Performance Investigation of a Reinforced Concrete Reservoir Containing Fluid by Considering Fluid-Structure Interaction (FSI) under Blast Loading by LBE Method

In light of the importance of reinforced concrete reservoirs, as well as the increasing number of terrorist attacks, this study attempts to evaluate the performance of reinforced concrete reservoirs containing a fluid with response to TNT explosion at different distances while considering the Fluid-structure interaction (FSI) in relation to the loading impact from the blast wave. The LBE method in the LS-DYNA software was used for this research. The amounts of TNT used are 20, 40, 60, and 80 Kg at distances of 3, 4.5, 6 and 7.5 meters from the top of a concrete reservoir in simulated buried and non-buried situations. One of the most important results of this research is an increase of 14%, 33%, 35% and 41% of pressure in the blast impact on the reservoir with respectively 1.2, 1.4, 1.6 and 1.8 times of the TNT amount in the buried situation at a distance of 3 meters. Furthermore, the maximum pressure on the reservoir in the buried state at a distance of 3 meters was associated with an increase of 13%, 23%, 30% and 36%, respectively. The simulation results also illustrate the effect of soil as a protective cover in reducing the blast impact on the reservoir.