Author(s): S. H. Iyer

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Abstract: A state-of-the-art review of local loads due to ice action on fixed offshore structures and floating vessels is presented in this paper. Local ice loadings present a serious challenge to their design and operation. The present review indicates that the existing technology for local pressures is far from satisfactory. There are no well-established design procedures for ice-induced local loads for offshore structures. Some design procedures do exist for icebreakers. However, large differences exist among all these and their applicability to fixed offshore structures is always a problem. Local pressures are considered in terms of pressure and contact area. Current procedures for local pressures are mostly empirical and are mostly based on small-scale indentation tests. Extrapolation to design areas is done considering the size of the contact area. The review presents salient details of the available techniques. Most of the techniques indicate that the design local pressure decreases with increase in the contact area. However, there is widespread discrepancy in the design pressures obtained by using these methods. The paper presents an evaluation of the various techniques, the design considerations associated with various ice and structural conditions and the design implications from a structural point of view. Finally recommendations for future investigations have been presented.

DOI:

Year: 1988