Numerical Modeling and Dynamic Response of 160,000-m3 Liquefied Natural Gas Outer Tank under Aircraft Impact

Abstract

To investigate the dynamic responses and damage modes of the dome of a liquefied natural gas (LNG) storage tank under aircraft impact, a finite-element (FE) model of a 160,000-m3 LNG storage tank for an actual LNG project and two kinds of aircraft was established. Through comparison of the results of a numerical simulation and an impact perforation test, the accuracy of the numerical simulation method and the material model were confirmed. The FE model of the aircraft also was validated, based on the Riera method. The dynamic responses and failure phenomena of the dome and wall of the LNG tank under aircraft impact were studied, respectively. Based on the simulation results, the influence of the reticulated shell on the antishock capability of the dome was evaluated. The numerical results revealed that the LNG outer tank was able to resist the impact of a Bombardier Challenger 850 and a Boeing 757 flying at 100 m/s; the ability to withstand shock loading was improved greatly by the combined effects of the concrete and reticulated shells. However, when the Bombardier Challenger 850 aircraft hit the tank wall at 100 m/s, the aircraft penetrated into the LNG outer concrete structure. More seriously, when the Bombardier aircraft hit the ring beam, in addition to the penetration damage at the direct impact site, there was a wide range of collapse near the breakdown hole, and the structure was severely damaged.