Details
| Original language | English |
|---|---|
| Title of host publication | European Wind Energy Conference and Exhibition, EWEC 2013 |
| Pages | 1990-1999 |
| Number of pages | 10 |
| Publication status | Published - 2013 |
| Event | European Wind Energy Conference and Exhibition, EWEC 2013 - Vienna, Austria Duration: 4 Feb 2013 → 7 Feb 2013 |
Publication series
| Name | European Wind Energy Conference and Exhibition, EWEC 2013 |
|---|---|
| Volume | 3 |
Abstract
Grouted joints used in lattice support structures such as tripods or jackets for offshore wind turbines demand for reliable and economic design regulations. Current standards are not valid for executed geometries and used grout material due to the experimental background for which the design approaches were developed. Moreover, fatigue capacities of grouted joints are estimated without an acknowledged design model. To improve the design regulations for predominantly axial loaded grouted connections, a research project is conducted at the Institutes for Steel Construction and Building Materials Science, Leibniz University Hannover. Within this project small and large scale grouted joint specimens are tested under fatigue loading conditions. Additionally, influencing factors of varying contact specification at the interface between steel and grout are investigated. This paper introduces the test setups and describes results of surface roughness measurements of the specimens. The measurements are within the expected ranges of surface roughness for steel. In addition, results from small scale tests conducted submerged in water are presented. It becomes apparent, that water at the interface between steel and grout significantly reduces the fatigue performance of grouted joints. As one reason, hydro lubrication reducing the friction coefficient between steel and grout and leading to higher stress concentrations can be stated. Furthermore, a dependency on the test load frequency was observed, so that higher frequencies have a negative impact on the fatigue performance.
Keywords
- Contact interface, Fatigue, Friction, Grouted joints, Hydro lubrication, Surface irregularities, Surface roughness
ASJC Scopus subject areas
Sustainable Development Goals
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European Wind Energy Conference and Exhibition, EWEC 2013. 2013. p. 1990-1999 (European Wind Energy Conference and Exhibition, EWEC 2013; Vol. 3).
Research output: Chapter in book/report/conference proceeding › Conference contribution › Research › peer review
}
TY - GEN
T1 - Impact of contact interface conditions on the axial load bearing capacity of grouted connections
AU - Schaumann, Peter
AU - Raba, Alexander
AU - Bechtel, Anne
PY - 2013
Y1 - 2013
N2 - Grouted joints used in lattice support structures such as tripods or jackets for offshore wind turbines demand for reliable and economic design regulations. Current standards are not valid for executed geometries and used grout material due to the experimental background for which the design approaches were developed. Moreover, fatigue capacities of grouted joints are estimated without an acknowledged design model. To improve the design regulations for predominantly axial loaded grouted connections, a research project is conducted at the Institutes for Steel Construction and Building Materials Science, Leibniz University Hannover. Within this project small and large scale grouted joint specimens are tested under fatigue loading conditions. Additionally, influencing factors of varying contact specification at the interface between steel and grout are investigated. This paper introduces the test setups and describes results of surface roughness measurements of the specimens. The measurements are within the expected ranges of surface roughness for steel. In addition, results from small scale tests conducted submerged in water are presented. It becomes apparent, that water at the interface between steel and grout significantly reduces the fatigue performance of grouted joints. As one reason, hydro lubrication reducing the friction coefficient between steel and grout and leading to higher stress concentrations can be stated. Furthermore, a dependency on the test load frequency was observed, so that higher frequencies have a negative impact on the fatigue performance.
AB - Grouted joints used in lattice support structures such as tripods or jackets for offshore wind turbines demand for reliable and economic design regulations. Current standards are not valid for executed geometries and used grout material due to the experimental background for which the design approaches were developed. Moreover, fatigue capacities of grouted joints are estimated without an acknowledged design model. To improve the design regulations for predominantly axial loaded grouted connections, a research project is conducted at the Institutes for Steel Construction and Building Materials Science, Leibniz University Hannover. Within this project small and large scale grouted joint specimens are tested under fatigue loading conditions. Additionally, influencing factors of varying contact specification at the interface between steel and grout are investigated. This paper introduces the test setups and describes results of surface roughness measurements of the specimens. The measurements are within the expected ranges of surface roughness for steel. In addition, results from small scale tests conducted submerged in water are presented. It becomes apparent, that water at the interface between steel and grout significantly reduces the fatigue performance of grouted joints. As one reason, hydro lubrication reducing the friction coefficient between steel and grout and leading to higher stress concentrations can be stated. Furthermore, a dependency on the test load frequency was observed, so that higher frequencies have a negative impact on the fatigue performance.
KW - Contact interface
KW - Fatigue
KW - Friction
KW - Grouted joints
KW - Hydro lubrication
KW - Surface irregularities
KW - Surface roughness
UR - http://www.scopus.com/inward/record.url?scp=84903443301&partnerID=8YFLogxK
M3 - Conference contribution
AN - SCOPUS:84903443301
SN - 9781632663146
T3 - European Wind Energy Conference and Exhibition, EWEC 2013
SP - 1990
EP - 1999
BT - European Wind Energy Conference and Exhibition, EWEC 2013
T2 - European Wind Energy Conference and Exhibition, EWEC 2013
Y2 - 4 February 2013 through 7 February 2013
ER -