Details
| Originalsprache | Englisch |
|---|---|
| Titel des Sammelwerks | Proceedings of the 8th International Conference on Fibre-Reinforced Polymer (FRP) Composites in Civil Engineering, CICE 2016 |
| Herausgeber/-innen | J.G. Dai, J.G. Teng |
| Seiten | 1164-1171 |
| Seitenumfang | 8 |
| ISBN (elektronisch) | 9789881448026 |
| Publikationsstatus | Veröffentlicht - 2016 |
| Extern publiziert | Ja |
| Veranstaltung | 8th International Conference on Fibre-Reinforced Polymer (FRP) Composites in Civil Engineering, CICE 2016 - Hong Kong, China Dauer: 14 Dez. 2016 → 16 Dez. 2016 |
Publikationsreihe
| Name | Proceedings of the 8th International Conference on Fibre-Reinforced Polymer (FRP) Composites in Civil Engineering, CICE 2016 |
|---|
Abstract
Although there exits many studies that have shown that CFRP-strengthening of cracked steel elements can extend the fatigue life substantially, there is not many researches on the design criterion that can guarantee a complete fatigue crack arrest in steel. This paper aims to give a better understanding about the design of CFRP retrofit solutions that can assure a fatigue crack arrest in damaged steel members subjected to cyclic loads. The concepts of crack closure, fatigue thresholds and effective stress intensity factor (SIF) are briefly explained. A fracture-based analytical solution is used to estimate the overall SIF of a cracked steel beam retrofitted by pre-stressed CFRP plate. In order to verify the accuracy of the proposed retrofit concept, three steel beams were strengthened by pre-stressed un-bonded CFRP plates. Before strengthening, all beams were notched, and subsequently were subjected to pre-cycling to create sharp cracks with different sizes of 3 mm, 20 mm and 40 mm. The specimens were then strengthened with different CFRP pre-stress levels of 10%, 20% and 30%. Finally, the specimens were subjected to cyclic loading. It has been shown that as long as the overall SIF at the crack tip is zero (or negative), the crack does not propagate, and a complete fatigue crack arrest can be achieved.
ASJC Scopus Sachgebiete
- Ingenieurwesen (insg.)
- Tief- und Ingenieurbau
- Werkstoffwissenschaften (insg.)
- Polymere und Kunststoffe
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- BibTex
- RIS
Proceedings of the 8th International Conference on Fibre-Reinforced Polymer (FRP) Composites in Civil Engineering, CICE 2016. Hrsg. / J.G. Dai; J.G. Teng. 2016. S. 1164-1171 (Proceedings of the 8th International Conference on Fibre-Reinforced Polymer (FRP) Composites in Civil Engineering, CICE 2016).
Publikation: Beitrag in Buch/Bericht/Sammelwerk/Konferenzband › Aufsatz in Konferenzband › Forschung › Peer-Review
}
TY - GEN
T1 - Mode-I fatigue crack arrest in metallic girders using Pre-Stressed Un-Bonded CFRP plates
AU - Ghafoori, Elyas
AU - Motavalli, Masoud
PY - 2016
Y1 - 2016
N2 - Although there exits many studies that have shown that CFRP-strengthening of cracked steel elements can extend the fatigue life substantially, there is not many researches on the design criterion that can guarantee a complete fatigue crack arrest in steel. This paper aims to give a better understanding about the design of CFRP retrofit solutions that can assure a fatigue crack arrest in damaged steel members subjected to cyclic loads. The concepts of crack closure, fatigue thresholds and effective stress intensity factor (SIF) are briefly explained. A fracture-based analytical solution is used to estimate the overall SIF of a cracked steel beam retrofitted by pre-stressed CFRP plate. In order to verify the accuracy of the proposed retrofit concept, three steel beams were strengthened by pre-stressed un-bonded CFRP plates. Before strengthening, all beams were notched, and subsequently were subjected to pre-cycling to create sharp cracks with different sizes of 3 mm, 20 mm and 40 mm. The specimens were then strengthened with different CFRP pre-stress levels of 10%, 20% and 30%. Finally, the specimens were subjected to cyclic loading. It has been shown that as long as the overall SIF at the crack tip is zero (or negative), the crack does not propagate, and a complete fatigue crack arrest can be achieved.
AB - Although there exits many studies that have shown that CFRP-strengthening of cracked steel elements can extend the fatigue life substantially, there is not many researches on the design criterion that can guarantee a complete fatigue crack arrest in steel. This paper aims to give a better understanding about the design of CFRP retrofit solutions that can assure a fatigue crack arrest in damaged steel members subjected to cyclic loads. The concepts of crack closure, fatigue thresholds and effective stress intensity factor (SIF) are briefly explained. A fracture-based analytical solution is used to estimate the overall SIF of a cracked steel beam retrofitted by pre-stressed CFRP plate. In order to verify the accuracy of the proposed retrofit concept, three steel beams were strengthened by pre-stressed un-bonded CFRP plates. Before strengthening, all beams were notched, and subsequently were subjected to pre-cycling to create sharp cracks with different sizes of 3 mm, 20 mm and 40 mm. The specimens were then strengthened with different CFRP pre-stress levels of 10%, 20% and 30%. Finally, the specimens were subjected to cyclic loading. It has been shown that as long as the overall SIF at the crack tip is zero (or negative), the crack does not propagate, and a complete fatigue crack arrest can be achieved.
KW - Bridge metallic girders
KW - Carbon fibre-reinforced polymer (CFRP)
KW - Fatigue crack arrest
KW - Steel strengthening
UR - http://www.scopus.com/inward/record.url?scp=85049883356&partnerID=8YFLogxK
M3 - Conference contribution
AN - SCOPUS:85049883356
T3 - Proceedings of the 8th International Conference on Fibre-Reinforced Polymer (FRP) Composites in Civil Engineering, CICE 2016
SP - 1164
EP - 1171
BT - Proceedings of the 8th International Conference on Fibre-Reinforced Polymer (FRP) Composites in Civil Engineering, CICE 2016
A2 - Dai, J.G.
A2 - Teng, J.G.
T2 - 8th International Conference on Fibre-Reinforced Polymer (FRP) Composites in Civil Engineering, CICE 2016
Y2 - 14 December 2016 through 16 December 2016
ER -