Local Stiffness Calculation and Characteristics Analysis of Cylinder and Lug Connection Structure
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摘要: 核电厂反应堆系统中典型筒体支耳连接结构的局部刚度准确计算具有重要的工程意义。本文建立了筒体支耳连接结构的三维有限元模型，分析得到了有限元计算总位移，并给出由集中力和扭矩分别引起的梁式位移计算方法，从而求解梁式总位移，进而得到筒体支耳连接结构的局部刚度。通过建立筒体支耳连接结构的分解模型进行局部刚度计算，探讨了与整体模型局部刚度计算结果的差异。采用整体模型计算方法，选取不同的边界面进行局部刚度计算，得到了相应的局部刚度变化规律，同时通过调整支耳角度研究其对局部刚度特性的影响。本文研究可为筒体支耳连接结构工程设计提供参考。Abstract: It is of great engineering significance to accurately calculate the local stiffness of typical cylinder and lug connection structures in nuclear power plant reactor system. In this paper, a three-dimensional finite element model of cylinder and lug connection structure is established. The total displacement can be acquired by finite element calculation, and the calculation method is respectively introduced to solve the beam displacement due to concentrated force and torque, which will be used to calculate the final local stiffness of cylinder and lug connection structure. The separate model of cylinder and lug connection structure is established, which is also used to calculate the final local stiffness, and the local stiffness difference is discussed by comparing with the calculation results of whole model. The whole model calculation method is considered to calculate the local stiffness by selecting different boundary planes, and the variation law of local stiffness is obtained. At the same time, the angle of lug is adjusted to calculate and study the influence on local stiffness characteristics. This paper can provide reference for engineering design of cylinder and lug connection structure.
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图 2 筒体支耳连接结构有限元模型
红色箭头指示力载荷方向
Figure 2. Finite Element Model of Cylinder and Lug Connection Structure
图 6 不同距离下的筒体支耳连接结构有限元模型
Figure 6. Finite Element Model of Cylinder and Lug Connection Structure under Different Distance
图 9 不同支耳角度下的筒体支耳连接结构有限元模型
Figure 9. Finite Element Model of Cylinder and Lug Connection Structure under Different Angle of Lug
表 1 局部刚度计算相关结果
Table 1. Related Results of Local Stiffness Calculation
参数 数值 有限元计算总位移/mm 5.716 梁式位移（集中力）/mm 1.592 梁式位移（扭矩）/mm 0.1236 力载荷/N 106 局部刚度/(N·m−1) 2.5×108 
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表 2 不同单元尺寸下的局部刚度
Table 2. Local Stiffness under Different Element Size
筒体模型
网格尺寸/m支耳模型
网格尺寸/m局部刚度/（N·m−1） 0.08 0.08 2.684×108 0.08 0.09 2.684×108 0.08 0.10 2.684×108 0.09 0.08 2.696×108 0.09 0.09 2.695×108 0.09 0.10 2.696×108 0.10 0.08 2.699×108 0.10 0.09 2.699×108 0.10 0.10 2.699×108
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