中文摘要：

本文对国内外常用的埋藏式压力钢管加劲环抗外压稳定的计算方法进行了比较研究。结果表明：采用规范DL/T 5141—2001中（B16）式的设计结果偏于保守;而规范DL/T 5141—2001附录中（30）式是对Svoisky方法的错误表达,可能得出偏大甚至错误的加劲环临界外压值;Jacobsen方法不仅克服了Amstutz方法适应范围的局限,而且克服了Svoisky方法未考虑等效翼缘以外管壁上外压力的不足,经过比较最终建议采用Jacobsen方法,并为求解Jacobsen公式提供了一种有效的计算思路。

英文摘要：

This paper presents a comparison study on the existing common methods for calculation of stiffener ring buckling of embedded steel penstocks under external pressure. The results indicate that the critical external pressure of stiffener ring obtained from equation（B16） in the design codes DL/T 5141—2001 is conservative. Equation（30） in the appendix of the codes is an incorrect expression of Svoisky＇s method and it may lead to a too large or even wrong estimate for the critical pressure. Moreover, Jacobsen＇s method not only overcomes the limitation in the adaptation range of Amstutz＇s method, but avoids the shortage of Svoisky＇s method that fails to consider the external pressure of shell beyond the equivalent flange. Thus Jacobsen＇s method is recommended and an effective calculation thought for solving the Jacobsen＇s formulas is given.