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In current specifications, it is assumed that the structural performance is the same if the same deflection occurs, regardless of the structural characteristics or explosive conditions. However, depending on the structural characteristics and explosion conditions, structural responses may differ. Therefore, flexural deflection and shear need to be considered. In this study, the differences in the structural behaviors of steel-concrete sliding-type blast doors in the impulsive, dynamic, and quasi-static regions were analyzed using the finite element method. The results showed that in the impulsive region and under significant impact forces, shear failure occurred at the initial behavioral step, and the door was more vulnerable to shear than in the dynamic and quasi-static regions. Furthermore, in the impulsive region, a relatively large deformation occurred in the wheel installed on the lower part of the door, affecting functionality, such as opening and closing. Because combined flexural-shear and direct shear failures cause more damage than flexural failure, they must be considered during the design process, and further studies are required to develop a generalized evaluation method and design criteria to reflect the shear effect.

Finite Element Analysis of Structural Behavior of Sliding-Type Blast-Resistant Doors Based on Blast Loading Conditions