During the service period, the mooring rope will get broken wires inner or outer because of corrosion, attrition, distortion and bending fatigue. This paper provides a calculation formula of steel wire strength and a calculation method for residual strength. Simplify the inner structure, which is convenient for calculation. Consider the friction influence among the wires and the probability distribution of broken wires. Provide the wire distribution probability model. Basis on the calculation result to get the confidence interval, then get the extent of mooring rope residual strength.

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