钢衬壳后屈曲问题分析

Analyses of the steel liner postbuckling problem

本文用两种方法分析了核电站预应力混凝土安全壳中的内衬壳（钢衬壳）在温度应力作用下的后屈曲问题。认为钢衬壳模型是钢衬板模型的一种特殊缺陷形式，用Ｋｏｉｔｅｒ初始后屈曲渐近分析理论研究了钢衬壳的后屈曲问题。另外，本文从大挠度偏微分方程出发导出控制钢衬壳后屈曲的带有参数的非线性方程组，且用伪弧长法追踪其后屈曲平衡路径。文中用两种方法分析了四点铆固钢衬壳的后屈曲性态，并进行了比较。

In the application of prestressed concret reactor containments, the safety enclosure will be obtained through a steel liner membrane, which is attached pointwise to the interior concrete surface. Based on the large deflection’s variational theorem of elastic shell considering the effect of temperature, the nonlinear governing equations for the postbuckling problem, the boundary conditions and the complementary conditions are obtained. Two different approaches are used, i.e., the asymptotic analyses of intial postbuckling problem and the full nonlinear analyses of the postbuckling problem for the liner. The stud supported liner models are investigated and the range of the asymptotic preditions, the postbuckling paths of the liner models, the lowest postbuckling tempreatures of the liner models are also clarified.