Design Sensitivity Analysis of a Steel-concrete Double-leaf Blast-resistant Door to Determine the Steel Ratio

Blast-resistant doors are application-specific structures that are installed at the entrances of protective facilities and used to protect lives, important equipment, and critical materials from blast pressure. In this study, based on flexural performance, the design sensitivity of a steel-concrete double-leaf blast-resistant door with regard to variables such as rebar ratio and steel plate thickness is analyzed by comparing deflection, internal energy, and stress. The results revealed that differences in performance based on variations in the rebar ratio are insignificant. However, with respect to plate thickness, the difference in maximum deflection was greater than 26%. The results also showed that designing a steel box as a structural member is more effective than simply using it as a formwork. The appropriate value of the variables was found to be 10 mm for the plate thickness and D10 for the rebar. The results also showed that the strengthening level of the door itself was higher, and the structural performance of supporting members such as hinges and latches should be improved. Keywords: Blast-Resistant Door, Design Sensitivity, Structural Behavior, FE Analysis