On the Structural Capacity of Grouted Connections in Offshore Structures

Lotsberg, Inge; Serednicki, Andrzej; Cramer, Espen H.; Bertnes, Ha ̊kon; Haahr, Per Enggaard

doi:10.1115/omae2011-49169

Cited by 5 publications

(2 citation statements)

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“…In contrast, the SHS column connection can be applied in modular construction industry as it is easy for installation, arrangement and standardization. Extensive studies have been conducted to investigate failure modes and load resistances of CHS pile-to-sleeve connections [20][21][22]. Axial load resistance of a grouted connection is attributed to the bond strength due to friction and adhesion between grout and steel tube, and the mechanical interlock provided by shear keys [23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Axial-Load Resistance of a Novel UHPFRC Grouted SHS Tube-Sleeve Connection: Experimental, Numerical, and Theoretical Approaches

et al. 2021

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This study conducts experimental, numerical and theoretical analyses on the axial load resistance of a novel ultra-high performance fiber reinforced concrete (UHPFRC) grouted square hollow section (SHS) tube sleeve connection. The experimental study tests ten full-scale specimens with varying shear key spacings, grout thicknesses, grout lengths and volume proportions of steel fiber in the UHPFRC. Two types of failure modes are observed: (1) for the connection with high strength of the grouted part, the failure mode is fracture of the inner tube; (2) for the connection with lower strength of the grouted part, the failure mode is grout shear crushing with significant bond-slip between grout and steel tube. To further understand the load transfer mechanism of the connection, an advanced 3D nonlinear FE model is built to simulate the axial load-displacement behavior, state of stress and strain, as well as crack development of the grout. Based on the test and FE results, a new theoretical model is derived to predict the axial load resistance of the connection. The proposed model has considered the effect of section shape and material parameters, and is applicable to UHPFRC grouted SHS tube sleeve connection with different corner radii. The validations against the test results show that the new model can provide reasonably effective and accurate predictions to the axial load resistance of the novel grouted sleeve connection subjected to tension.

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Section: Introductionmentioning

confidence: 99%

Axial-Load Resistance of a Novel UHPFRC Grouted SHS Tube-Sleeve Connection: Experimental, Numerical, and Theoretical Approaches

et al. 2021

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“…In order to get more accurate calculation methods, further studies have been conducted. In combination with practical engineering, Lotsberg et al [11] revealed that the axial bearing performance of a grouted connection was much more affected by the diameter and surface manufacturing error of the connection segment than that described in the specification. Dallyn et al [12] obtained the correlation of these parameters through a great deal of parameter analysis and provided suggestions for ensuring the design reliability of bearing performance.…”

Section: Introductionmentioning

confidence: 99%

Comparison of Prediction Methods for Axial Strength of Grouted Connections with Shear Keys

2020

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Grouted connections are commonly used in marine engineering, especially on oil platforms, cross-sea bridges, and offshore wind power turbines. The prediction methods for axial carrying capacity of grouted connections with shear keys and their application ranges in current codes were analyzed in this paper. The calculated results by using different codes were compared based on a practical grouted connection between steel piles and the jacket foundation of a wind turbine. The research team conducted axial compression tests on seven specimens, collected a wide range of experimental results to establish a database, and finally compared the standard calculation results with the experimental results. The study indicates that the axial strength of grouted connections predicted by different methods is distinct. The calculation formula of the British Health and Safety Executive (HSE, 2002) has obvious limitations; specifically, with increased shear keys, strength is overestimated, resulting in insecure design outcome of structures. The results calculated by the Norwegian Det Norske Veritas (DNV, 2013) are generally consistent with the experimental results, in which the reduction effect of multiple shear keys was considered. The prediction method of the American Petroleum Institute (API, 2007), which undervalues the bearing performance of connections, is excessively conservative. The method of the combined Norwegian and German Det Norske Veritas–Germanischer Lloyd (DNV-GL, 2016) has wider applicability and is safe, reliable, and economical.

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Offshore wind turbines and wind farms

2021

Wind Energy Handbook 3e

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On the Structural Capacity of Grouted Connections in Offshore Structures

Cited by 5 publications

References 0 publications

Axial-Load Resistance of a Novel UHPFRC Grouted SHS Tube-Sleeve Connection: Experimental, Numerical, and Theoretical Approaches

Axial-Load Resistance of a Novel UHPFRC Grouted SHS Tube-Sleeve Connection: Experimental, Numerical, and Theoretical Approaches

Comparison of Prediction Methods for Axial Strength of Grouted Connections with Shear Keys

Offshore wind turbines and wind farms

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