Study on the residual ultimate longitudinal strength of hull girder of a bulk carrier against a sagging moment after ship collision

The purpose of this study is to investigate residual Ultimate Longitudinal Strength (ULS) of a panamax bulk carrier being subjected to sagging moment. ULS of panamax bulk carrier in intact condition is estimated using large-scale nonlinear FEM analysis code LS-DYNA as well as simplified analysis method based on the Smith method. ULS in intact condition estimated by FEA is compared with that estimated by simplified method. It can be found that ULS estimated by FEA and that by simplified analysis show a fairly good agreement although small discrepancy can be seen. Moreover ULS in damaged condition is estimated assuming collision at midship region of the side shell, where damaged area is artificially created as a first phase of the research project.