Abstract
This paper aims to disclose the influence law of cracks on instantaneous and long-term deflections of reinforced beam. For this purpose, four concrete beams were created, pre-loaded to varied degrees of cracking, and reinforced with carbon fibre reinforced polymer (CFRP). Then, a 300-day load test was carried out on these samples to measure the instantaneous and long-term deflections. The experimental results show that the pre-cracking degree has little influence on instantaneous deflection; whether a beam is pre-cracked or intact, the final deflection of the beam is mostly affected by its initial deflection before the reinforcement; the pre-cracking degree is negatively correlated to the magnitude of additional deflection under sustained load. The research findings lay the basis for judging whether a reinforced beam can be used normally in the long run.
Highlights
T hanks to its light weight, high strength and good corrosion resistance, carbon fibre reinforced polymer (CFRP) has been widely used to strengthen and reinforce concrete structures [1]
Sungnam Hong et al [7] conducted a 550-day creep experiment on three concrete beams, namely, concrete beams reinforced by the CFRP, concrete beams enhanced by glass fibre reinforced polymer
Kim [10] carried out a 300-day load test on a glass fibre reinforced polymer (GFRP)-reinforced beam and a CFRP-reinforced beam, and measured the beam deflection, concrete strain, internal rebar strain, and fibre reinforced plastic (FRP) strain during the loading
Summary
T hanks to its light weight, high strength and good corrosion resistance, carbon fibre reinforced polymer (CFRP) has been widely used to strengthen and reinforce concrete structures [1]. All the above long-term load tests show that the ultimate deflection of directly reinforced beam with no cracks directly hinges on the level of external load and the degree of reinforcement, and that the long-term deflection can be partially constrained by the reinforcement (e.g. CFRP and GFRP). During Rao’s research, two reinforced concrete beams were loaded to the same level; one of them was reinforced with the CFRP after its deformation, while the other was directly taken as the control. To make up for the gap, this paper attempts to disclose the effect of cracks on instantaneous and long-term deflections of reinforced beams For this purpose, four concrete beams were created, pre-loaded to varied degrees of cracking, and reinforced with the CFRP. The research findings provide a valuable reference for actual reinforcement projects
Sign-in/Register to view highlights & summary 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.
