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

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@article{76361619cead481c85fac2a1e64860f8,
title = "Non-linear finite element analysis of grouted connections for offshore monopile wind turbines",
abstract = "Grouted Connections (GCs) are vital structural components of Offshore Wind Turbine (OWT) substructures. On monopiles to achieve a GC, tubular hollow steel piles are in-situ attached with a high-strength grout. Monopiles are susceptible to large magnitude bending loads in offshore environments. Recently, following inspections the performance of GCs has been called into doubt when settlements were reported on several monopiles. To further comprehend the structural performance of GCs under large bending moments a nonlinear Finite Element (FE) analysis was conducted. Three-dimensional FE models were solved and validated against experimental and analytical data with good agreement. It is suggested that the presented models can be used to evaluate the global and local behaviour of a GC accurately. Finally, a comprehensive parametric study was carried out to investigate the influence of shear key numbers, shear key spacing and overlap lengths. It was shown that increased number of shear keys are advantageous for stiffness and reduce the gap at the interfaces, whereas the grout failure depends on the spacing between neighbouring shear keys. The ability of the numerical model to trace all relevant failure modes which are provoked by shear key spacing was also demonstrated.",
keywords = "offshore wind turbines, finite element analysis, grouted connections, monopile, high-strength grout, shear keys",
author = "Nikolaos Tziavos and Hassan Hemida and Nicole Metje and Charalampos Baniotopoulos",
year = "2019",
month = "1",
day = "1",
doi = "10.1016/j.oceaneng.2018.11.005",
language = "English",
volume = "171",
pages = "633--645",
journal = "Ocean Engineering",
issn = "0029-8018",
publisher = "Elsevier",

}

RIS

TY - JOUR

T1 - Non-linear finite element analysis of grouted connections for offshore monopile wind turbines

AU - Tziavos, Nikolaos

AU - Hemida, Hassan

AU - Metje, Nicole

AU - Baniotopoulos, Charalampos

PY - 2019/1/1

Y1 - 2019/1/1

N2 - Grouted Connections (GCs) are vital structural components of Offshore Wind Turbine (OWT) substructures. On monopiles to achieve a GC, tubular hollow steel piles are in-situ attached with a high-strength grout. Monopiles are susceptible to large magnitude bending loads in offshore environments. Recently, following inspections the performance of GCs has been called into doubt when settlements were reported on several monopiles. To further comprehend the structural performance of GCs under large bending moments a nonlinear Finite Element (FE) analysis was conducted. Three-dimensional FE models were solved and validated against experimental and analytical data with good agreement. It is suggested that the presented models can be used to evaluate the global and local behaviour of a GC accurately. Finally, a comprehensive parametric study was carried out to investigate the influence of shear key numbers, shear key spacing and overlap lengths. It was shown that increased number of shear keys are advantageous for stiffness and reduce the gap at the interfaces, whereas the grout failure depends on the spacing between neighbouring shear keys. The ability of the numerical model to trace all relevant failure modes which are provoked by shear key spacing was also demonstrated.

AB - Grouted Connections (GCs) are vital structural components of Offshore Wind Turbine (OWT) substructures. On monopiles to achieve a GC, tubular hollow steel piles are in-situ attached with a high-strength grout. Monopiles are susceptible to large magnitude bending loads in offshore environments. Recently, following inspections the performance of GCs has been called into doubt when settlements were reported on several monopiles. To further comprehend the structural performance of GCs under large bending moments a nonlinear Finite Element (FE) analysis was conducted. Three-dimensional FE models were solved and validated against experimental and analytical data with good agreement. It is suggested that the presented models can be used to evaluate the global and local behaviour of a GC accurately. Finally, a comprehensive parametric study was carried out to investigate the influence of shear key numbers, shear key spacing and overlap lengths. It was shown that increased number of shear keys are advantageous for stiffness and reduce the gap at the interfaces, whereas the grout failure depends on the spacing between neighbouring shear keys. The ability of the numerical model to trace all relevant failure modes which are provoked by shear key spacing was also demonstrated.

KW - offshore wind turbines

KW - finite element analysis

KW - grouted connections

KW - monopile

KW - high-strength grout

KW - shear keys

UR - http://www.scopus.com/inward/record.url?scp=85059566142&partnerID=8YFLogxK

U2 - 10.1016/j.oceaneng.2018.11.005

DO - 10.1016/j.oceaneng.2018.11.005

M3 - Article

VL - 171

SP - 633

EP - 645

JO - Ocean Engineering

JF - Ocean Engineering

SN - 0029-8018

ER -