The residual capability of damaged warships is one of the important aspects of its residual strength assessment. The calculation method of ultimate longitudinal bending moment was based on the Smith method. Then, a method to calculate the statistical characteristic values of residual capability of damaged warships was presented, in which some uncertainties, such as the size of broken holes caused by weapons, material mechanical properties of the steel and the size of structures, etc, were considered. The ultimate longitudinal bending moment of Reckling No.23 model was calculated and compared with the result from the literature, the result is quite satisfactory. With a warship as an example, the statistical characteristic values of residual capability of the damaged ship hull were calculated, and some factors which may evidently affect the residual capability were investigated.

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