| With the increasing need of the deep-water oil and gas resources, more and more offshore drilling and production platforms are widely used in offshore oil and gas production service. How to install these platforms safely has been the focus of the offshore industry. In general, offshore platforms installation operation consists of two parts: installation of topside and the tower. The installation of topside has been the main issues of the whole installation process. There are multiple ways to install these offshore platforms. The category of various offshore installation technologies defines the major two methods: single barge scheme and twin barge scheme. Twin barge floatover method has been more and more used in recent years. Before the floatover installation, confirming the wave motion response of the platform is essential. It's more complex to predict coupling motion response in the presence of multiple floating structures. Therefore, determining the motion is very important during the offshore installation. If the problem is solved, the risk of installing marine floating structures will be diminished.In this paper, float-over method in widely used in engineering were systematically summarized. The main float-over methods were described in detail both on the advantage and disadvantage. The applications in offshore engineering and the current progress in recent years were also summarized. The future research directions in this field are also discussed. To systematically study the motion response of floating bodies. The motions response of a single floating body in regular waves has been studied in the present paper. It shows that the computed results agree well with the measured ones. Then the motion of S7-175 container ship is calculated. It proves the code's accuracy by comparing the results calculated by the STF method. Hydrodynamic interaction of twin-barge for offshore float-over installation is investigated based on 3-dimentiaonl potential theory. Hydrodynamic forces and wave forces acting on two aligned floating bodies were calculated and the results are compared with that of reference. Hydrodynamic forces and wave forces on twin-barge for offshore float-over installation are predicted. It shows that the computed results agree well with the measured ones and the theoretical prediction is useful for offshore float-over installation. At last, floatover installation in regular waves by frequent domain method simulation is investigated which can be applied for the reference for the platform installation by twin barge floatover method.
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