Structural performance of RC beams strengthened with hybrid bonded CFRP

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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Author(s)

Detail(s)

Original languageEnglish
Article number109178
Journal / PublicationJournal of Building Engineering
Volume88
Online published4 Apr 2024
Publication statusPublished - 1 Jul 2024

Abstract

Debonding at the interface between externally-bonded (EB) carbon fiber-reinforced polymer (CFRP) composites and the concrete limits the performance of CFRP-strengthened reinforced concrete (RC) beams. To mitigate the interface debonding and improve the material utilizing efficiency of CFRP, a hybrid-bonding (HB) technique was developed. HB CFRP system combines the adhesive bonding and mechanical fastening (i.e., anchoring the CFRP plate through bolted cover steel plate bonded on the surface of the CFRP plate). When interfacial debonding occurs, the friction between the steel cover plate and the CFRP plate and the reacted normal stress at the interface enhanced d the concrete aggregates interlocking and the bond strength of CFRP-to-concrete interface. Additionally, the normal stresses can be also activated through pre-tightening the anchors. Five HB CFRP-strengthened RC beams, two conventional EB CFRP-strengthened RC beams, and two un-strengthened RC beams were tested. Two different steel cover plates lengths and three different pre-tightening torques were adopted. The test results demonstrated that the HB technique improved the local bond behavior in the anchored regions, resulting in higher strength utilization efficiency of CFRP and increased load-carrying capacity of the strengthened beams. Such improvement was more significant when longer steel cover plates and higher pre-tightening torques were deployed. © 2024 Published by Elsevier Ltd.

Research Area(s)

  • Carbon fiber-reinforced polymer (CFRP), Hybrid bonding (HB) technique, Interfacial bond behavior, Mechanical fastener, RC beams, Strengthening

Citation Format(s)

Structural performance of RC beams strengthened with hybrid bonded CFRP. / Liu, Yun-Lin; Hong, Jia-Qiang; Deng, Jun et al.
In: Journal of Building Engineering, Vol. 88, 109178, 01.07.2024.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review