چكيده به لاتين
Progressive collapse is a branch of research that has received a great deal of attention in recent years. The importance of this issue is such that in the last ten years, while the subject of design has been introduced against the progressive collapse of many design regulations, special instructions have also been prepared and compiled, which have been edited and revised several times during this period. Current standards used to design structures against normal loads generally use some degree of strength and ductility in a structural system to withstand sudden loads and prevent progressive collapse. This study examines the truck's collision with the columns of a four-story steel structure with a dual lateral bearing system in one direction and a bending frame system in the other. For this purpose, first the mentioned structure is modeled in ETABS software and then to simulate the vehicle's collision with the structure, simulation in ABAQUS finite element software is discussed. To validate the process of modeling the impact on the steel column, the existing laboratory results in the field of impact with the steel column have been used. Various analyzes have been performed to investigate the parameters of the striker mass, the striker rate, the impact position of the striker and the position of the affected column. The results showed that with increasing mass and speed of the striker, damage to the affected column and structure increases. Also, the position of the striker from the ground has a significant effect on the amount of damage caused to the column and the structure, so that by increasing the height of the striker from the ground, the damage is directed from the bottom of the column to the top of the column. The results also show that corner columns are more vulnerable to impact and progressive collapse than side columns, and braces have a positive effect on reducing the amount of damage in the structure, so that the presence of braces parallel to the impact reduces damage and deformation in the affected column.
