Details
| Original language | English |
|---|---|
| Title of host publication | Current Perspectives and New Directions in Mechanics, Modelling and Design of Structural Systems - Proceedings of the 8th International Conference on Structural Engineering, Mechanics and Computation, 2022 |
| Editors | Alphose Zingoni |
| Pages | 2021-2027 |
| Number of pages | 7 |
| ISBN (electronic) | 9781003348443 |
| Publication status | Published - 2022 |
| Event | 8th International Conference on Structural Engineering, Mechanics and Computation, SEMC 2022 - Cape Town, South Africa Duration: 5 Sept 2022 → 7 Sept 2022 |
Publication series
| Name | Current Perspectives and New Directions in Mechanics, Modelling and Design of Structural Systems - Proceedings of the 8th International Conference on Structural Engineering, Mechanics and Computation, 2022 |
|---|
Abstract
The axial soil resistance is a crucial component within the design process of buried district heating pipelines and is known to degrade during the service life time due to axial movement of the pipeline under cyclic temperature loading. In current design methods, a large bandwidth of the coefficient of friction μ between pipe and soil is considered to account for this effect. However, a more accurate consideration of cyclic effects on the axial resistance could lead to a more economic design of district heating pipelines. Experimental investigations were carried out to identify the main factors influencing the friction degradation. It was found that beside stress and relative density of the surrounding soil, the amount of resistance degradation and also its rate are strongly affected by the magnitude of cyclic pipe movement and the number of load cycles. It could also be observed that the degradation can partly be healed dependent of the order of load packages, i.e. subsequent cycles with constant displacement amplitude. These findings necessitate a new consideration of soil resistance within the service life prediction. A calculation concept is introduced, which describes the axial friction resistance as a function of overburden height, pipeline diameter and soil’s relative density, but in addition also dependent on the actual relative movement between pipeline and soil as well as on the history of cyclic displacements. Thereby it becomes possible to calculate more realistic friction resistances for arbitrary points of time, distinct for every location within the network.
ASJC Scopus subject areas
- Engineering(all)
- Civil and Structural Engineering
- Engineering(all)
- Computational Mechanics
Sustainable Development Goals
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Current Perspectives and New Directions in Mechanics, Modelling and Design of Structural Systems - Proceedings of the 8th International Conference on Structural Engineering, Mechanics and Computation, 2022. ed. / Alphose Zingoni. 2022. p. 2021-2027 (Current Perspectives and New Directions in Mechanics, Modelling and Design of Structural Systems - Proceedings of the 8th International Conference on Structural Engineering, Mechanics and Computation, 2022).
Research output: Chapter in book/report/conference proceeding › Conference contribution › Research › peer review
}
TY - GEN
T1 - Degradation of axial friction resistance on buried district heating pipes
AU - Gerlach, T.
AU - Achmus, M.
PY - 2022
Y1 - 2022
N2 - The axial soil resistance is a crucial component within the design process of buried district heating pipelines and is known to degrade during the service life time due to axial movement of the pipeline under cyclic temperature loading. In current design methods, a large bandwidth of the coefficient of friction μ between pipe and soil is considered to account for this effect. However, a more accurate consideration of cyclic effects on the axial resistance could lead to a more economic design of district heating pipelines. Experimental investigations were carried out to identify the main factors influencing the friction degradation. It was found that beside stress and relative density of the surrounding soil, the amount of resistance degradation and also its rate are strongly affected by the magnitude of cyclic pipe movement and the number of load cycles. It could also be observed that the degradation can partly be healed dependent of the order of load packages, i.e. subsequent cycles with constant displacement amplitude. These findings necessitate a new consideration of soil resistance within the service life prediction. A calculation concept is introduced, which describes the axial friction resistance as a function of overburden height, pipeline diameter and soil’s relative density, but in addition also dependent on the actual relative movement between pipeline and soil as well as on the history of cyclic displacements. Thereby it becomes possible to calculate more realistic friction resistances for arbitrary points of time, distinct for every location within the network.
AB - The axial soil resistance is a crucial component within the design process of buried district heating pipelines and is known to degrade during the service life time due to axial movement of the pipeline under cyclic temperature loading. In current design methods, a large bandwidth of the coefficient of friction μ between pipe and soil is considered to account for this effect. However, a more accurate consideration of cyclic effects on the axial resistance could lead to a more economic design of district heating pipelines. Experimental investigations were carried out to identify the main factors influencing the friction degradation. It was found that beside stress and relative density of the surrounding soil, the amount of resistance degradation and also its rate are strongly affected by the magnitude of cyclic pipe movement and the number of load cycles. It could also be observed that the degradation can partly be healed dependent of the order of load packages, i.e. subsequent cycles with constant displacement amplitude. These findings necessitate a new consideration of soil resistance within the service life prediction. A calculation concept is introduced, which describes the axial friction resistance as a function of overburden height, pipeline diameter and soil’s relative density, but in addition also dependent on the actual relative movement between pipeline and soil as well as on the history of cyclic displacements. Thereby it becomes possible to calculate more realistic friction resistances for arbitrary points of time, distinct for every location within the network.
UR - http://www.scopus.com/inward/record.url?scp=85145590030&partnerID=8YFLogxK
U2 - 10.1201/9781003348443-331
DO - 10.1201/9781003348443-331
M3 - Conference contribution
AN - SCOPUS:85145590030
T3 - Current Perspectives and New Directions in Mechanics, Modelling and Design of Structural Systems - Proceedings of the 8th International Conference on Structural Engineering, Mechanics and Computation, 2022
SP - 2021
EP - 2027
BT - Current Perspectives and New Directions in Mechanics, Modelling and Design of Structural Systems - Proceedings of the 8th International Conference on Structural Engineering, Mechanics and Computation, 2022
A2 - Zingoni, Alphose
T2 - 8th International Conference on Structural Engineering, Mechanics and Computation, SEMC 2022
Y2 - 5 September 2022 through 7 September 2022
ER -