Abstract
When fibre-reinforced polymer (FRP) plates are applied to strengthen steel beams, the strengthening relies upon the structural adhesive to transfer load between the FRP plate and the steel structure. When the ambient temperature approaches the glass transition temperature (Tg) of the adhesive; however, the adhesive becomes viscoelastic, which could have a significant effect upon its long-term service performance. This paper investigates the impact of nonlinear creep at elevated service temperatures upon bonded FRP-strengthened steel beams. It is an analytical study, based upon experimental characterisation of the adhesive. The adhesive nonlinear response was obtained using a dynamic mechanical analyser (DMA) multiple stress creep-recovery test. These results were incorporated into a nonlinear viscoelastic finite element model to predict the displacement across the adhesive joint caused by adhesive creep. The model provides an analysis of a strengthened steel beam’s long-term behaviour at warm temperatures. The analytical results demonstrate that as the temperature rises and the viscoelasticity develops, increased slip occurs between the FRP plate and steel beam, which could reduce the effectiveness of the strengthening.
| Original language | English |
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| Number of pages | 4 |
| Publication status | Published - 10 Dec 2019 |
| Event | 7th Asia-Pacific Conference on FRP in Structures, APFIS 2019 - Brisbane, Australia Duration: 10 Dec 2019 → 13 Dec 2019 |
Conference
| Conference | 7th Asia-Pacific Conference on FRP in Structures, APFIS 2019 |
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| Country/Territory | Australia |
| City | Brisbane |
| Period | 10/12/19 → 13/12/19 |
Keywords / Materials (for Non-textual outputs)
- Bonded strengthening
- Creep
- Nonlinear viscoelasticity
- Structural adhesive