Structure safety analysis and optimization of refuge chamber shell under explosion load

In order to obtain refuge chamber shell structures with the requirements of high strength, low weight, and enough volume, the basic dimensions of the shell structure were first determined on the basis of statics analysis and steel pressure vessel standards. Following that, four shell structures with detailed dimensions reinforcing rib were designed, including shell with internal steel, internal rectangular tubes, external steel, and external rectangular tube to prevent failure. The explicit nonlinear dynamic analysis program was used to simulate the response of the four types. A shock wave of 300 ms duration and 1.0 MPa at its highest value was applied to the shell. The maximum displacement was less than 20 mm, located in the central part of sides and the outer space of portals. The maximum stress was below the strength limit, located in an intermediate position and on the corner of reinforcing rib. The calculations indicated that none of the four structures demonstrated deformation failure or strength failure. This shows they are able to meet safety requirements. Simulations were conducted to verify the results. The situation suitable for each shell structure was demonstrated in the simulation results. A small cabin might be built with the external rectangular tube, and a medium-sized cabin with internal steel. Large cabins may be constructed using internal steel and the external rectangular tube. The impact performance of the shell structure can be optimized if the weak link is locally strengthened.