Details
| Original language | English |
|---|---|
| Title of host publication | Proceedings of the 7th International Conference on FRP Composites in Civil Engineering, CICE 2014 |
| Editors | Raafat El-Hacha |
| ISBN (electronic) | 9781771363082 |
| Publication status | Published - 2014 |
| Externally published | Yes |
| Event | 7th International Conference on FRP Composites in Civil Engineering, CICE 2014 - Vancouver, Canada Duration: 20 Aug 2014 → 22 Aug 2014 |
Publication series
| Name | Proceedings of the 7th International Conference on FRP Composites in Civil Engineering, CICE 2014 |
|---|
Abstract
The majority of fatigue strengthening studies using CFRP materials focus on reducing propagation rates of existing cracks or flaws, ignoring the crack initiation stage. However, many existing metallic bridge members do not contain existing cracks, but rather are nearing their design fatigue life wherein crack initiation is approaching. Limited research exists on the prevention of crack initiation using CFRP materials. In this paper, the use of CFRP plates with tuned degrees of pre-stress are investigated, to extend steel bridge member fatigue life (prevent crack initiation). The modified Goodman constant life diagram (CLD) is used to determine the safe regime of constant amplitude loading required to extend an existing member into the infinite fatigue-life zone. Following, the minimum level of CFRP pre-stress is determined to achieve this safe loading regime, and experimental testing of four metallic beams containing pre-stress CFRP retrofits validate the proposed method. Experimental results show that strengthening using pre-stressed CFRP plates can shift the working stresses from a finite fatigue-life zone to an infinite fatigue-life zone indefinitely preventing crack initiation.
ASJC Scopus subject areas
- Materials Science(all)
- Polymers and Plastics
- Engineering(all)
- Civil and Structural Engineering
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Proceedings of the 7th International Conference on FRP Composites in Civil Engineering, CICE 2014. ed. / Raafat El-Hacha. 2014. (Proceedings of the 7th International Conference on FRP Composites in Civil Engineering, CICE 2014).
Research output: Chapter in book/report/conference proceeding › Conference contribution › Research › peer review
}
TY - GEN
T1 - Constant life diagrams to prevent fatigue crack initiation in metallic beams using CFRP plates
AU - Ghafoori, Elyas
AU - Motavalli, Masoud
AU - Nussbaumer, Alain
AU - Herwig, Andrin
AU - Prinz, Gary S.
AU - Fontana, Mario
AU - Zhao, Xiao Ling
PY - 2014
Y1 - 2014
N2 - The majority of fatigue strengthening studies using CFRP materials focus on reducing propagation rates of existing cracks or flaws, ignoring the crack initiation stage. However, many existing metallic bridge members do not contain existing cracks, but rather are nearing their design fatigue life wherein crack initiation is approaching. Limited research exists on the prevention of crack initiation using CFRP materials. In this paper, the use of CFRP plates with tuned degrees of pre-stress are investigated, to extend steel bridge member fatigue life (prevent crack initiation). The modified Goodman constant life diagram (CLD) is used to determine the safe regime of constant amplitude loading required to extend an existing member into the infinite fatigue-life zone. Following, the minimum level of CFRP pre-stress is determined to achieve this safe loading regime, and experimental testing of four metallic beams containing pre-stress CFRP retrofits validate the proposed method. Experimental results show that strengthening using pre-stressed CFRP plates can shift the working stresses from a finite fatigue-life zone to an infinite fatigue-life zone indefinitely preventing crack initiation.
AB - The majority of fatigue strengthening studies using CFRP materials focus on reducing propagation rates of existing cracks or flaws, ignoring the crack initiation stage. However, many existing metallic bridge members do not contain existing cracks, but rather are nearing their design fatigue life wherein crack initiation is approaching. Limited research exists on the prevention of crack initiation using CFRP materials. In this paper, the use of CFRP plates with tuned degrees of pre-stress are investigated, to extend steel bridge member fatigue life (prevent crack initiation). The modified Goodman constant life diagram (CLD) is used to determine the safe regime of constant amplitude loading required to extend an existing member into the infinite fatigue-life zone. Following, the minimum level of CFRP pre-stress is determined to achieve this safe loading regime, and experimental testing of four metallic beams containing pre-stress CFRP retrofits validate the proposed method. Experimental results show that strengthening using pre-stressed CFRP plates can shift the working stresses from a finite fatigue-life zone to an infinite fatigue-life zone indefinitely preventing crack initiation.
UR - http://www.scopus.com/inward/record.url?scp=85067781029&partnerID=8YFLogxK
M3 - Conference contribution
AN - SCOPUS:85067781029
T3 - Proceedings of the 7th International Conference on FRP Composites in Civil Engineering, CICE 2014
BT - Proceedings of the 7th International Conference on FRP Composites in Civil Engineering, CICE 2014
A2 - El-Hacha, Raafat
T2 - 7th International Conference on FRP Composites in Civil Engineering, CICE 2014
Y2 - 20 August 2014 through 22 August 2014
ER -