RESPONSE STATISTICS OF MOORED OFFSHORE STRUCTURES

This paper discusses the prediction of extreme values for total first and second-order responses of a floating structure moored in random se as. It is hard to estimate the extreme values from time series simulat ion or experimental data of limited length. Several methods of theoret ical estimation of the extreme values are examined. They are the SRSS formula introduced by Naess (1987, 1989), the modified SRSS with; a co rrelation parameter, the SRSS with Naess (1987, 1989) corection factor , the approximate SRSS (Naess, 1989), and the formula proposed by auth ors previously. The results of those methods are compared, and it is c onfirmed that the last one is very promising.