Some researchers have already studied the behavior of RC columns under surface burst [
4–
8]. Blast parameters which change the RC performance are the shape of structures and geometries, standoff distance, the part of the structure facing toward the blast load, and the opening of the structures [
9–
11]. Ngo et al. [
12] claimed two most important parameters describing the severity of the damage are standoff distance and the charge weight. Almusallam et al. [
13] studied the blast performance of an eight-story building framed with RC structure. He showed those columns experiencing reflected pressure as they were placed toward the blast waves, received the most damage. Steel bars in those columns were damaged, and the concrete fragmented. Consequently, with no load-bearing capacity, the gravity loads initiated some partial collapse. Remennikov [
14] compared some analytical approach with numerical techniques to predict blast loads. He determined the limitation and simulated a simple explosion test. Calculating the blast pressure using UFC standard allowed Remennikov to apply directly to the structure [
15]. He modeled the structure but not air nor the charge. Simulation with no air elements was very computationally efficient and required less time. Baylot and Bevins [
16] conducted an investigation on a RC column subjected to blast loads. The study consisted of both experimental and numerical approaches, and reports including modelling details of structural configurations and experimentally observed results at various locations of the RC models.