为校核螺旋屈曲管柱的强度安全性，基于弹簧理论与第四强度理论，推导出螺旋屈曲状态下管柱内、外侧相当应力的计算公式，并以油田常用规格油套管为例，探讨了轴向压力对管柱内、外侧最大相当应力的影响。算例结果表明，螺旋屈曲管柱内侧最大相当应力恒大于外侧；管柱内、外侧最大相当应力随轴向压力的增大而增大。轴向压力由200KN 增大至800KN 时，管柱内、外侧最大相当应力分别增大170%和413.8%。研究弥补了传统管柱力学分析的不足，提供了螺旋屈曲管柱安全性研究新方法，同时也可为现场安全施工提供参考。%To make clear stress distribution and variation of helical buckling tubing string, the formulas of equivalent stresses inside and outside of the tubing string were deduced based on the spring theory and the fourth strength theory. Taking tubing string and casing commonly used in oilfield as object, stress calculation programs were compiled to explore the influence of axial compression load on equivalent VonMises stress. From the analysis, we can see that the equivalent VonMises stresses inside of the helical buckling tubing string were higher than that outside. The equivalent VonMises stress increased with the axial compression load, and the increase is 170 percent and 413.8 percent respectively for stress inside and outside of the tubing string with compression load increased from 200KN to 800KN. The proposed method used for the helical buckling tubing string covered the shortage of traditional tubular mechanics effectively and can also provide reference for the field application.
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