带缺陷管系结构的塑性极限分析

Plastic limit analysis of defective piping systems

工程中的管系结构通常承受内压、温度等载荷的共同作用 ,通过对其进行塑性极限分析 ,可以估计管系结构的承载能力。该文对工程中的管系结构进行一维弹性分析 ,然后根据分析的结果对管系中应力较大的位置进行三维极限分析 ,从而估计管系的整体承载能力。提出了一种直接迭代算法来求解三维结构的上限极限载荷。调查了 4种不同类型的缺陷对管道上限极限载荷的影响 ,并研究了温度载荷作用下 ,不同类型缺陷对应的失效模式。

In most cases, piping systems will experience the combination of internal pressure and temperature. Limit analysis can be used to estimate the carrying capacity of piping systems. This paper analyzed piping systems with a one dimensional elastic method. The key part of the piping systems was also analyzed with a 3 D limit analysis method to estimate the carrying capacity of the whole piping system. A direct iterative algorithm was used to determine the kinematic limit load of the 3 D structure. The effects of four kinds of typical slots on the limit loads of pipe elbows were investigated in detail. The failure modes corresponding to the different slot configurations are studied.