Accumulation of Permanent Deflection of Steel Plates Subjected to Repeated Slamming Impact Loadings

Slamming phenomenon unavoidably occurs on marine structures while in service. The extreme slamming events induced repeated impact pressures can cause damage to the structures and possible crew and compartment casualties. This paper presents investigations of accumulated damages of steel plates subjected to such repeated loadings. The numerical analysis model was developed, in which the load input was as the impulse-triangular profile simplified from the test slamming pressure time history data. The developed analysis model was validated by a comparison with test data. Subsequently, a parametric study on steel plates with actual scantlings used in marine applications was performed. Key parameters in estimating the permanent set of marine plates due to repeated impact pressures were then identified. Accumulation of the plate’s permanent deflection under repeated slamming loads was evaluated accordingly.