Abstract
In structural rehabilitation and strengthening, the structural members are often required to cope with larger design loading due to the upgrading of building services and design standard, while maintaining the member size to preserve the architectural dimensions and headroom. Moreover, durability enhancement by mitigating or eliminating the reinforcement corrosion problem is often desired. Concrete cracking is a major initiating and accelerating factor of the corrosion of steel reinforcement. The application of fibres is a prominent solution to the cracking problem. Furthermore, the fibres can increase the mechanical resistance of the strengthening systems. This study reveals the synergy effect of the combined application of steel fibres and external carbon fibre-reinforced polymer (CFRP) sheets. The investigation encompasses the use of fibre-reinforced polymer (FRP) reinforcing bars, discrete steel fibres, externally bonded and mechanically fastened FRP sheets in different combinations. It is discovered that the steel fibres can help to control concrete cracking and eventually alter the failure mode and enhance the flexural resistance. The FRP reinforcement system, together with the steel fibres, radically resolves the structural safety problem caused by corrosion of the steel bar reinforcement. Finally, the impact of the external sheet on the fire limit state performance needs to be resolved, such as by adopting fire protection rendering for the finishes layer.
Highlights
In structural rehabilitation and strengthening, the structural members are often required to cope with larger design loading due to the upgrading of building services and facilities and heightening of design standard, while maintaining the original member size to preserve the architectural dimensions and headroom
The capital letter “C” in the notation describes the provision of external carbon fibre-reinforced polymer (CFRP) sheet at the bottom surface of the beam, whereas the letter “F” denotes that the beam was produced from steel fibre-reinforced concrete
The application of steel fibres as distributed reinforcement could alter the failure character and flexuralofcapacity of composite beams with andcharacter increase theincrease flexuralthe capacity composite beams bonded with external external CFRP sheets
Summary
In structural rehabilitation and strengthening, the structural members are often required to cope with larger design loading due to the upgrading of building services and facilities and heightening of design standard, while maintaining the original member size to preserve the architectural dimensions and headroom. Previous research has proven the effectiveness of experimental study ofto steel fibre-reinforced concrete specimen combined with other strengthening externally-bonded sheets in structural retrofitting and strengthening [24,25]. The external sheet can be means, similarities can be drawn on the behaviour of partially reconstructed members in practical bonded to the concrete by constructional adhesive, or fastened mechanically to strengthening. To avert of steel fibres in preventing the formation of splitting cracks in concrete prisms bonded with external possible debonding of external sheets, a mechanical fastening system is applied so that potential carbon polymerbond (CFRP). The investigation encompasses the use of FRP reinforcing bars, discrete steel fibres, externally bonded and mechanically fastened FRP sheets in different combinations.
Sign-in/Register to view highlights & summary 
Published Version (
Free)
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
