This paper investigates the integral lifting and launching technology for a new type of offshore floating photovoltaic （FPV） modular support structure. Based on the finite element software ANSYS, numerical simulations of the entire lifting and launching process of the support structure into the water were conducted. Through comparative analysis, an optimized selection scheme for the bottom components of the modular support structure was determined. The construction processes of two-point lifting, three-point lifting, and four-point lifting were analyzed and compared to identify the optimal lifting point arrangement for the modular support structure. The influence of errors, such as the position of lifting lugs and the length of lifting cables, on the internal forces and deformations during the lifting process of the modular support structure was emphatically analyzed, and corresponding error control indices were proposed. The analysis results indicate that the four-point lifting condition with lifting points at the trisection points of the long sides is optimal. When the position error of the lifting lugs exceeds 10 mm, the uneven difference in the internal forces of the lifting cables exceeds 57%, suggesting that the position error of the lifting lugs should be controlled within ±5 mm. When the length error of the lifting cables exceeds 67.5 mm, the overall structural deformation reaches 77 mm, and the vertical deformation difference of the structure exceeds 35 mm, recommending that the length error of the lifting cables be controlled within 67.5 mm.

offshore floating structure  /  error analysis  /  numerical simulation  /  integral lifting  /  composite support structure  /  construction stage analysis