一、引言 外压稳定分析是埋藏式钢管设计的一个重要内容,常常是设计的控制情况.当外压稳定不足时,外部加劲可提高钢管抗外压的能力.根据加劲构件的形式,埋藏式钢管可分为加劲环式和锚筋(包括锚片)式两大类. 环形的加劲肋对提高钢管抗外压的能力具有显著效果,工程界对设计这种钢管也有较丰富的经验. I. INTRODUCTION Analysis of external pressure stability is an important part of buried steel pipe design, and it is often the control of the design. When the external pressure is not stable enough, the external stiffening can improve the ability of the steel pipe to resist external pressure. According to the form of stiffening components, the buried type Steel pipes can be divided into two categories: stiffening rings and anchor bars (including anchor plates). Ring-shaped stiffening ribs have a significant effect on improving the ability of steel pipes to withstand external pressure. The engineering community also has rich experience in designing such steel pipes.