Analysis of The Impact of Explosive Load on Confined Square Concrete Columns Enveloped with FRP

In this research, we investigate the behavior of square concrete columns reinforced with FRP (Fiber-Reinforced Polymers) under explosive loading. To achieve this objective, we first reviewed previous studies and selected a reference paper for result validation and simulation in the ABAQUS software. The reinforced concrete column in our study was subjected to an explosive load equivalent to 682 kilograms of TNT at a distance of 6.1 meters. We extracted and compared the displacement at the center of the column with the results presented in the reference paper to validate our simulations. Furthermore, we examined 12 other specimens strengthened with FRP sheets in this research. These 12 specimens were categorized into four groups, each with one parameter variation. In the first category, we varied the thickness of the FRP sheet from 1 to 3 millimeters. In the second category, we altered the orientation of the fibers, using angles of 0, 22.5, and 45 degrees. In the third category, we changed the arrangement of the FRP sheets, including full coverage, one-third on the top and two-thirds on the bottom, and a model with one-third in the middle. Finally, in the fourth category, we varied the column length from 2 to 5 meters, and we investigated how these parameter changes affected the performance of the reinforced column against explosive loads. For the first model with a 1- millimeter thick reinforcing FRP sheet, we obtained a displacement of 35 millimeters. In the second model, where the thickness ranged from one to two millimeters, the center displacement of the column was 28 millimeters. Detailed results for the other models are presented throughout the study.