Experimental and analytical investigation on flexural behaviour of RC beams strengthened with NSM CFRP prestressed concrete prisms

Deng, Yu; Li, Zhenzhen; Zhang, Hexin; Corigliano, Alberto; Lam, Angus C.C.; Hansapinyo, Chayanon; Yang, Zhitao

Abstract

This investigation aims to study the flexural behaviour of reinforced concrete (RC) beams strengthened with near-surface mounted (NSM) carbon fibre reinforced polymer prestressed concrete prisms (CFRP-PCPs). Eight RC beams were tested under monotonic loading until the failure load was reached. One beam was un-strengthened to act as a control beam. The other seven beams were strengthened with non-prestressed or prestressed NSM CFRP-PCPs. The effects of bond length, prestress level, and concrete type of the CFRP-PCPs on the flexural capacity, flexural crack and deflection are discussed in this paper. The results indicate that the flexural capacity of RC beams strengthened with NSM CFRP-PCPs was greater than the control beam. An obvious improvement was discovered in the crack resistance when the RC beams were strengthened with prestressed NSM CFRP-PCPs. The strengthened beams showed a higher first-cracking, yielding, and ultimate load as the bond length and prestress level of CFRP-PCPs increased up to a critical level. The beams strengthened with CFRP-PCPs, which were cast with ultra-high performance concrete (UHPC), exhibited greater load capacity than the corresponding beams with epoxy resin mortar. The analytical model of flexural response for the NSM CFRP-PCPs strengthening beams is presented. The analytical results are in good agreement with the experimental results, which revealed the NSM CFRP-PCPs is an effective technique for flexural strengthening of the RC beams.

Citation

Deng, Y., Li, Z., Zhang, H., Corigliano, A., Lam, A. C., Hansapinyo, C., & Yang, Z. (2021). Experimental and analytical investigation on flexural behaviour of RC beams strengthened with NSM CFRP prestressed concrete prisms. Composite Structures, 257, Article 113385. https://doi.org/10.1016/j.compstruct.2020.113385

• Journal Article Type: Article
• Acceptance Date: Nov 21, 2020
• Online Publication Date: Dec 1, 2020
• Publication Date: 2021-02
• Deposit Date: Dec 1, 2020
• Publicly Available Date: Dec 2, 2021
• Journal: Composite Structures
• Print ISSN: 0263-8223
• Publisher: Elsevier
• Peer Reviewed: Peer Reviewed
• Volume: 257
• Article Number: 113385
• DOI: https://doi.org/10.1016/j.compstruct.2020.113385
• Public URL: http://researchrepository.napier.ac.uk/Output/2707082