Reinforcing doors of the safe structures using multi-arch geometric structure

In this paper, the performance of the multi-arched doors against explosion loads has been investigated using numerical modeling in LS-DYNA finite element software. Using the multi-arched structures reduces the used material weight and as a result, decreases the cost of building the door. Furthermore, this structure causes a more uniform stress distribution and reduces the stress concentration compared to conventional doors with a smooth surface. The parameters were studied in this research were the number of arches, the height of the arch, the weight of the explosive material, the dimensions of the door, the materials used in the construction of the door and the type of the hardened. The numerical modeling results show that by increasing the number of arch from one to five, the maximum displacement created in the center of the sample decreases by about 86%. By increasing the height of the arch from 5 to 10 and 20 cm, based on the number of different arches, the maximum displacement of the center of the door decreases between 5 and 32%. Among the different methods of strengthening the door, the multi-arch method increases the resistance. This method creates this resistance by consuming less steel and is more economical.