Finite element models for pipelines with different diameters and thickness was establisted,and local buckling was analyzed for these large diameter pipelines with thin thickness under moment effect. The moment resistance factor was defined,and the relationship between the moment resistance capacity and the ratio of pipe diameter to thickness was established.%利用有限元软件建立了不同管径、壁厚组合条件下的数值分析模型,开展了大口径薄壁海底管道在弯矩作用下的局部屈曲分析,得出了管道径厚比对管道屈曲承载力的影响程度.通过引入弯曲抗力系数,建立了海底管道局部屈曲弯矩抗力系数与管道径厚比的关系.
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