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本文基于NSC（NetSectionCollapse，净截面垮塌）准则建立了拉弯组合受载条件下周向埋藏裂纹厚壁管的塑性极限载荷状态受力模型，并由此获得了周向裂纹管塑性极限载荷的通用解。利用通用解，考察了各主要因素对裂纹管承载能力的影响，并导出了在不同受载条件（纯拉、纯弯及拉弯组合载荷）下，不同裂纹构型（表面裂纹、埋藏裂纹、穿透裂纹及复杂裂纹）的周向裂纹管塑性极限载荷计算式。
Based on the criterion of NetSectionCollapse (NSC), this paper establishes a plastic limit state of load model for a thick-walled tube buried in the circumferential direction under tension and bending load conditions, and obtains the universal plastic limit load for a circumferential cracked tube solution. The influence of the main factors on the bearing capacity of the cracked tube was investigated by means of the generalized solution. The influences of different loading conditions (pure, pure and combined bending and bending) Penetrating Cracks and Complex Cracks).