In this paper, a numerical model describing launching of offshore jackets from barge is developed. In addition to commercial software’s, water entry forces on jacket members and an implicit Newmark solution technique are included in the model. The results are in general agreement with other numerical software’s available (SACS). Special attention is paid to the fluid forces acting on jacket and the importance of each one. Also it is observed that water entry forces on horizontal jacket elements are very significant and may locally govern the design of these members. This force is more important for horizontal slender members near the mud-line, which do not experience significant environmental loading in operating conditions. Therefore the water entry impact force with large magnitude can cause over-stress and/or ovalling. It is also observed that taking water entry forces in account modifies the jacket trajectory in little extent.

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