Grouted connections on monopiles: A numerical study

Nikolaos I. Tziavos; Hassan Hemida; Nicole Metje; C Baniotopoulos

doi:10.1007/978-981-13-2306-5_59

Grouted connections on monopiles: A numerical study

Nikolaos I. Tziavos^*, Hassan Hemida, Nicole Metje, C Baniotopoulos

^*Corresponding author for this work

Civil Engineering

Research output: Chapter in Book/Report/Conference proceeding › Chapter

1 Citation (Scopus)

Abstract

The installed capacity of offshore wind turbines (OWTs) has rapidly grown during the past decades around the globe. Monopiles are the most common substructure employed in the majority of the current operating OWTs. A monopile is usually formed by tubular steel tubes which are connected in-situ by means of an ultra-high strength grout. Monopiles differ from common jacket offshore structures as the main loading action is bending caused by environmental loads. Their structural performance principally relies on the grouted connection (GC). Particularly for this type of substructure, the connection is of critical interest due to several unexpected issues that were recently reported in wind farms around Europe. The latter were mainly related to sliding between the tubular steel piles of the substructure causing settlements.

In the present study an investigation of a grouted connection with shear keys by means of Finite Element Modelling (FEM) is presented. The FE model is validated against experimental data. An explicit quasi-static solution of the numerical model is conducted. A comprehensive description of the numerical model is provided, focusing on the representation of the cementitious grout and the failure modes. A sensitivity analysis and discussion on the associated parameters of the material model is given. Finally, an evaluation of the results from the numerical simulations is presented including the cracking behaviour of the grout.

Original language	English
Title of host publication	Proceedings of the 1st Vietnam Symposium on Advances in Offshore Engineering
Subtitle of host publication	Energy and Geotechnics
Editors	M.F. Randolph, Dinh Hong Doan, Anh Minh Tang, Man Bui, Van Nguyen Dinh
Publisher	Springer
Pages	421-427
Number of pages	7
Edition	1
ISBN (Electronic)	9789811323065
ISBN (Print)	9789811323058, 9789811347634
DOIs	https://doi.org/10.1007/978-981-13-2306-5_59
Publication status	Published - 25 Sept 2018
Event	The First Vietnam Symposium on Advances in Offshore Engineering (VSOE2018) - Hanoi, Viet Nam Duration: 1 Nov 2018 → 3 Nov 2018

Publication series

Name	Lecture Notes in Civil Engineering
Volume	18
ISSN (Print)	2366-2557
ISSN (Electronic)	2366-2565

Conference

Conference	The First Vietnam Symposium on Advances in Offshore Engineering (VSOE2018)
Country/Territory	Viet Nam
City	Hanoi
Period	1/11/18 → 3/11/18

Keywords

Finite element analysis
Grouted connections
Monopiles
Offshore wind turbines

ASJC Scopus subject areas

Civil and Structural Engineering

Access to Document

10.1007/978-981-13-2306-5_59

Cite this

Tziavos, N. I., Hemida, H., Metje, N., & Baniotopoulos, C. (2018). Grouted connections on monopiles: A numerical study. In M. F. Randolph, D. H. Doan, A. M. Tang, M. Bui, & V. N. Dinh (Eds.), Proceedings of the 1st Vietnam Symposium on Advances in Offshore Engineering: Energy and Geotechnics (1 ed., pp. 421-427). (Lecture Notes in Civil Engineering; Vol. 18). Springer. Advance online publication. https://doi.org/10.1007/978-981-13-2306-5_59

Tziavos, Nikolaos I. ; Hemida, Hassan ; Metje, Nicole et al. / Grouted connections on monopiles : A numerical study. Proceedings of the 1st Vietnam Symposium on Advances in Offshore Engineering: Energy and Geotechnics. editor / M.F. Randolph ; Dinh Hong Doan ; Anh Minh Tang ; Man Bui ; Van Nguyen Dinh. 1. ed. Springer, 2018. pp. 421-427 (Lecture Notes in Civil Engineering).

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title = "Grouted connections on monopiles: A numerical study",

abstract = "The installed capacity of offshore wind turbines (OWTs) has rapidly grown during the past decades around the globe. Monopiles are the most common substructure employed in the majority of the current operating OWTs. A monopile is usually formed by tubular steel tubes which are connected in-situ by means of an ultra-high strength grout. Monopiles differ from common jacket offshore structures as the main loading action is bending caused by environmental loads. Their structural performance principally relies on the grouted connection (GC). Particularly for this type of substructure, the connection is of critical interest due to several unexpected issues that were recently reported in wind farms around Europe. The latter were mainly related to sliding between the tubular steel piles of the substructure causing settlements. In the present study an investigation of a grouted connection with shear keys by means of Finite Element Modelling (FEM) is presented. The FE model is validated against experimental data. An explicit quasi-static solution of the numerical model is conducted. A comprehensive description of the numerical model is provided, focusing on the representation of the cementitious grout and the failure modes. A sensitivity analysis and discussion on the associated parameters of the material model is given. Finally, an evaluation of the results from the numerical simulations is presented including the cracking behaviour of the grout.",

keywords = "Finite element analysis, Grouted connections, Monopiles, Offshore wind turbines",

author = "Tziavos, {Nikolaos I.} and Hassan Hemida and Nicole Metje and C Baniotopoulos",

