Based on power strain hardening assumption, analytical solutions of ultimate bending capacity of offshore pipeline are presented. Analytical solutions with elastic-perfectly plastic assumption are provided as well. The proposed methods are able to account for the combined actions of internal pressure, axial force and bending moment. Good agreement is observed when ultimate bending capacities obtained from analytical solutions are compared with experimental results.It is shown that strain hardening pipes yield higher bending capacity than that of pipe with elastic-perfectly plastic material, and the ignorance of strain hardening, as commonly assumed in current code, may underestimate the ultimate bending capacity of steel pipes. The solutions presented in this paper are applicable in the structural design and safety evaluation of offshore pipelines.%基于幂次强化模型，给出了内压和轴力作用下海底管道极限弯矩承载力计算方法，并给出了极限承载力理想弹塑性模型解析解，编制了海底管道极限承载力计算程序 BCP。通过算例，研究了内压和轴力对幂次强化海底管道极限弯矩承载力的影响规律，并与试验结果进行了对比，验证了解析解的合理性，可以为海底管道的结构强度设计和安全评价提供参考。
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