型上的加载位置更加合理,容器底部的应力结果更加真实。利用组合质量-弹簧模型对中国实验快堆的卧式贮钠罐进行横向晃动有限元计算,算例表明了计算结果的可靠性。组合质量-弹簧模型为储液容器的有限元抗震分析提供了一种有效的方法。

Combined Mass-spring Model Used to Simulate Sloshing of Fluid in CEFR Sodium Storage Tank

A wide variety of liquid storage tanks are designed for nuclear facility. The sloshing analysis is an essential part in seismic analysis of liquid storage tanks. Unlike single-directional mass-spring model adding hydraulic loads over the bottom to those on the walls, a combined mass-spring model was proposed which separated the hydraulic loads on the side walls from those over the bottom and the formulas for rectangular containers were given. The combined model was convenient to build up in 3D FEM and produced more reasonable stress distribution over the bottom. According to numerical results of sloshing analysis for CEFR sodium storage tank, the combined model is reliable. The combined mass-spring model provides a new technique in seismic analysis of liquid storage tanks.