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doi = "10.1007/978-981-13-2306-5_59",

language = "English",

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booktitle = "Proceedings of the 1st Vietnam Symposium on Advances in Offshore Engineering",

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Tziavos, NI, Hemida, H , Metje, N & Baniotopoulos, C 2018, Grouted connections on monopiles: A numerical study. in MF Randolph, DH Doan, AM Tang, M Bui & VN Dinh (eds), Proceedings of the 1st Vietnam Symposium on Advances in Offshore Engineering: Energy and Geotechnics. 1 edn, Lecture Notes in Civil Engineering, vol. 18, Springer, pp. 421-427, The First Vietnam Symposium on Advances in Offshore Engineering (VSOE2018), Hanoi, Viet Nam, 1/11/18. https://doi.org/10.1007/978-981-13-2306-5_59

Grouted connections on monopiles: A numerical study. / Tziavos, Nikolaos I.; Hemida, Hassan ; Metje, Nicole et al.
Proceedings of the 1st Vietnam Symposium on Advances in Offshore Engineering: Energy and Geotechnics. ed. / M.F. Randolph; Dinh Hong Doan; Anh Minh Tang; Man Bui; Van Nguyen Dinh. 1. ed. Springer, 2018. p. 421-427 (Lecture Notes in Civil Engineering; Vol. 18).

Research output: Chapter in Book/Report/Conference proceeding › Chapter

TY - CHAP

T1 - Grouted connections on monopiles

T2 - The First Vietnam Symposium on Advances in Offshore Engineering (VSOE2018)

AU - Tziavos, Nikolaos I.

AU - Hemida, Hassan

AU - Metje, Nicole

AU - Baniotopoulos, C

PY - 2018/9/25

Y1 - 2018/9/25

N2 - The installed capacity of offshore wind turbines (OWTs) has rapidly grown during the past decades around the globe. Monopiles are the most common substructure employed in the majority of the current operating OWTs. A monopile is usually formed by tubular steel tubes which are connected in-situ by means of an ultra-high strength grout. Monopiles differ from common jacket offshore structures as the main loading action is bending caused by environmental loads. Their structural performance principally relies on the grouted connection (GC). Particularly for this type of substructure, the connection is of critical interest due to several unexpected issues that were recently reported in wind farms around Europe. The latter were mainly related to sliding between the tubular steel piles of the substructure causing settlements. In the present study an investigation of a grouted connection with shear keys by means of Finite Element Modelling (FEM) is presented. The FE model is validated against experimental data. An explicit quasi-static solution of the numerical model is conducted. A comprehensive description of the numerical model is provided, focusing on the representation of the cementitious grout and the failure modes. A sensitivity analysis and discussion on the associated parameters of the material model is given. Finally, an evaluation of the results from the numerical simulations is presented including the cracking behaviour of the grout.

AB - The installed capacity of offshore wind turbines (OWTs) has rapidly grown during the past decades around the globe. Monopiles are the most common substructure employed in the majority of the current operating OWTs. A monopile is usually formed by tubular steel tubes which are connected in-situ by means of an ultra-high strength grout. Monopiles differ from common jacket offshore structures as the main loading action is bending caused by environmental loads. Their structural performance principally relies on the grouted connection (GC). Particularly for this type of substructure, the connection is of critical interest due to several unexpected issues that were recently reported in wind farms around Europe. The latter were mainly related to sliding between the tubular steel piles of the substructure causing settlements. In the present study an investigation of a grouted connection with shear keys by means of Finite Element Modelling (FEM) is presented. The FE model is validated against experimental data. An explicit quasi-static solution of the numerical model is conducted. A comprehensive description of the numerical model is provided, focusing on the representation of the cementitious grout and the failure modes. A sensitivity analysis and discussion on the associated parameters of the material model is given. Finally, an evaluation of the results from the numerical simulations is presented including the cracking behaviour of the grout.

KW - Finite element analysis

KW - Grouted connections

KW - Monopiles

KW - Offshore wind turbines

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DO - 10.1007/978-981-13-2306-5_59

M3 - Chapter

AN - SCOPUS:85060339138

SN - 9789811323058

SN - 9789811347634

T3 - Lecture Notes in Civil Engineering

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BT - Proceedings of the 1st Vietnam Symposium on Advances in Offshore Engineering

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PB - Springer

Y2 - 1 November 2018 through 3 November 2018

ER -

Tziavos NI, Hemida H , Metje N , Baniotopoulos C. Grouted connections on monopiles: A numerical study. In Randolph MF, Doan DH, Tang AM, Bui M, Dinh VN, editors, Proceedings of the 1st Vietnam Symposium on Advances in Offshore Engineering: Energy and Geotechnics. 1 ed. Springer. 2018. p. 421-427. (Lecture Notes in Civil Engineering). Epub 2018 Sept 24. doi: 10.1007/978-981-13-2306-5_59

Grouted connections on monopiles: A numerical study

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