Experimental Investigations of Tension Piles in Sand Subjected to Static and Cyclic Loading

Kristina Thomassen

Publikation: Bog/antologi/afhandling/rapportPh.d.-afhandlingForskning

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Resumé

The present thesis regards the behavior of the piles in jacket pile foundations used for offshore wind turbines. The piles are often loaded in tension because of the combination of wind and wave conditions and the low self-weight of the wind turbine. The repeated cyclic loading can lead to accumulated upwards displacement of the piles and, thus, undesired deflection of the wind turbine structure.

This study concerns the effect of cyclic loading on a pile installed in dense sand and loaded in tension. A new laboratory test setup was constructed to make these pile load tests. The thesis discusses the advantages and disadvantages of the test setup. The results of cyclic loading tests showed that the loading conditions are very important for the behavior of piles. Some wind and wave conditions can be beneficial and increase the pile capacity while other conditions can be damaging and reduce the pile capacity and result in large permanent displacement of the piles. Hence, it is vital to account for the cyclic load conditions at the site of an offshore wind farm when designing the wind turbines.
OriginalsprogEngelsk
ForlagAalborg Universitetsforlag
Antal sider245
ISBN (Trykt)978-87-7112-467-5
DOI
StatusUdgivet - 2016
NavnPh.d.-serien for Det Teknisk-Naturvidenskabelige Fakultet, Aalborg Universitet
ISSN2246-1248

Fingerprint

cyclic loading
pile
sand
wind turbine
wind farm
loading test
deflection

Bibliografisk note

Lars Bo Ibsen, Principal supervisor
Lars Vabbersgaard Andersen, Secondary supervisor

Emneord

  • pælebelastningsforsøg
  • pæle i sand
  • aksial belastning
  • trækpæle
  • statisk belastning
  • cyklisk belastning
  • tætlejret sand
  • laboratorieforsøg
  • fundament til havvindmøller

Citer dette

Thomassen, K. (2016). Experimental Investigations of Tension Piles in Sand Subjected to Static and Cyclic Loading. Aalborg Universitetsforlag. Ph.d.-serien for Det Teknisk-Naturvidenskabelige Fakultet, Aalborg Universitet https://doi.org/10.5278/vbn.phd.engsci.00056
Thomassen, Kristina. / Experimental Investigations of Tension Piles in Sand Subjected to Static and Cyclic Loading. Aalborg Universitetsforlag, 2016. 245 s. (Ph.d.-serien for Det Teknisk-Naturvidenskabelige Fakultet, Aalborg Universitet).
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abstract = "The present thesis regards the behavior of the piles in jacket pile foundations used for offshore wind turbines. The piles are often loaded in tension because of the combination of wind and wave conditions and the low self-weight of the wind turbine. The repeated cyclic loading can lead to accumulated upwards displacement of the piles and, thus, undesired deflection of the wind turbine structure. This study concerns the effect of cyclic loading on a pile installed in dense sand and loaded in tension. A new laboratory test setup was constructed to make these pile load tests. The thesis discusses the advantages and disadvantages of the test setup. The results of cyclic loading tests showed that the loading conditions are very important for the behavior of piles. Some wind and wave conditions can be beneficial and increase the pile capacity while other conditions can be damaging and reduce the pile capacity and result in large permanent displacement of the piles. Hence, it is vital to account for the cyclic load conditions at the site of an offshore wind farm when designing the wind turbines.",
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author = "Kristina Thomassen",
note = "Lars Bo Ibsen, Principal supervisor Lars Vabbersgaard Andersen, Secondary supervisor",
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Thomassen, K 2016, Experimental Investigations of Tension Piles in Sand Subjected to Static and Cyclic Loading. Ph.d.-serien for Det Teknisk-Naturvidenskabelige Fakultet, Aalborg Universitet, Aalborg Universitetsforlag. https://doi.org/10.5278/vbn.phd.engsci.00056

Experimental Investigations of Tension Piles in Sand Subjected to Static and Cyclic Loading. / Thomassen, Kristina.

Aalborg Universitetsforlag, 2016. 245 s. (Ph.d.-serien for Det Teknisk-Naturvidenskabelige Fakultet, Aalborg Universitet).

Publikation: Bog/antologi/afhandling/rapportPh.d.-afhandlingForskning

TY - BOOK

T1 - Experimental Investigations of Tension Piles in Sand Subjected to Static and Cyclic Loading

AU - Thomassen, Kristina

N1 - Lars Bo Ibsen, Principal supervisor Lars Vabbersgaard Andersen, Secondary supervisor

PY - 2016

Y1 - 2016

N2 - The present thesis regards the behavior of the piles in jacket pile foundations used for offshore wind turbines. The piles are often loaded in tension because of the combination of wind and wave conditions and the low self-weight of the wind turbine. The repeated cyclic loading can lead to accumulated upwards displacement of the piles and, thus, undesired deflection of the wind turbine structure. This study concerns the effect of cyclic loading on a pile installed in dense sand and loaded in tension. A new laboratory test setup was constructed to make these pile load tests. The thesis discusses the advantages and disadvantages of the test setup. The results of cyclic loading tests showed that the loading conditions are very important for the behavior of piles. Some wind and wave conditions can be beneficial and increase the pile capacity while other conditions can be damaging and reduce the pile capacity and result in large permanent displacement of the piles. Hence, it is vital to account for the cyclic load conditions at the site of an offshore wind farm when designing the wind turbines.

AB - The present thesis regards the behavior of the piles in jacket pile foundations used for offshore wind turbines. The piles are often loaded in tension because of the combination of wind and wave conditions and the low self-weight of the wind turbine. The repeated cyclic loading can lead to accumulated upwards displacement of the piles and, thus, undesired deflection of the wind turbine structure. This study concerns the effect of cyclic loading on a pile installed in dense sand and loaded in tension. A new laboratory test setup was constructed to make these pile load tests. The thesis discusses the advantages and disadvantages of the test setup. The results of cyclic loading tests showed that the loading conditions are very important for the behavior of piles. Some wind and wave conditions can be beneficial and increase the pile capacity while other conditions can be damaging and reduce the pile capacity and result in large permanent displacement of the piles. Hence, it is vital to account for the cyclic load conditions at the site of an offshore wind farm when designing the wind turbines.

KW - pælebelastningsforsøg

KW - pæle i sand

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KW - trækpæle

KW - statisk belastning

KW - cyklisk belastning

KW - tætlejret sand

KW - laboratorieforsøg

KW - fundament til havvindmøller

KW - pile load tests

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KW - piles in tension

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BT - Experimental Investigations of Tension Piles in Sand Subjected to Static and Cyclic Loading

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Thomassen K. Experimental Investigations of Tension Piles in Sand Subjected to Static and Cyclic Loading. Aalborg Universitetsforlag, 2016. 245 s. (Ph.d.-serien for Det Teknisk-Naturvidenskabelige Fakultet, Aalborg Universitet). https://doi.org/10.5278/vbn.phd.engsci.00056