燃料组件简化梁模型剪切系数初步研究  

Preliminary Study on Shear Coefficient of Simplified Beam Model of Fuel Assembly

作　　者：沈平川[1] 黄旋[1] 刘建 张珂 皇甫聿昭 SHEN Pingchuan;HUANG Xuan;LIU Jian;ZHANG Ke;HUANGFU Yuzhao(Science and Technology on Reactor System Design Technology Laboratory,Nuclear Power Institute of China,Chengdu 610041,China)

机构地区：[1]中国核动力研究设计院核反应堆系统设计技术重点实验室,成都610041

出　　处：《机械工程师》2022年第6期93-95,共3页Mechanical Engineer

摘　　要：燃料组件简化梁模型用于时程动力计算,一般通过试验测试获取梁截面参数,其中剪切系数较大。文中对于简化梁剪切系数的物理本质和计算方法开展初步研究。根据燃料组件结构特点,忽略非线性,建立初步研究线性结构模型,使用有限元计算集中载荷作用下的简化梁剪切系数。使用弯矩分解方法,把梁弯矩分解为纯弯曲型和侧向滑移型2部分,2种弯矩的变形特点在分节管束结构中对应2种不同的惯性矩。简化梁截面参数使用较大的纯弯曲型惯性矩,使得侧向滑移型弯矩作用下的简化梁弯曲变形小于实际结构。简化梁通过增大剪切变形来弥补弯曲变形差值,使剪切系数较大。最后给出简化梁剪切系数理论公式,计算结果与有限元计算相同。The simplified beam model of fuel assembly is used for time-history dynamic analysis.Beam section parameters are generally obtained by test.There exists a numerically large shear coefficient.The physical significance and calculation method of the abnormal shear coefficient are studied.According to the structural characteristics of fuel assembly,a linear structure model for preliminary study is established.The shear coefficient of simplified beam under concentrated load is calculated by finite element method.Using the bending moment decomposition method,the beam bending moment is decomposed into two parts:pure-bending and lateral-slipping.The deformation characteristics of the two bending moments correspond to two different moments of inertia in the segmented tube bundle structure.The simplified beam section parameters uses a larger pure bending moment of inertia,so that the bending deformation of the simplified beam under the action of the lateral slip bending moment is smaller than the actual structure.The simplified beam compensates for the difference in bending deformation by increasing the shear deformation,so that the shear coefficient is larger.Finally,a theoretical formula for shear coefficient is given,and the calculation result is the same as the finite element calculation.

关 键 词：燃料组件 简化梁模型 剪切系数 有限元计算 弯矩分解 

分 类 号：TL352[核科学技术—核技术及应用]