Response of an offshore structure to random ice forces

The paper describes a probabilistic dynamic analysis of the response of a fixed offshore tower, idealized as a lightly damped multi-degree freedom system, to ice floe loading assumed to be stationary and ergodic. Digitizing typical force inputs from available records, e.g. Cook Inlet, Alaska, and assuming that Gaussian excitations produce Gaussian responses, power spectral densities of the displacements are obtained. The work forms part of a continuing research project on ´Stochastic Analysis of Ice-Structure Interaction´ at Memorial University of Newfoundland and is an extension of an earlier investigation on a single-degree-of-freedom system.