Protective Facility ISSN:3058-7816(Print) 3058-8618(Online) 방호시설

In this study conducts blast simulations of an igloo-type ammunition magazine using the Extreme Loading for Structures (ELS) program based on the Applied Element Method (AEM) and evaluates the structural damage behavior and protective performance under explosive loading. Unlike conventional analyses based on the Finite Element Method (FEM), AEM connects adjacent three-dimensional elements through discrete spring elements along their contacting faces. This modeling approach allows partial separation of the connecting springs, enabling realistic simulation of crack initiation and propagation, member separation, and progressive collapse mechanisms. Consequently, AEM-based analysis is expected to provide a more realistic representation of structural response under blast loading. The blast scenario was defined as a front-side surface explosion, and the blast loads were determined in accordance with UFC 3-340-02 based on the equivalent TNT charge weight and standoff distance. The analysis results indicate that localized concrete micro-cracking and yielding of vertical reinforcing bars occurred in the front wall; however, no concrete crushing or damage compromising the overall structural stability was observed. The maximum deflection was identified at the upper region of the opening in the front wall, and the corresponding member rotation angle was evaluated to be within the allowable limits for Protective Level 2-B. Accordingly, the structure was assessed to satisfy the required protective performance. The results of this study demonstrate that AEM-based blast simulation can effectively capture crack development, reinforcement yielding, member deformation, and damage transition processes induced by explosive loads. It is therefore expected that this approach can be effectively applied as an effective analysis technique for performance assessment and design verification of protective structures such as ammunition magazines.