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The twin-barge floatover method can efficiently utilize two barges to install the mega topside installation. However, the twin-barge floatover system involves hydrodynamic and structural interactions of multiple bodies. In this study, a numerical model is developed for predicting motions and loads of the twin-barge floatover system in beam waves during load transfers. The effects of multibody hydrodynamic interaction and mating loads on various connections and constraint components are considered. The motion equations of the multiple bodies, together with the coupled stiffness matrix, are derived. The numerical results are compared with the experimental results in beam waves. Results indicate that the proposed numerical model can provide accurate and reasonable predictions of the twin-barge floatover installation.

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