冲击荷载下大型LNG储罐混凝土外罐的数值模拟

To obtain the dynamic response of large full-capacity liquefied natural gas(LNG)tanks under impact loads and its law of the external concrete wall, an elaborate finite-element (FE) model of a LNG outer tank under impact loading was established using an actual LNG tank project as a basis and ANSYS/LS-DYNA FE software as an analytical platform. A Tomahawk cruise missile was considered the impact object, and the internal force, deformation, and law of the tank structure were analyzed. The failure mode of the structure under the impact load was also summarized. The impact test results verified the numerical simulation method of this paper and its applicability under impact loading against a concrete target. The prestressed steel provided at the tank wall improved the ability of the structure to resist the impact load. Further analysis demonstrated that the impact damage of the LNG outer tank can be divided into three types: local dent, peel-off of the concrete surface, and breakdown. Weak positions were observed at the connections between the tank dome and the outer wall and between the outer tank wall and the floor. These results provide a basis for the future anti-impact design of tank structures.