Research on Mechanical Properties of Multi-point Integral Lifting Process of LNG Storage Tank

The inversion hydraulic lifting technique of computer multi-point control was used for the construction of a LNG storage tank. During the lifting process, due to the long span, thin wall and heavy mass of the tank, the tank wall was prone to deformation and even instability damage during the lifting process, so it was necessary to conduct mechanical simulation of the lifting process. ABAQUS was used to establish the finite element model of the tank body and simulate the asynchronous lifting caused by the lifting error under the construction state, it was found that there was a 12.9% probability of occurrence of stress concentration, which would result in local buckling of the structure. The improved model based on expanding circle method was established and compared with the asynchronous lifting results, the results showed that the maximum stress of the structure should be reduced to 135 MPa, so as to meet the requirements of structural stability.