Dynamic Response and Parameter Analysis of Box-Plate Steel Structure under Impact Load

Based on the finite element analysis method, this study systematically investigates the influences of key parameters, including impact position, axial compression ratio, wall plate thickness, and impact energy, on the impact resistance and progressive collapse behavior of a three-layer double-span box-plate steel structure. The results show that the damage degree of the side wall is significantly higher than that of the middle wall given the same impact energy. The presence of a T-rib structure on the impacted surface results in a more pronounced dynamic response. Larger structural openings at the impact site substantially reduce the overall damage severity. When the impact occurs near a multiwall intersection area, the extent of damage decreases inversely with the number of intersecting walls. Additionally, given the increase in the axial compression ratio, the angle response of the structural collapse discriminant members increases significantly. Given the same impact energy, the intensity of structural dynamic response is positively correlated with the impact mass and negatively correlated with the thickness of the wall panel. The research reveals that the box-plate steel structure exhibits good overall cooperative performance and resistance to progressive collapse, delivering reliable safety performance given medium-to-high energy impact loading conditions around the order of 10 4 kJ.