Testing of jacket pile sleeve grouted connections exposed to variable axial loads

Johansen, Atle; Solland, Gunnar; Lervik, Andreas; Strande, Martin; Nybø, Terje

doi:10.1016/j.marstruc.2017.11.005

Cited by 15 publications

(3 citation statements)

References 2 publications

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“…The preferred design is shown to the right in Figure 6b where the grout is extended below the yoke plate. Laboratory tests have lately been performed to improve the design basis for these connections (Johansen et al, 2018 andMarion et al, 2018). This work will provide basis for the next revision of NORSOK N-004 with respect to capacity of grouted connections in jacket structures.…”

Section: Traditional Jacket Structuresmentioning

confidence: 99%

On Welded and Grouted Connections IN Offshore Tubular Steel Structures

Lotsberg¹

2019

Proceedings of the 17th International Symposium on Tubular Structures(ISTS17)

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This paper gives an overview of some of the most significant challenges and developments of welded and grouted connections in tubular structures subjected to dynamic loading in the North Sea the last 40 years. This includes design of tubular joints which may be designed with stubs to allow for welding from the inside and tubular joints welded from the outside only. In many structures the transition from one tubular thickness to another may be required. The development of stress concentration factor for these connections is presented. Conical connections are frequently used in framed tubular structures and some design guidance related to these together with relevant references are presented. The latest developments related to grouted connections in traditional jacket design, jackets with preinstalled piles and towers on monopiles are presented. Grouted connections are efficient to make connections of structural elements with large tolerances and for making connections below water.

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Section: Traditional Jacket Structuresmentioning

confidence: 99%

On Welded and Grouted Connections IN Offshore Tubular Steel Structures

Lotsberg¹

2019

Proceedings of the 17th International Symposium on Tubular Structures(ISTS17)

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“…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]. Many full-scale [26][27] or large-scale [28][29][30] experiments have been conducted to evaluate load resistance of pile-to-sleeve connections. Krahl and Karsan [31] were the first to analyze load transfer mechanism of shear key-grouted pile-to-sleeve connections, and proposed an analytical equation for axial load resistance based on the compression strut model.…”

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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“…Gholipour et al [16] evaluated the effects of axial load on dynamic responses and failure behaviors of reinforced concrete columns subjected to lateral impact loading by using numerical simulations in LS-DYNA. Johansen et al [17] studied the offshore jacket structures carrying variable axial loads, large shear forces and bending moments. Dong et al [18] presented an analytical study that predicts the low-velocity impact response of a spinning functionally graded graphene reinforced cylindrical shell subjected to impact, external axial and thermal loads.…”

Section: Introductionmentioning

confidence: 99%

Influence of Axial Loads to Propagation Characteristics of the Elastic Wave in a Non-Uniform Shaft

Wei

Zhao

Chen

et al. 2019

Chin. J. Mech. Eng.

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The vibration propagates through the shaft in the form of elastic waves. The propagation characteristics of the elastic waves are affected by the axial loads. The influence of the axial loads to the propagation characteristics of the elastic waves is studied in this paper. Firstly, the transfer matrix of the elastic waves for the non-uniform shaft with axial loads is deduced by combining the transfer matrix without axial load and the additional equation caused by the axial load. And then, a numerical method is used to study the influence of the axial load, non-uniformity and the rotating speed to the propagation characteristics of the elastic waves. It's found that a new Stop Band will appear due to the axial force, and the central frequency of which will decrease as the increase of the force, while the band width of which remains the same. The central frequency of the new Stop Band will also increase as the increase of the cross-section area ratio; however, the rotating speed of the shaft doesn't affect the propagation characteristics of the elastic waves obviously. Finally, an experimental rig is built up for further study, even though there are some small local errors, the results of experiments match well with the numerical ones, which indicates the validation of the theoretical results. The result can help to study the influence of the axial load to the dynamics of a non-uniform shaft and help to reveal the vibration propagating mechanism in such a shaft.

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Testing of jacket pile sleeve grouted connections exposed to variable axial loads

Cited by 15 publications

References 2 publications

On Welded and Grouted Connections IN Offshore Tubular Steel Structures

On Welded and Grouted Connections IN Offshore Tubular Steel Structures

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

Influence of Axial Loads to Propagation Characteristics of the Elastic Wave in a Non-Uniform Shaft

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