Flexural Strength of RC Beam Strengthened by Partially De-bonded Near Surface-Mounted FRP Strip
Source abstract
Abstract
This paper presents an experimental work to study the flexural strength of reinforced concrete (RC) beams strengthened by partially de-bonded near surface-mounted (NSM) fiber reinforced polymer (FRP) strip with various de-bonded length. Especially, considering high anchorage capacity at end of a FRP strip, the effect of de-bonded region at a central part was investigated. In order to check the improvement of strength or deformation capacity when the bonded surface area only increased without changing the FRP area, single and triple lines of FRP were planned. In addition, the flexural strength of the RC member strengthened by a partially de-bonded NSM FRP strip was evaluated by using the existing researchers’ strength equation to predict the flexural strength after retrofit. From the study, it was found that where de-bonded region exists in the central part of a flexural member, the deformation capacity of the member is expected to be improved, because FRP strain is not to be concentrated on the center but to be extended uniformly in the de-bonded region. Where NSM FRP strips are distributed in triple lines, a relatively high strength can be exerted due to the increase of bond strength in the anchorage.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Structural Behavior of Reinforced Concrete · Concrete Corrosion and Durability · Innovative concrete reinforcement materials
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (21)
Show source-provided references
1. ACI Committee 440. (2002). Guide for the design and construction of concrete reinforced with FRP bars (ACI 440.2R-02). American Concrete Institute.
2. Ali, M., Oehlers, D., Friffith, M., & Seracino, R. (2008). Interfacial stress transfer of near surface-mounted FRP-to-concrete joints. Engineering Structures, 30(7), 1861–1868.10.1016/j.engstruct.2007.12.006 ↗
3. Al-Mahmoud, F., Castel, A., & Francois, R. (2012). Failure modes and failure mechanisms of RC members strengthened by NSM CFRP composites—Analysis of pull-out failure mode. Composites Part B: Engineering, 43(4), 1893–1901.10.1016/j.compositesb.2012.01.020 ↗
4. Ceroni, F., Pecce, M., Bilotta, A., & Nigro, E. (2012). Bond behavior of FRP NSM systems in concrete elements. Composites Part B: Engineering, 43(2), 99–109.10.1016/j.compositesb.2011.10.017 ↗
5. Chahrour, A., & Soudki, K. (2005). Flexural response of reinforced concrete beams strengthened with end-anchored partially bonded carbon fiber-reinforced polymer strips. Journal of Composite Construction, 9(2), 170–177.10.1061/(ASCE)1090-0268(2005)9:2(170) ↗
6. Choi, H., West, J., & Soudki, K. (2008). Analysis of the flexural behavior of partially bonded FRP strengthened concrete beams. Journal of Composites for Construction, 12(4), 375–386.10.1061/(ASCE)1090-0268(2008)12:4(375) ↗
7. Choi, H., West, J., & Soudki, K. (2011). Partially bonded near-surface-mounted CFRP bars for strengthened concrete T-beams. Construction and Building Materials, 25, 2441–2449.10.1016/j.conbuildmat.2010.11.056 ↗
8. EI-Hacha, R., & Rizkalla, S. (2004). Near surface-mounted fiber-reinforced polymer reinforcements for flexural strengthening of concrete structures. ACI Structural Journal, 101(5), 717–726.
9. Fib TG9.3. (2001). Externally bonded FRP reinforcement for RC structures. Technical report on the design and use of externally Bonded Fibre reinforced Polymer Reinforcement (FRP EBR) for reinforced Concrete Structures. International Federation for Structural Concrete.
10. Hassan, T., & Rizkalla, S. (2003). Investigation of bond in concrete structures strengthened with near surface mounted carbon fiber reinforced polymer strips. Journal of Composite Construction, 7(3), 248–257.10.1061/(ASCE)1090-0268(2003)7:3(248) ↗
11. Jose, S., & Barros, J. (2007). A pullout test for the near surface mounted CFRP-concrete bond characterization. In Conference of Sociedade Portuguesa de Materials, 13, Porto, Portugal.
12. Lee, D., Cheng, L., & Hui, J. (2013). Bond characteristics of various NSM FRP reinforcements in concrete. Journal of Composites for Construction, 17(1), 117–129.10.1061/(ASCE)CC.1943-5614.0000318 ↗
13. Lorenzis, D., Nanni, L., & Tegola, L. (2000). Flexural and shear strengthening of reinforced concrete structures with near surface mounted FRP rods. In Proceeding of the 3rd international conference on advanced composite materials in bridges and structures (ACMBS III) (pp. 521–528).
14. Nanni, A. (2000). FRP reinforcement for bridge structures. Proceedings of structural engineering conference beams. Journal of Composites for Construction (ASCE), 5(1), 12–17.
15. Rezazadeh, M., & Barros, J. (2015). Transfer zone of prestressed CFRP reinforcement applied according to NSM technique for strengthening of RC structures. Composites Part B: Engineering, 79(15), 581–594.10.1016/j.compositesb.2015.05.023 ↗
16. Seo, S. (2012). Bond strength of near surface-mounted FRP plate in RC member. Journal of the Korea Concrete Institute, 24(4), 415–422 (in Korean).10.4334/JKCI.2012.24.4.415 ↗
17. Seo, S., Feo, L., & Hui, D. (2013). Bond strength of near surface-mounted FRP plate for retrofit of concrete structures. Composite Structures, 95, 719–727.10.1016/j.compstruct.2012.08.038 ↗
18. Seracino, R., Jones, N., Ali, M., Page, M., & Oehlers, D. (2007a). Bond strength of near-surface mounted FRP strip-to-concrete joints. Journal of Composite Construction, 11(4), 401–409.10.1061/(ASCE)1090-0268(2007)11:4(401) ↗
19. Seracino, R., Raizal, S., & Oehlers, D. (2007b). Generic debonding resistance of EB and NSM plate-to-concrete joints. Journal of Composite Construction, 11(1), 62–70.10.1061/(ASCE)1090-0268(2007)11:1(62) ↗
20. Sharaky, I., Torres, L., Comas, J., & Barris, C. (2014). Flexural response of reinforced concrete (RC) beams strengthened with near surface mounted (NSM) fibre reinforced polymer (FRP) bars. Composite Structures, 109, 8–22.10.1016/j.compstruct.2013.10.051 ↗
21. Yost, J., Gross, S., Dinehart, D., & Mildenberg, J. (2007). Flexural behavior of concrete beams strengthened with near surface-mounted CFRP strips. ACI Structural Journal, 104(4), 430–437.