The effect of stress-level on the response of a model monopile to cyclic lateral loading in sand
Monopile foundations supporting offshore wind turbines are exposed to cyclic lateral loading which can cause accumulated pile displacement or rotation and evolution of the dynamic response. To inform the development of improved design methods, the monopile’s response to cyclic lateral loading has be...
| Main Authors: | , , , , |
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| Format: | Journal article |
| Language: | English |
| Published: |
American Society of Civil Engineers
2021
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| _version_ | 1826260448587022336 |
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| author | Richards, I Bransby, F Byrne, B Gaudin, C Houlsby, G |
| author_facet | Richards, I Bransby, F Byrne, B Gaudin, C Houlsby, G |
| author_sort | Richards, I |
| collection | OXFORD |
| description | Monopile foundations supporting offshore wind turbines are exposed to cyclic lateral loading which can cause accumulated pile displacement or rotation and evolution of the dynamic response. To inform the development of improved design methods, the monopile’s response to cyclic lateral loading has been explored through small-scale physical modelling at 1g and in the centrifuge, and at large-scale in the field. There are advantages and disadvantages to each physical modelling technique, and the response may be most efficiently explored through a combination of modelling techniques. However, stress-level varies significantly between these techniques, and only centrifuge testing can simulate full-scale stress-levels. This paper explores the effect of stress-level on the response of a monopile foundation in dry sand to monotonic, unidirectional cyclic and multidirectional cyclic lateral loading with small-scale tests at 1g and in the centrifuge at 9g and 80g. With an identical set-up at each g-level, stress-level effects were isolated. Qualitatively, the responses are similar across the stress-levels, but some important quantitative differences are revealed. In particular, the rate of accumulation of pile displacement and the rate of change of secant stiffness under cyclic loading are found to reduce with increasing stress-level. The results highlight the need to simulate full-scale stress-levels to thoroughly understand foundation behaviour, but also demonstrate the qualitative insight that can be gained through 1g physical modelling. The data and trends presented in this paper provide input for the modelling of monopile responses at different stress-levels. |
| first_indexed | 2024-03-06T19:05:49Z |
| format | Journal article |
| id | oxford-uuid:15186152-a842-4c43-bf38-eed485a31add |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-06T19:05:49Z |
| publishDate | 2021 |
| publisher | American Society of Civil Engineers |
| record_format | dspace |
| spelling | oxford-uuid:15186152-a842-4c43-bf38-eed485a31add2022-03-26T10:23:32ZThe effect of stress-level on the response of a model monopile to cyclic lateral loading in sandJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:15186152-a842-4c43-bf38-eed485a31addEnglishSymplectic ElementsAmerican Society of Civil Engineers2021Richards, IBransby, FByrne, BGaudin, CHoulsby, GMonopile foundations supporting offshore wind turbines are exposed to cyclic lateral loading which can cause accumulated pile displacement or rotation and evolution of the dynamic response. To inform the development of improved design methods, the monopile’s response to cyclic lateral loading has been explored through small-scale physical modelling at 1g and in the centrifuge, and at large-scale in the field. There are advantages and disadvantages to each physical modelling technique, and the response may be most efficiently explored through a combination of modelling techniques. However, stress-level varies significantly between these techniques, and only centrifuge testing can simulate full-scale stress-levels. This paper explores the effect of stress-level on the response of a monopile foundation in dry sand to monotonic, unidirectional cyclic and multidirectional cyclic lateral loading with small-scale tests at 1g and in the centrifuge at 9g and 80g. With an identical set-up at each g-level, stress-level effects were isolated. Qualitatively, the responses are similar across the stress-levels, but some important quantitative differences are revealed. In particular, the rate of accumulation of pile displacement and the rate of change of secant stiffness under cyclic loading are found to reduce with increasing stress-level. The results highlight the need to simulate full-scale stress-levels to thoroughly understand foundation behaviour, but also demonstrate the qualitative insight that can be gained through 1g physical modelling. The data and trends presented in this paper provide input for the modelling of monopile responses at different stress-levels. |
| spellingShingle | Richards, I Bransby, F Byrne, B Gaudin, C Houlsby, G The effect of stress-level on the response of a model monopile to cyclic lateral loading in sand |
| title | The effect of stress-level on the response of a model monopile to cyclic lateral loading in sand |
| title_full | The effect of stress-level on the response of a model monopile to cyclic lateral loading in sand |
| title_fullStr | The effect of stress-level on the response of a model monopile to cyclic lateral loading in sand |
| title_full_unstemmed | The effect of stress-level on the response of a model monopile to cyclic lateral loading in sand |
| title_short | The effect of stress-level on the response of a model monopile to cyclic lateral loading in sand |
| title_sort | effect of stress level on the response of a model monopile to cyclic lateral loading in sand |
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