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Title: Experimental investigation on the development of wear in grouted connections for offshore wind turbine generators
Authors: Dallyn, Paul
El-Hamalawi, Ashraf
Palmeri, Alessandro
Knight, R.
Keywords: Grouted connection
Integrity assessment
Offshore structures
Wear development
Wind turbines
Issue Date: 2016
Publisher: Elsevier Ltd (© The authors)
Citation: DALLYN, P. ...et al., 2016. Experimental investigation on the development of wear in grouted connections for offshore wind turbine generators. Engineering Structures, 113, pp.89–102
Abstract: Relative displacements between grout and steel have been observed in grouted connections used for offshore wind turbine substructures, which appear to be linked to the unexpected settlements that have occurred in some offshore wind farms. A literature review has highlighted a lack of understanding of the implications that this relative movement has on the grout wear. Experimentation has therefore been undertaken to determine the influence of various factors on the wear development, including compressive stress, displacement amplitude, surface roughness and the presence of water, looking at conditions typically experienced by offshore grouted connections. These experiments have indicated that wear of the steel and grout surfaces occur, even at low magnitude compressive stresses. The presence of water has the most significant impact on wear rate, being up to 18 times higher than for the equivalent dry condition. The presence of water can also significantly reduce the coefficient of friction to values lower than typically recommended for evaluation of grouted connections. These findings demonstrate that wear of the grouted connection is likely to occur over the life of this type of offshore structures and should therefore be considered when evaluating their integrity and assessing their behaviour.
Description: This is an open access article published by Elsevier under the CC BY license (http:// creativecommons.org/licenses/by/4.0/).
Sponsor: This study has been developed as part of the first author’s EngD (Engineering Doctorate) project, co-sponsored by the ESPRC (the UK Engineering and Physical Sciences Research Council) and E.ON, whose financial support is gratefully acknowledged.
Version: Published
DOI: 10.1016/j.engstruct.2015.11.028
URI: https://dspace.lboro.ac.uk/2134/19759
Publisher Link: http://dx.doi.org/10.1016/j.engstruct.2015.11.028
ISSN: 0141-0296
Appears in Collections:Published Articles (Civil and Building Engineering)

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