A series of collapse tests were performed on box girder models to evaluate the effect of collision damage on the residual longitudinal strength of the hull girder. The experiments were carried out under pure bending moment using, so-called 4-point bending test method, the load, deflection and strain were measured. Ten experimental models were fabricated, two of them were intact, four were plastically damaged and four were fracture damaged. To generate the damages, lateral collision tests were firstly performed on the box girder models. To consider the effects of ship speed and relative draft on extents of damage due to collision, the drop height and impact location of striker were changed for each model. Numerical analyses were also performed by applying nonlinear finite element analysis. In the numerical analysis, the measured initial imperfection data and the welding residual stresses were considered.

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