Comparative study on the flexural strengthening of RC beams using EB CFRP sheets, NSM CFRP bars, P-SWRs, and their combinations
- 26 November 2020
- journal article
- research article
- Published by SAGE Publications in Advances in Structural Engineering
- Vol. 24 (5), 1009-1023
- https://doi.org/10.1177/1369433220971729
Abstract
The externally bonded (EB) carbon fiber reinforced polymer (CFRP), near-surface-mounted (NSM) CFRP and the prestressed steel wire ropes (P-SWRs) has been proven to be feasible and reliable flexural strengthening methods for concrete structures. However, debonding issues in EB CFRP sheets (or NSM CFRP bars) and space requirements for edge and spacing clearance of NSM CFRP bars (or P-SWRs) has limited the application of these three strengthening techniques. Therefore, the combinations of these methods need to be investigated and clarified. In this paper, experimental investigations on the flexural performances of seven concrete beams are presented, in which three of the beams were separately strengthened with EB CFRP sheets, NSM CFRP bars, and P-SWRs, respectively, and three of the beams were combinedly strengthened with two of the three techniques. Test results demonstrated that the flexural performances of beams strengthened with the combination with EB CFRP sheets, NSM CFRP bars, and P-SWRs are between the flexural performances of the beams strengthened with the corresponding individual strengthening techniques. It is found that the P-SWRs is favorable for combinations. In case the P-SWRs was combined with EB CFRP sheets or NSM CFRP bars for strengthening, the cracking load was increased to more than 230% and the maximum ultimate load-bearing capacity was increased to 150% when compared with the control beam. The debonding which occurred more or less in the beams strengthened with EB CFRP sheets or NSM CFRP bars or their combination was successfully eliminated by using the combination strengthening technique with P-SWRs. Also, the combination of P-SWRs with EB CFRP sheets or NSM CFRP bars is also favorable to improve the ductility of strengthened beams.Keywords
Funding Information
- Fundamental Research Funds for the Central Universities (2242019R20004)
- China Postdoctoral Science Foundation (2018M642142)
- International Postdoctoral Exchange Program (202521)
This publication has 23 references indexed in Scilit:
- A state-of-the-art review: Near-surface mounted FRP composites for reinforced concrete structuresConstruction and Building Materials, 2019
- Strengthening of RC Beams Using Externally Bonded Reinforcement Combined with Near-Surface Mounted TechniquePolymers, 2016
- Accuracy of design‐oriented formulations for evaluating the flexural and shear capacities of FRP‐strengthened RC beamsStructural Concrete, 2016
- Strengthening of shear critical RC beams with various FRP systemsConstruction and Building Materials, 2014
- Flexural strengthening of concrete beams using CFRP, GFRP and hybrid FRP sheetsConstruction and Building Materials, 2012
- Numerical investigation of the parameters influencing the behaviour of FRP shear-strengthened beamsConstruction and Building Materials, 2012
- Behavior of FRP-Retrofitted Joints Built with Plain Bars and Low-Strength ConcreteJournal of Composites for Construction, 2011
- Strengthening of RC members with near-surface mounted CFRP rodsComposite Structures, 2009
- Tests of reinforced concrete beams strengthened with wire rope unitsEngineering Structures, 2007
- Near-surface mounted FRP reinforcement: An emerging technique for strengthening structuresComposites Part B: Engineering, 2007