为了了解螺旋弯曲状态下管柱的应力分布规律，根据管柱螺旋弯曲的特点，利用弹簧理论，结合螺旋弯曲管柱力学分析成果，导出了螺旋弯曲状态下管柱内、外侧的第四相当应力计算公式，弥补了传统管柱力学分析的不足，提高了受压弯曲管柱强度校核的针对性与准确性。分析结果表明，在轴向压力作用下，弯曲管柱内侧的最大相当应力恒大于外侧，并且随着轴向压力的增大，管柱内侧最大相当应力线性增大。因此，对于受压弯曲管柱，应以管柱内壁为应力危险．占校核苴碾序．%To understand the stress distribution law of pipestring in the state of helical buckling, the method to calculate the fourth phase equivalent stress of the inner and outer walls of pipestring in helical buckling was derived considering the features of helical buckling string, adopting the spring theory and referring to the dynamic analysis achievements of the string. This study makes up for the weakness of traditional dynamic analysis of pipestring and improves the pertinence and accuracy of checking the strength of pressurized buckling string. The analysis shows that under the effect of axial pressure, the maximum equivalent stress of the inner wall of the string is always grea- ter than that of the outer wall. Moreover, the maximum equivalent stress of the inner wall within the string increases linearly with the increase of axial pressure. Therefore, as for pressurized buckling string, the inner wall of the string should be taken as the dangerous point of stress to check the strength.
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