Details
| Original language | English |
|---|---|
| Title of host publication | Proceedings of the 20th fib Symposium, 2024 |
| Subtitle of host publication | ReConStruct - Resilient Concrete Structures |
| Editors | Richard S. Henry, Alessandro Palermo |
| Publisher | fib. The International Federation for Structural Concrete |
| Pages | 176-218 |
| Number of pages | 43 |
| ISBN (print) | 9782940643257 |
| Publication status | Published - 11 Nov 2024 |
| Event | 20th fib Symposium on ReConStruct: Resilient Concrete Structures, 2024 - Christchurch, New Zealand Duration: 11 Nov 2024 → 13 Nov 2024 |
Publication series
| Name | fib Symposium Proceedings |
|---|---|
| ISSN (Print) | 2617-4820 |
Abstract
Long-term deformations during the service life of concrete structures are predicted by creep models developed for constant loads. However, constant loads are usually superimposed by recurrent cyclic loads, for example, due to traffic. Measurements on existing reinforced and prestressed concrete bridges show that the deformations measured may be significantly higher than predicted, which is traced back to the effect of cyclic loading. Going one step further, constant creep loading and cyclic loading often occur in an alternating manner, the effect of which on the long-term deformations is more or less unknown. In the presented research, thus, the strain developments due to constant creep loading and alternating creep and cyclic loading are investigated for comparable stress levels on a normal-strength concrete C30/37. It is shown that periods of cyclic loading amplify the strain development in periods of constant creep loading and, furthermore, can significantly increase the strains. Therefore, the influence of cyclic loading on the longterm deformation behaviour of concrete needs to be considered for the improvement of existing guidelines as well as their underlying creep models.
Keywords
- alternating creep and cyclic loading, creep loading, normal strength concrete, stiffness, strain
ASJC Scopus subject areas
- Engineering(all)
- Civil and Structural Engineering
- Engineering(all)
- Building and Construction
- Materials Science(all)
- Materials Science (miscellaneous)
Cite this
- Standard
- Harvard
- Apa
- Vancouver
- BibTeX
- RIS
Proceedings of the 20th fib Symposium, 2024: ReConStruct - Resilient Concrete Structures. ed. / Richard S. Henry; Alessandro Palermo. fib. The International Federation for Structural Concrete, 2024. p. 176-218 (fib Symposium Proceedings).
Research output: Chapter in book/report/conference proceeding › Conference contribution › Research › peer review
}
TY - GEN
T1 - Load history dependent creep
T2 - 20th fib Symposium on ReConStruct: Resilient Concrete Structures, 2024
AU - Kern, B.
AU - Oneschkow, N.
AU - Podhajecky, A. L.
AU - Lohaus, L.
AU - Haist, M.
N1 - Publisher Copyright: © fédération internationale du béton (fib).
PY - 2024/11/11
Y1 - 2024/11/11
N2 - Long-term deformations during the service life of concrete structures are predicted by creep models developed for constant loads. However, constant loads are usually superimposed by recurrent cyclic loads, for example, due to traffic. Measurements on existing reinforced and prestressed concrete bridges show that the deformations measured may be significantly higher than predicted, which is traced back to the effect of cyclic loading. Going one step further, constant creep loading and cyclic loading often occur in an alternating manner, the effect of which on the long-term deformations is more or less unknown. In the presented research, thus, the strain developments due to constant creep loading and alternating creep and cyclic loading are investigated for comparable stress levels on a normal-strength concrete C30/37. It is shown that periods of cyclic loading amplify the strain development in periods of constant creep loading and, furthermore, can significantly increase the strains. Therefore, the influence of cyclic loading on the longterm deformation behaviour of concrete needs to be considered for the improvement of existing guidelines as well as their underlying creep models.
AB - Long-term deformations during the service life of concrete structures are predicted by creep models developed for constant loads. However, constant loads are usually superimposed by recurrent cyclic loads, for example, due to traffic. Measurements on existing reinforced and prestressed concrete bridges show that the deformations measured may be significantly higher than predicted, which is traced back to the effect of cyclic loading. Going one step further, constant creep loading and cyclic loading often occur in an alternating manner, the effect of which on the long-term deformations is more or less unknown. In the presented research, thus, the strain developments due to constant creep loading and alternating creep and cyclic loading are investigated for comparable stress levels on a normal-strength concrete C30/37. It is shown that periods of cyclic loading amplify the strain development in periods of constant creep loading and, furthermore, can significantly increase the strains. Therefore, the influence of cyclic loading on the longterm deformation behaviour of concrete needs to be considered for the improvement of existing guidelines as well as their underlying creep models.
KW - alternating creep and cyclic loading
KW - creep loading
KW - normal strength concrete
KW - stiffness
KW - strain
UR - http://www.scopus.com/inward/record.url?scp=85216934053&partnerID=8YFLogxK
M3 - Conference contribution
AN - SCOPUS:85216934053
SN - 9782940643257
T3 - fib Symposium Proceedings
SP - 176
EP - 218
BT - Proceedings of the 20th fib Symposium, 2024
A2 - Henry, Richard S.
A2 - Palermo, Alessandro
PB - fib. The International Federation for Structural Concrete
Y2 - 11 November 2024 through 13 November 2024
ER -