2002 Volume 2002 Issue 696 Pages 77-84
This paper provides general theory of nondeterministic analysis of practical offshore structures subjected to the wave, that is located parallel to the wave direction and possess wide spans, multiple-piles, horizontal and slant bracing. In accordance with linearized equation of motion, its structural responses can be obtained by the random vibration approach. The linearized wave excitation matrix consists of cross-spectral density function of wave height, which is the product of one-dimensional sea spectrum and directionality function. To account the fact that the same wave forces do not occur simultaneously over the entire structure, a hydrodynamic admittance, the products of average values of directionality function, is introduced. It is suggested that the hydrodynamic admittance have significant contributions on the dynamic response of the offshore structures.
