Abstract
The use of a floating crane barge for the construction of bridges built over the straits has many advantages such as being time-saving, economical, higher quality, and safety assurance. In this construction method the prefabricated girders are hoisted by the floating crane and installed on the designated place. Because this operation requires a very accurate positioning, oscillation of the floating crane due to long-period waves is critical element. This paper analyzed a fundamental characteristics of the oscillation of floating crane and coupled motion of a hoisted girder. The oscillation amplitudes of the observation and numerical analysis are compared. Finally, some weather downtime analysis of floating crane works are carried out at different sea conditions at an inland sea and at an open sea.
