An interactive frequency domain method of analysis is presented for determining the response behaviour of Guyed Offshore Towers to low-frequency, second-order wave drift forces generated in a random sea environment. For the response analysis, the tower is idealized as a shear beam with a rotational spring at the bottom support. The guylines are replaced by a non-linear spring. The second-order drift force is considered to be proportional to the square of the wave elevation and is simulated using a drift force coefficient and the time history of a slowly varying wave envelope in random sea. The responses due to drift forces are obtained in frequency domain by incorporating the non-linearities produced due to non-linear guy lines. An example problem is solved under different random sea states to compare the response behaviour of the tower obtained by the second-order wave force, the first-order wave force and a combination of the two.
Second-order drift force response of offshore guyed towers
Abdriftkräfte zweiter Ordnung von verankerten offshore-Plattformen
Ocean Engineering ; 22 , 3 ; 251-270
1995
20 Seiten, 20 Bilder, 2 Tabellen, 25 Quellen
Aufsatz (Zeitschrift)
Englisch
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