Abstract: In a ship collision scenario, the damage on the oil tanker's side structure is closely related to the shape of the striking ship's bulbous bow, and the damaged structure should not be simplified as the volume of the damaged structure. In this paper, three typical collision scenarios are considered. A simplified analytical method for predicting the residual ultimate strength of the struck oil tanker is proposed based on the principles of analytical Smith method and the plastic-elastic deformation mechanism of the tanker's side structures. The proposed method is verified through a comparison between the experimental results of three typical box girders. The results indicate that the proposed method can successfully evaluate the residual ultimate strength of the struck oil tanker accurately and efficiently.