Details
| Original language | English |
|---|---|
| Title of host publication | Numerical methods in geotechnical engineering IX |
| Subtitle of host publication | Proceedings of the 9th European Conference on Numerical Methods in Geotechnical Engineering |
| Editors | António S. Cardoso, José L. Borges, Pedro A. Costa, António T. Gomes, José C. Marques, Castorina S. Vieira |
| Volume | 2 |
| ISBN (electronic) | 9780429446924 |
| Publication status | Published - 28 Jun 2018 |
| Event | 9th European Conference on Numerical Methods in Geotechnical Engineering, NUMGE 2018 - Porto, Portugal Duration: 25 Jun 2018 → 27 Jun 2018 |
Abstract
The foundation stiffness under operational loads is a crucial point in the design of monopile foundations. As key design issues, structural eigenfrequencies as well as the structural fatigue loading are significantly affected. According to measurement results, the current calculation methods lead to an underestimation of the actual existing foundation stiffness. The reason is most likely that the stiffness is usually figured out from load-displacement curves for virgin monotonic loading, whereas actually the stiffness under un- and reloading conditions is relevant for the operational behavior. Concerning this matter, the proposed paper presents numerical simulations to derive the foundation stiffness under un- and reloading condition. Herein, the HSsmall soil model is applied, that accounts for the strain dependency of soil stiffness. By varying the load level and the cyclic load amplitude, it is demonstrated that the secant foundation stiffness for un- and reloading is only slightly affected by the load level and the magnitude of the un- and reloading amplitude. Hence, the application of constant foundation stiffness in the overall dynamic structural analysis appears reasonable.
ASJC Scopus subject areas
- Mathematics(all)
- Numerical Analysis
- Earth and Planetary Sciences(all)
- Geotechnical Engineering and Engineering Geology
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Numerical methods in geotechnical engineering IX: Proceedings of the 9th European Conference on Numerical Methods in Geotechnical Engineering. ed. / António S. Cardoso; José L. Borges; Pedro A. Costa; António T. Gomes; José C. Marques; Castorina S. Vieira. Vol. 2 2018.
Research output: Chapter in book/report/conference proceeding › Conference contribution › Research › peer review
}
TY - GEN
T1 - Stiffness of monopile foundations under un- and reloading conditions
AU - Thieken, Klaus
AU - Achmus, Martin
AU - Saathoff, Jann Eike
AU - Albiker, Johannes
AU - Terceros, Mauricio
N1 - Publisher Copyright: © 2018 Taylor & Francis Group, London, UK. Copyright: Copyright 2019 Elsevier B.V., All rights reserved.
PY - 2018/6/28
Y1 - 2018/6/28
N2 - The foundation stiffness under operational loads is a crucial point in the design of monopile foundations. As key design issues, structural eigenfrequencies as well as the structural fatigue loading are significantly affected. According to measurement results, the current calculation methods lead to an underestimation of the actual existing foundation stiffness. The reason is most likely that the stiffness is usually figured out from load-displacement curves for virgin monotonic loading, whereas actually the stiffness under un- and reloading conditions is relevant for the operational behavior. Concerning this matter, the proposed paper presents numerical simulations to derive the foundation stiffness under un- and reloading condition. Herein, the HSsmall soil model is applied, that accounts for the strain dependency of soil stiffness. By varying the load level and the cyclic load amplitude, it is demonstrated that the secant foundation stiffness for un- and reloading is only slightly affected by the load level and the magnitude of the un- and reloading amplitude. Hence, the application of constant foundation stiffness in the overall dynamic structural analysis appears reasonable.
AB - The foundation stiffness under operational loads is a crucial point in the design of monopile foundations. As key design issues, structural eigenfrequencies as well as the structural fatigue loading are significantly affected. According to measurement results, the current calculation methods lead to an underestimation of the actual existing foundation stiffness. The reason is most likely that the stiffness is usually figured out from load-displacement curves for virgin monotonic loading, whereas actually the stiffness under un- and reloading conditions is relevant for the operational behavior. Concerning this matter, the proposed paper presents numerical simulations to derive the foundation stiffness under un- and reloading condition. Herein, the HSsmall soil model is applied, that accounts for the strain dependency of soil stiffness. By varying the load level and the cyclic load amplitude, it is demonstrated that the secant foundation stiffness for un- and reloading is only slightly affected by the load level and the magnitude of the un- and reloading amplitude. Hence, the application of constant foundation stiffness in the overall dynamic structural analysis appears reasonable.
UR - http://www.scopus.com/inward/record.url?scp=85061317873&partnerID=8YFLogxK
M3 - Conference contribution
SN - 9781138544468
VL - 2
BT - Numerical methods in geotechnical engineering IX
A2 - Cardoso, António S.
A2 - Borges, José L.
A2 - Costa, Pedro A.
A2 - Gomes, António T.
A2 - Marques, José C.
A2 - Vieira, Castorina S.
T2 - 9th European Conference on Numerical Methods in Geotechnical Engineering, NUMGE 2018
Y2 - 25 June 2018 through 27 June 2018
ER -