Details
| Translated title of the contribution | Damage approach for hybrid connections in offshore wind turbines |
|---|---|
| Original language | German |
| Pages | 226-232 |
| Number of pages | 7 |
| Volume | 80 |
| Issue number | 4 |
| Journal | STAHLBAU |
| Publication status | Published - 1 Apr 2011 |
Abstract
During the service life of an offshore wind turbine, the connection between monopile and tower, the so-called grouted joint, is exposed to high dynamic loadings from wind and wave actions. Additionally the connection, which is filled with a high performance grout, has to withstand extreme load situations. Within the last years vertical settlements between the connected steel pipes have been detected. This non-redundant failure mode underlines the necessity for an optimization of the axial load bearing capacity. One possible solution is the application of shear keys, which are weld beads installed in circumferential direction of the connection on the surfaces of pile and sleeve. This additional mechanical interlock leads to compression struts and an increased axial strength. Unfortunately these geometric notches lead to local stress concentration and reduce the fatigue resistance of steel and grout. The fatigue design for the steel members can be performed ace. to well known local approaches. For plain grouted joints usually uniaxial S-N-curves for the grout layer are considered, which is not appropriate in cases of shear keys. Taking the multiaxial stress space around the weld beads and suitable S-N-curves into account, the fatigue design of the connection can be conducted.
ASJC Scopus subject areas
- Engineering(all)
- Civil and Structural Engineering
- Engineering(all)
- Building and Construction
- Engineering(all)
- Mechanics of Materials
- Engineering(all)
- Mechanical Engineering
- Materials Science(all)
- Metals and Alloys
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In: STAHLBAU, Vol. 80, No. 4, 01.04.2011, p. 226-232.
Research output: Contribution to specialist publication › Contribution in non-scientific journal › Transfer
}
TY - GEN
T1 - Schädigungsmodell für hybride Verbindungen in Offshore-Windenergieanlagen
AU - Schaumann, Peter
AU - Lochte-Holtgreven, Stephan
PY - 2011/4/1
Y1 - 2011/4/1
N2 - During the service life of an offshore wind turbine, the connection between monopile and tower, the so-called grouted joint, is exposed to high dynamic loadings from wind and wave actions. Additionally the connection, which is filled with a high performance grout, has to withstand extreme load situations. Within the last years vertical settlements between the connected steel pipes have been detected. This non-redundant failure mode underlines the necessity for an optimization of the axial load bearing capacity. One possible solution is the application of shear keys, which are weld beads installed in circumferential direction of the connection on the surfaces of pile and sleeve. This additional mechanical interlock leads to compression struts and an increased axial strength. Unfortunately these geometric notches lead to local stress concentration and reduce the fatigue resistance of steel and grout. The fatigue design for the steel members can be performed ace. to well known local approaches. For plain grouted joints usually uniaxial S-N-curves for the grout layer are considered, which is not appropriate in cases of shear keys. Taking the multiaxial stress space around the weld beads and suitable S-N-curves into account, the fatigue design of the connection can be conducted.
AB - During the service life of an offshore wind turbine, the connection between monopile and tower, the so-called grouted joint, is exposed to high dynamic loadings from wind and wave actions. Additionally the connection, which is filled with a high performance grout, has to withstand extreme load situations. Within the last years vertical settlements between the connected steel pipes have been detected. This non-redundant failure mode underlines the necessity for an optimization of the axial load bearing capacity. One possible solution is the application of shear keys, which are weld beads installed in circumferential direction of the connection on the surfaces of pile and sleeve. This additional mechanical interlock leads to compression struts and an increased axial strength. Unfortunately these geometric notches lead to local stress concentration and reduce the fatigue resistance of steel and grout. The fatigue design for the steel members can be performed ace. to well known local approaches. For plain grouted joints usually uniaxial S-N-curves for the grout layer are considered, which is not appropriate in cases of shear keys. Taking the multiaxial stress space around the weld beads and suitable S-N-curves into account, the fatigue design of the connection can be conducted.
UR - http://www.scopus.com/inward/record.url?scp=79955709421&partnerID=8YFLogxK
U2 - 10.1002/stab.201101414
DO - 10.1002/stab.201101414
M3 - Beitrag in Publikumszeitung/-zeitschrift
AN - SCOPUS:79955709421
VL - 80
SP - 226
EP - 232
JO - STAHLBAU
JF - STAHLBAU
SN - 0038-9145
ER -