某核设施变截面矩形水箱结构的力学分析

MECHANICAL ANALYSIS OF VARIABLE CROSS-SECTION RECTANGULAR WATER TANK IN A NUCLEAR FACILITY

变截面处应力突变和中心轴不连续是变截面矩形水箱结构的特点,也是该结构力学分析的难点。根据某工程实例需要,通过弯曲刚度等效,建立变截面水箱结构的变厚度板分析模型。通过在变厚度板的变截面处的上部板、下部板施加不同的附加弯矩,提出并实现将变截面板中心轴的不连续等效为附加弯矩。因此,应用分段求解法和转角变形连续,给出了各种工况及其组合作用下该结构变截面应力理论近似解,并分析了其应力分布规律。与有限元数值模拟对比,说明了文中方法具有使用方便、计算精度高和推广性好等优点。

With the variable cross-section rectangular, water tank has the characteristics of sudden change in stress and discontinuity of the central axis at the variable cross-section, which is the difficult problem in the mechanical analysis of the structure. Taking an actual project as the research object, the variable thickness plate analysis model of the variable cross-section water tank is established by the equivalent bending stiffness. The discontinuity of the central axis of the variable section plate is equivalent to the additional bending moment by the different additional bending moment, which means the upper plate and the lower plate, respectively, are applied to at the variable cross-section of the variable thickness plate. The theoretical approximate solution of the structure under various working conditions and its combination is given by applying the subsection solution method and continuous corner deformation, and the stress distribution rules are also studied. By comparing with the finite element numerical simulation, the advantages of the method proposed is with convenient operation, high calculation accuracy, and easy generalization.