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Effect of CFRP anchorages on the flexural behavior of externally strengthened reinforced concrete beams
https://orcid.org/http://orcid.org/0000-0002-2718-6816
Advanced composite materials in the form of fiber-reinforced polymer (FRP) have been gaining popularity in the construction industry. One of the main challenges of using externally bonded FRP in repair and strengthening applications is its susceptibility to peeling-off or delamination without achieving the full capacity of the FRP material. Anchoring the FRP laminates has been deemed effective in delaying debonding failure, thus ensuring load continuity between the concrete and FRP. This paper aims to study the effect of two anchorage systems on the strength and ductility of reinforced concrete (RC) beams strengthened with carbon FRP (CFRP) laminates. The anchors considered in this study were end U-wraps and CFRP spike anchors. A total of seven RC beams were cast and strengthened with different arrangements of CFRP laminates and anchors. The test parameters investigated in this study include the length of the FRP sheet, type of anchor, and the number of CFRP spike anchors. Test results showed that flexural strengthening using CFRP laminates enhanced the capacity of the unstrengthened beam by 16–41% at the expense of ductility. Using full-length CFRP sheets significantly improved the overall performance of the beams as opposed to short-length CFRP sheets. Out of the anchored specimens, the best improvement in the capacity was achieved in the specimen anchored with end U-wraps. CFRP spike anchors provided limited enhancement in the load-carrying capacity of the specimens. The efficiency of the spike anchors could be upgraded if longer embedment depth and larger dowel diameter were used. Finally, the ACI440.2R-17 strength predictions were in good agreement with the experimental results.
Effect of CFRP anchorages on the flexural behavior of externally strengthened reinforced concrete beams
https://orcid.org/http://orcid.org/0000-0002-2718-6816
Advanced composite materials in the form of fiber-reinforced polymer (FRP) have been gaining popularity in the construction industry. One of the main challenges of using externally bonded FRP in repair and strengthening applications is its susceptibility to peeling-off or delamination without achieving the full capacity of the FRP material. Anchoring the FRP laminates has been deemed effective in delaying debonding failure, thus ensuring load continuity between the concrete and FRP. This paper aims to study the effect of two anchorage systems on the strength and ductility of reinforced concrete (RC) beams strengthened with carbon FRP (CFRP) laminates. The anchors considered in this study were end U-wraps and CFRP spike anchors. A total of seven RC beams were cast and strengthened with different arrangements of CFRP laminates and anchors. The test parameters investigated in this study include the length of the FRP sheet, type of anchor, and the number of CFRP spike anchors. Test results showed that flexural strengthening using CFRP laminates enhanced the capacity of the unstrengthened beam by 16–41% at the expense of ductility. Using full-length CFRP sheets significantly improved the overall performance of the beams as opposed to short-length CFRP sheets. Out of the anchored specimens, the best improvement in the capacity was achieved in the specimen anchored with end U-wraps. CFRP spike anchors provided limited enhancement in the load-carrying capacity of the specimens. The efficiency of the spike anchors could be upgraded if longer embedment depth and larger dowel diameter were used. Finally, the ACI440.2R-17 strength predictions were in good agreement with the experimental results.
Effect of CFRP anchorages on the flexural behavior of externally strengthened reinforced concrete beams
https://orcid.org/http://orcid.org/0000-0002-2718-6816
Advanced composite materials in the form of fiber-reinforced polymer (FRP) have been gaining popularity in the construction industry. One of the main challenges of using externally bonded FRP in repair and strengthening applications is its susceptibility to peeling-off or delamination without achieving the full capacity of the FRP material. Anchoring the FRP laminates has been deemed effective in delaying debonding failure, thus ensuring load continuity between the concrete and FRP. This paper aims to study the effect of two anchorage systems on the strength and ductility of reinforced concrete (RC) beams strengthened with carbon FRP (CFRP) laminates. The anchors considered in this study were end U-wraps and CFRP spike anchors. A total of seven RC beams were cast and strengthened with different arrangements of CFRP laminates and anchors. The test parameters investigated in this study include the length of the FRP sheet, type of anchor, and the number of CFRP spike anchors. Test results showed that flexural strengthening using CFRP laminates enhanced the capacity of the unstrengthened beam by 16–41% at the expense of ductility. Using full-length CFRP sheets significantly improved the overall performance of the beams as opposed to short-length CFRP sheets. Out of the anchored specimens, the best improvement in the capacity was achieved in the specimen anchored with end U-wraps. CFRP spike anchors provided limited enhancement in the load-carrying capacity of the specimens. The efficiency of the spike anchors could be upgraded if longer embedment depth and larger dowel diameter were used. Finally, the ACI440.2R-17 strength predictions were in good agreement with the experimental results.
Effect of CFRP anchorages on the flexural behavior of externally strengthened reinforced concrete beams
Archiv.Civ.Mech.Eng
Abdalla, Jamal A. (Autor:in) / Ali, Alnadher B. (Autor:in) / Hawileh, Rami A. (Autor:in) / Mhanna, Haya H. (Autor:in) / Galal, Khalid E. (Autor:in) / Saqan, Elias I. (Autor:in)
09.10.2023
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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