A piping system stress analysis need to be re-performed for structural integrity assessment after reinforcement of a pipe with significant wall thinning. For efficient stress analysis, a one-dimensional beam element for the wall-thinned pipe with reinforcement needs to be developed. To develop the beam element, this work presents analytical equations for elastic stiffness of the wall-thinned pipe with reinforcement are analytically derived for axial tension, bending and torsion. Comparison with finite element (FE) analysis results using detailed three-dimensional solid models for wall-thinned pipe with reinforcement shows good agreement. Implementation of the proposed solutions into commercial FE programs is explained.

在对壁明显减薄的管道进行加固后，需要重新执行管道系统应力分析以进行结构完整性评估。为了进行有效的应力分析，需要开发一种用于带钢筋的薄壁管的一维梁单元。为了开发梁单元，这项工作提出了带有钢筋的薄壁管的弹性刚度的解析方程，这些方程是解析推导出轴向张力、弯曲和扭转的。与使用带有加强的壁薄管的详细三维实体模型的有限元 (FE) 分析结果进行比较显示出良好的一致性。解释了将建议的解决方案实施到商业 FE 程序中。