Progressive Collapse Analysis of a Ship' s Hull Girder under Longitudinal Bending considering Local Pressure Loads

A method of progressive collapse analysis of a ship's hull girder under longitudinal bending developed by the first author is extended in order to take local pressure loads into account. First, the average stress-average strain relationship of the plate elements subjected to combined thrust and lateral pressure is formulated in an analytical manner. Then, based on the equilibrium conditions of forces and bending moments considering the influence of lateral pressure, the average stress-average strain relationship of stiffener elements with attached plating is derived. The proposed analytical procedure is then verified through the comparison of the calculated results with those by the FEM analysis for both plate and stiffener elements. Finally, developed formulations are implemented into the computer code “HULLST”, and the modified code is applied to the analysis of collapse behaviour and ultimate hull girder strength of MV “Energy Concentration.”