Description of loading conditions due to violent wave impacts on a vertical structure with an overhanging horizontal cantilever slab

► A vertical structure with an overhanging cantilevering slab is tested under loading conditions of violent wave impacts. ► Impact pressures and forces are non-repeatable under nominally identical conditions. ► Waves are classified into four breaker types according breaker shapes. ► The largest peak pressure is recorded at the fixed corner of the cantilever slab (123 kPa). ► The presence of a horizontal part increases the vulnerability of the vertical part.