Fatigue behaviour of grouted connections at different ambient conditions and loading scenarios

Schaumann, Peter; Raba, Alexander; Bechtel, Anne

doi:10.1016/j.egypro.2017.10.373

Cited by 15 publications

(12 citation statements)

References 4 publications

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“…This is because it results in reduced friction between steel and grout, which can 291 effectively disrupt the performance of the joint [26]. According to recent studies [27], GCs tested in dry environment have superior performance when compared to GCs in wet conditions.…”

Section: Shear Key Numbermentioning

confidence: 99%

Non-linear finite element analysis of grouted connections for offshore monopile wind turbines

et al. 2019

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Section: Shear Key Numbermentioning

confidence: 99%

Non-linear finite element analysis of grouted connections for offshore monopile wind turbines

et al. 2019

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“…Fig.10). Executing the test procedure at an earlier stage of degradation compared to previous investigations of Schaumann and Raba (terminated at u ≈ 25 mm) [2] should give information on the chronology of compression strut failure and local crushing on fatigue damage initiation.…”

Section: Resultsmentioning

confidence: 99%

“…Investigating this, small and large-scale laboratory tests were performed at Leibniz Universität Hannover. Using the experimental test setup of previous investigations for special high performance grouts (HPG) [1,2], enables a direct comparison of HPG and OPC. Documenting liquid and solid OPC properties, like slump flow and compressive strength confirms a stable material quality.…”

mentioning

confidence: 99%

Axially loaded grouted connections in offshore conditions using ordinary portland cement

Henneberg

Schaumann

Raba

2018

Proceedings 12th International Conference on Advances in Steel-Concrete Composite Structures - ASCCS 2018

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A grouted connection (GC) is a hybrid connection which joins two telescoped steel tubes by filling the annulus between the steel tubes with grout. GCs are frequently used to enable a force fitted connection between piles and substructure of offshore wind turbines. At latticed substructures this connection is located at mudline level in wet ambient conditions (AC). Nowadays special grout materials are used to achieve not only best mechanical properties but also a good performance during grouting in offshore conditions. To reduce production costs the use of ordinary portland cement (OPC) is investigated as an alternative filling material within this paper. OPC has a much lower tendency to segregate, as there are no aggregates added. This leads to more simplified, stable and cheaper production processes offshore. Further focus is put on the failure mode of OPC filled GCs in submerged condtions. For an appropriate use of OPC offshore a feasible mechanical performance needs to be ensured. Investigating this, small and large-scale laboratory tests were performed at Leibniz Universität Hannover. Using the experimental test setup of previous investigations for special high performance grouts (HPG) [1,2], enables a direct comparison of HPG and OPC. Documenting liquid and solid OPC properties, like slump flow and compressive strength confirms a stable material quality. Small-scale ULS-tests showed significantly lower ULS-capacities and a more brittle failing process compared to HPG. Lagre-scale tests confirmed the observed failure mechanisms of Schaumann and Raba for OPC filled GCs in submerged conditions [3]. Carried out tests showed significant influence of grout material and confirmed influence of grout annulus size on fatigue capacity.

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“…2 This may lead to the development of wear in GC that potentially will cause severe damage and, thus, a reduced mechanical stability. [3][4][5] This observation motivates the development of structural health monitoring (SHM) systems to detect structural degradation in GC in an early state. Only few approaches are reported in the literature that aim at damage detection in GC.…”

Section: Introductionmentioning

confidence: 99%

Damage detection in grouted connections using electromechanical impedance spectroscopy

Moll

2018

Proceedings of the Institution of Mechanical Engineers, Part C:

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Grouted connections are structural joints formed by a cementitious grout cast between two concentric circular tubes. They are widely used in the offshore construction of oil and gas platforms, and for offshore wind turbines (monopiles and jackets). However, their application in offshore wind turbine installations can be critical due to the high bending moments coming from wind loading. Recently, it was found that grouted connections show limited performance in offshore wind turbine installations leading to settlements between the steel tubes and steel/grout debonding. Hence, structural health monitoring techniques for grouted connections are needed that ensure a safe and reliable operation of offshore wind turbines. This short communication describes the successful application of electromechanical impedance spectroscopy for damage detection in grouted connections.

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Fatigue behaviour of grouted connections at different ambient conditions and loading scenarios

Cited by 15 publications

References 4 publications

Non-linear finite element analysis of grouted connections for offshore monopile wind turbines

Non-linear finite element analysis of grouted connections for offshore monopile wind turbines

Axially loaded grouted connections in offshore conditions using ordinary portland cement

Damage detection in grouted connections using electromechanical impedance spectroscopy

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