核电工程环形水箱动力分析的附加质量法比较研究  

Comparative study on added mass methods for dynamic analysis of annular water tank in nuclear engineering

作　　者：宝鑫[1] 刘晶波[1] 杨悦[1] 谭辉[1] 王东洋[1] 李雪 BAO Xin;LIU Jingbo;YANG Yue;TAN Hui;WANG Dongyang;LI Xue(Department of Civil Engineering,Tsinghua University,Beijing 100084,China)

机构地区：[1]清华大学土木工程系

出　　处：《建筑结构学报》2018年第9期130-139,共10页Journal of Building Structures

基　　金：国家科技重大专项项目(2010ZX06002-10,2011ZX06002-10)

摘　　要：以第三代核电站中环形重力排水箱结构地震作用下的动力反应为研究对象,拟提出一种计算精度较高、实现较为便捷的适用于环形容器的附加质量动力分析方法。根据Housner附加质量理论,改进了适用于环形储液容器的附加质量分布模型。在ANSYS有限元软件中实现了基于该分布模型的改进附加质量法的建模与计算。以能够考虑流体-结构相互作用的流-固耦合有限元法计算结果为基准,对比分析了改进的附加质量法、工程界常用的60%和100%均布附加质量法的适用性及在模态分析、动力时程分析中的计算精度。研究结果表明：改进的附加质量法在不同地震动、模型尺寸、储液率情况下对于结构振动频率、变形和内力均有较高的计算精度,可用于环形水箱结构的实际工程分析;60%均布附加质量法的计算精度略低于改进的附加质量法,且计算精度易受模型尺寸影响,但此附加质量分布形式简单,易于实现,能够满足工程应用需求;100%均布附加质量法过高估计了结构变形和结构内力,且计算误差受模型尺寸影响较大,计算精度较差。研究结果可为环形容器附加质量法在工程中的应用提供借鉴。Taking the seismic response of the annulus gravity drainage tank in the third generation nuclear power plant as the research object, an added mass dynamic analysis method suitable for the annular container with high accuracy and convenient realization is proposed. According to Housner＇ s theory, the added mass distribution model applied to the annular water tank was improved. The modeling and calculation of the added mass method based on the improved distributed model was implemented in ANSYS. The applicability and accuracy in modal and dynamic time history analysis of the current approach and the commonly used 60% and 100% distributed added mass methods were compared with the fluid structure interaction finite element method （FSI-FEM） where the interaction between the fluid and structure was directly simulated. The results show that for various cases, such as different ground motions, model sizes and liquid storage rates, the improved added mass method has higher accuracy in the natural frequency, deformation and the internal forces results. Therefore, the improved added mass method can be used for the actual engineering analysis of the annular tank structure. The accuracy of 60% distributed added mass method is slightly lower and susceptible to the model size. However, this added mass distribution is simple and easy to implement, which make it meet the engineering application requirements to a certain extent. For the 100% distributed added mass method, however, the dynamic response is overestimated considerably and the calculation error is greatly affected by the model size. This study can provide insight in the application of the added mass method for annulus containers in industry.

关 键 词：储液结构 环形容器 附加质量 流-固耦合 动力分析 有限元法 双向地震动 地震响应 

分 类 号：TU279.748[建筑科学—建筑设计及理论] TU311.41