Combining Reduced-Order Stick Model with Full-Order Finite Element Model for Efficient Analysis of Self-Elevating Units

Reduced-order stick models are frequently employed to obtain dynamic amplification factors of self-elevating units (SEU), while the full-order finite element (FE) used for quasi-static analyses. This paper develops an efficient framework create structural digital twins SEUs by combining both and FE models. A model a detailed in-house developed generic SEU established, respectively, following standard industry guideline. Dynamic analyses performed based on modal superposition method. Assuming that contains key characteristics model, participation multiplied corresponding mode shapes full derive global responses entire SEU. The derived nodal displacements imposed member stresses. stresses benchmarked with results from direct analysis various environmental conditions. presented is found significantly increase efficiency simulation retaining similar accuracy, it forms critical step ongoing development fixed offshore structures.