Details
| Original language | English |
|---|---|
| Pages (from-to) | 173-184 |
| Number of pages | 12 |
| Journal | Geotechnical Testing Journal |
| Volume | 40 |
| Issue number | 2 |
| Early online date | 28 Feb 2017 |
| Publication status | Published - Mar 2017 |
Abstract
Large-diameter monopiles are an established foundation type for offshore wind energy converters. A crucial aspect in the design of such piles is the bearing behavior under cyclically acting wind and wave loads, namely the accumulation of deflections and rotations under these loads. Regarding the prediction of the behavior under cyclic one-way load, some empirical approaches and also numerical simulation methods exist. In contrast, the behavior under cyclic two-way loading is widely unclear and must be investigated by pile tests. This paper presents the results of 1 g model tests with large-diameter piles in sand under arbitrary cyclic loading types. It was found that for almost rigid large-diameter piles, the effect of the loading type on the rate of displacement accumulation could be accounted for by a function which is almost independent on the system parameters, e.g., pile stiffness or relative density of the sand, but dependent on load eccentricity. The maximum accumulation rate occurs for asymmetric two-way loading. Using the functions found in the tests, a prediction of displacement accumulation for load spectra consisting of packages of arbitrary loads becomes possible. For flexible piles, a different effect of the loading type on the rate of displacement accumulation was observed. Here, asymmetric two-way loading was obviously not more unfavorable than one-way load.
Keywords
- Cyclic loading, Displacement accumulation, Monopiles
ASJC Scopus subject areas
- Earth and Planetary Sciences(all)
- Geotechnical Engineering and Engineering Geology
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In: Geotechnical Testing Journal, Vol. 40, No. 2, 03.2017, p. 173-184.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - 1 g Model Tests on the Displacement Accumulation of Large-Diameter Piles Under Cyclic Lateral Loading
AU - Albiker, J.
AU - Achmus, M.
AU - Frick, D.
AU - Flindt, F.
N1 - Publisher Copyright: Copyright © 2017 by ASTM International. Copyright: Copyright 2018 Elsevier B.V., All rights reserved.
PY - 2017/3
Y1 - 2017/3
N2 - Large-diameter monopiles are an established foundation type for offshore wind energy converters. A crucial aspect in the design of such piles is the bearing behavior under cyclically acting wind and wave loads, namely the accumulation of deflections and rotations under these loads. Regarding the prediction of the behavior under cyclic one-way load, some empirical approaches and also numerical simulation methods exist. In contrast, the behavior under cyclic two-way loading is widely unclear and must be investigated by pile tests. This paper presents the results of 1 g model tests with large-diameter piles in sand under arbitrary cyclic loading types. It was found that for almost rigid large-diameter piles, the effect of the loading type on the rate of displacement accumulation could be accounted for by a function which is almost independent on the system parameters, e.g., pile stiffness or relative density of the sand, but dependent on load eccentricity. The maximum accumulation rate occurs for asymmetric two-way loading. Using the functions found in the tests, a prediction of displacement accumulation for load spectra consisting of packages of arbitrary loads becomes possible. For flexible piles, a different effect of the loading type on the rate of displacement accumulation was observed. Here, asymmetric two-way loading was obviously not more unfavorable than one-way load.
AB - Large-diameter monopiles are an established foundation type for offshore wind energy converters. A crucial aspect in the design of such piles is the bearing behavior under cyclically acting wind and wave loads, namely the accumulation of deflections and rotations under these loads. Regarding the prediction of the behavior under cyclic one-way load, some empirical approaches and also numerical simulation methods exist. In contrast, the behavior under cyclic two-way loading is widely unclear and must be investigated by pile tests. This paper presents the results of 1 g model tests with large-diameter piles in sand under arbitrary cyclic loading types. It was found that for almost rigid large-diameter piles, the effect of the loading type on the rate of displacement accumulation could be accounted for by a function which is almost independent on the system parameters, e.g., pile stiffness or relative density of the sand, but dependent on load eccentricity. The maximum accumulation rate occurs for asymmetric two-way loading. Using the functions found in the tests, a prediction of displacement accumulation for load spectra consisting of packages of arbitrary loads becomes possible. For flexible piles, a different effect of the loading type on the rate of displacement accumulation was observed. Here, asymmetric two-way loading was obviously not more unfavorable than one-way load.
KW - Cyclic loading
KW - Displacement accumulation
KW - Monopiles
UR - http://www.scopus.com/inward/record.url?scp=85051497894&partnerID=8YFLogxK
U2 - 10.1520/GTJ20160102
DO - 10.1520/GTJ20160102
M3 - Article
AN - SCOPUS:85051497894
VL - 40
SP - 173
EP - 184
JO - Geotechnical Testing Journal
JF - Geotechnical Testing Journal
SN - 0149-6115
IS - 2
ER -