Flexural performance of RC beams strengthened with prestressed CFRP sheets

Piyong Yu, Pedro F. Silva, Antonio Nanni

Research output: Contribution to journalConference articlepeer-review

10 Scopus citations


A mechanical device for prestressing carbon fiber reinforced polymers (CFRP) sheets and its application for the flexural strengthening of reinforced concrete (RC) beams are discussed in this paper. Significant features of this mechanical device are that the CFRP sheets can be anchored directly to the mechanical device, and prestressing forces can be applied manually without the need for hydraulic jacks. The physical principle behind this mechanical device relies on: (1) prestressing a CFRP sheet that is initially straight and anchored between two points; and (2) applying a small uplift displacement at two other points that are located at a small distance away from the anchoring points. In this manner, the force necessary to create the uplift displacement can be much smaller than the force required to impose the initial prestressing on the CFRP sheets, and the uplift force may be imposed without the need for hydraulic jacks. Test results showed that the manual mechanical device proved to be practical and safe for prestressing CFRP sheets. Moreover, there is no limit for its application to other types of FRP systems. In this research program, three reinforced concrete (RC) beams were tested to investigate the feasibility of this concept for flexural strengthening. One of the beams was retrofitted with one prestressed CFRP sheet, another was also retrofitted with a CFRP sheet but it was left unprestressed. The third beam was used as the control beam. The three RC beams were then tested to ultimate condition under a four-point loading test setup. Test results showed that after strengthening with the prestressed CFRP sheet, flexural strength and serviceability of the retrofitted RC beam was increased significantly.

Original languageEnglish (US)
Pages (from-to)2759-2768
Number of pages10
JournalInternational SAMPE Symposium and Exhibition (Proceedings)
StatePublished - Dec 1 2004
Externally publishedYes
Event49th International SAMPE Symposium and Exhibition: Materials and Processing Technology - 60 Years of SAMPE Progress, SAMPE 2004 - Long Beach, CA, United States
Duration: May 16 2004May 20 2004


  • Carbon Fiber
  • Composite Material
  • Reinforced Concrete

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering


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