عنوان مقاله [English]
This paper presents a study of the structural behavior of the Air Force Shelters with different geometric properties. Generally the shelters are reinforced concrete shells internally covered by profiled steel sheeting. These structures were designed based on the UFC regulation. In addition, the design process did not considered the increase in structural strength offered by the profiled steel sheeting or accidental loads such as explosion near the structure. The aim of this paper is to compare the structural response of the shelters with different geometry under near field blasts. The highlight of this research is to utilize concrete damage plasticity to determine the damage evolution in the critical regions by ABAQUS software. Three prevalent architectural forms of the shelters includes semi cylindrical, hexagonal and trapezoidal shapes are considered under 2 surface blast scenario in the 5 and 10 meters distance. Conwep model is selected to simulate the explosion of TNT charge of 545 Kgs. The results of the numerical studies show that the maximum damage rate is belong to trapezoidal shape and the semi-cylindrical form is the most applicable form to minimize the vulnerability under explosive loads.