Dynamic Responses of Float-over Barge Subjected to Random Waves

float-over method has been widely utilized in offshore construction
industry. This technique demonstrates significant advantages over the
conventional lifting installation especially in remote areas where heavy
lifting crane barges are unavailable and topside weight exceeds the
lifting capacity of the floating crane. In order to ensure smooth floatover
operations, the responses of the float-over barge due to waves are
crucial and must be determined. In this paper, the experimental results
on the scale model of float-over barge are presented, analyzed and
compared with those from theoretical analysis using developed
computer programs and simplified approach using frequency domain
dynamic analysis. The model tests were conducted on a model
following Froude scaling law with geometric scale of 1:50. Random
wave sea states were specified for the test and the results are presented
in terms of Response Amplitude Operators (RAOs). The model tests
were conducted in a wave basin with simulated ocean environment
under random waves and the dynamic responses in terms of motions of
the barge were monitored during the tests. The test results were
compared with theoretical values obtained from analysis and
conclusions arrived at. Overall results show satisfactory agreement
between model tests and theoretical analysis.
KEY WORDS: Float-over barge; Response Amplitude Operators;
Model Tests; Theoretical Analysis