摘要
中国核电厂抗震设计规范推荐采用的Housner模型不适用于复杂形状核电储液结构的流固耦合分析。对于AP1000和CAP1400核电站屏蔽厂房顶部非能动安全壳冷却系统重力水箱(简称PCS水箱),基于圆柱形水箱的Housner等效质量-弹簧模型,通过引入水箱体积修正参数,提出PCS水箱的三维等效质量-弹簧模型。采用有限元软件ADINA建立水箱结构流固耦合整体有限元模型以进行模态分析,计算分析PCS水箱和对应环形水箱在不同尺寸和液体深度条件下的液体晃动自振特性。对比整体有限元模型与三维等效质量-弹簧模型计算结果发现,提出的PCS水箱三维等效质量-弹簧模型能给出其内液体晃动各阶振型的液动压力合理估计值,适用于具有复杂形状的PCS水箱液动压力分析。本文的等效模型方法可推广应用于其他复杂形状水箱的液动压力分析。
As a two-dimensional equivalent massspring model based on a rectangular or cylindrical liquid storage tank,the Housner model is used in seismic response analysis of liquid storage tanks with different geometric shapes.However,based on previous studies,this model is not suitable for fluidstructure coupling analysis of complexshaped nuclear liquid storage structures.To analyze the passive containment cooling system water tanks(PCS tank for short)installed at the top of shield buildings in AP1000and CAP1400nuclear power plants,a threedimensionalequivalentmassspring model is proposed through the introduction of volume correction parameters based on the Housner equivalent massspring model of a cylindrical tank.Then,several fluidstructure coupling finite element models of different tank systems,established with the finite element software ADINA,are used for modal analysis.The natural vibration characteristics of liquid sloshing in PCS and corresponding annular water tanks are calculated and analyzed with different box sizes and liquid depths.The calculation results from the integrated finite element and threedimensional equivalent massspring models are compared,and it is found that the proposed threedimensional equivalent massspring model of PCS tank can give reasonable estimated values of dynamic fluid pressure of liquid sloshing under different modes.It is concluded that the proposed model is suitable for dynamic fluid pressure analysis of a complexshaped PCS tank.This model or method can also be applied to the dynamic fluid pressure analysis of other complexshaped liquid storage tanks.
作者
雷墉
李小军
宋辰宁
张慧颖
李再先
LEI Yong;LI Xiaojun;SONG Chenning;ZHANG Huiying;LI Zaixian(College of Architectural and Civil Engineering, Beijing University of Technology, Beijing 100124 , China;Institute of Geophysics, China Earthquake Administration, Beijing 100081 , China)
出处
《地震工程学报》
CSCD
北大核心
2017年第5期890-897,906,共9页
China Earthquake Engineering Journal
基金
国家自然科学基金资助项目(51421005
51408255)
国家科技重大专项资助项目(2013ZX06002001)
