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-The first-yield collapse of submarine pipelines with an initial out-of-roundness imperfection un-der combined bending and external pressure load is formulated by means of the Von.Mises yield criterion.The formula reduces to Timoshenko and Gere’s expression in the case of external pressure load alone.Theinfluence curves of various parameters on the yield strength are presented,the collapse of submarinepipelines in a deep water region is numerically predicted,and the effect of pre-yield nonlinear bending onthe yield strength is also examined.
-The first-yield collapse of submarine pipelines with an initial out-of-roundness imperfection un-der combined bending and external pressure load is formulated by means of the Von. Mises yield criterion. The formula reduces to Timoshenko and Gere’s expression in the case of external pressure load alone. The effects of various strains on the yield strength are presented, the collapse of submarine pipelines in a deep water region is numerically predicted, and the effect of pre-yield nonlinear bending on the yield strength is also examined.