Dynamic Response of Single-storey Cold-formed Thin-walled Steel House Skeleton Under Impact Loading

A finite element model of a single-storey cold-formed thin-walled steel house frame structure was established using ABAQUS software to analyze the effects of different impact locations and impact angles on the dynamic response of the structure under a single impact load. Also, to establish a continuous impact model of single-storey cold-formed thin-walled section steel house skeleton structure at different locations and analyze the effect of two impact objects on the dynamic response of house skeleton structure under different impact time intervals. Combined with the basic theory of impact dynamics, the principle of the energy method was to determine the impact dynamic response analysis method of low-storey cold-formed thin-walled section steel housing skeleton structure under the impact-prone position, and put forward two measures to improve the impact resistance of cold-formed thin-walled section steel housing skeleton structure. The results show that: the lower node of the side column, the lower node of the middle of the wall and the lower middle point of the side column are the dangerous impact points of the housing skeleton structure; an impact angle of 90° (whether horizontal or vertical) represents the most critical scenario for the structure; the two impact objects acting at the same moment have the greatest degree of damage to the housing skeleton structure; after the side column is increased from double-limb to three-limb C-section steel collocation form, the impact resistance of the dangerous impact point of the side column is significantly improved, and the displacement is reduced by 37%; the addition of diagonal bracing at the side column of the impacted wall skeleton. The plastic strain energy of other members in the skeleton structure of the house is significantly reduced, and the displacement along the impact force direction is reduced by 18%.