TY - GEN
T1 - Experimental Analysis of R.C. Beams Preloaded, Repaired and Flexural Strengthened with Carbon Fibre Reinforced Polymer (CFRP)
AU - da Costa Santos, Juliane
AU - da Costa Santos, Ana Caroline
AU - Archbold, Paul
AU - Puppi, Rogério Francisco Küster
N1 - Publisher Copyright:
© 2022, The Author(s), under exclusive license to Springer Nature Switzerland AG.
PY - 2022
Y1 - 2022
N2 - Concrete is a material widely applicable in structures all over the world. Therefore, its deterioration and problems caused over time are inevitable. Considering this fact, the structures of concrete recovery is a real need. There are numerous techniques structural recover and repair. The system using carbon fibre reinforced polymer (CFRP) is among them. CFRP is lightweight, presents high tensile strength and is easy to be installed. This research presents an experimental analysis about the monotonic flexural behaviour and ultimate capacity of ten reinforced concrete beams partially damaged and cracked after preloading in flexure. The beams were externally repaired using one or two layers of CFRP fabrics and bonded with epoxy resin over a pre-treated substrate aiming better adhesion. Each beam was loaded and tested by a flexural tensile strength in four points bending test. The ultimate load and maximum deflection were recorded. The aim of this study was to verify the effectiveness of the CFRP as strengthening of the damaged structure of reinforced concrete. It was observed that specimens strengthened with one layer of CFRP increased, in average, 49,70% of the flexural tensile strength while using two layers improved it in 56,66% when compared to the control beams with no additional external reinforcement. When analysing the actual behaviour of the CFRP reinforced beams with the designed, it was observed an average achievement 4,65% less than the expected for the group using one layer and 5,05% less with 2 layers of CFRP. Therefore, the accuracy of the results was satisfactory when compared to previous values obtained. During the structural analysis, it was observed that the shear force caused the failure of the beams. Additionally, it was verified the effectiveness of the CFRP when used as an external strengthening to recover the damaged structures of reinforced concrete studied, submitted to their ultimate flexural tensile load.
AB - Concrete is a material widely applicable in structures all over the world. Therefore, its deterioration and problems caused over time are inevitable. Considering this fact, the structures of concrete recovery is a real need. There are numerous techniques structural recover and repair. The system using carbon fibre reinforced polymer (CFRP) is among them. CFRP is lightweight, presents high tensile strength and is easy to be installed. This research presents an experimental analysis about the monotonic flexural behaviour and ultimate capacity of ten reinforced concrete beams partially damaged and cracked after preloading in flexure. The beams were externally repaired using one or two layers of CFRP fabrics and bonded with epoxy resin over a pre-treated substrate aiming better adhesion. Each beam was loaded and tested by a flexural tensile strength in four points bending test. The ultimate load and maximum deflection were recorded. The aim of this study was to verify the effectiveness of the CFRP as strengthening of the damaged structure of reinforced concrete. It was observed that specimens strengthened with one layer of CFRP increased, in average, 49,70% of the flexural tensile strength while using two layers improved it in 56,66% when compared to the control beams with no additional external reinforcement. When analysing the actual behaviour of the CFRP reinforced beams with the designed, it was observed an average achievement 4,65% less than the expected for the group using one layer and 5,05% less with 2 layers of CFRP. Therefore, the accuracy of the results was satisfactory when compared to previous values obtained. During the structural analysis, it was observed that the shear force caused the failure of the beams. Additionally, it was verified the effectiveness of the CFRP when used as an external strengthening to recover the damaged structures of reinforced concrete studied, submitted to their ultimate flexural tensile load.
KW - CFRP
KW - Carbon fibre
KW - Reinforced concrete
KW - Structural repairs
KW - Structural strengthening
UR - http://www.scopus.com/inward/record.url?scp=85121932514&partnerID=8YFLogxK
U2 - 10.1007/978-3-030-88166-5_138
DO - 10.1007/978-3-030-88166-5_138
M3 - Conference contribution
AN - SCOPUS:85121932514
SN - 9783030881658
T3 - Lecture Notes in Civil Engineering
SP - 1587
EP - 1600
BT - 10th International Conference on FRP Composites in Civil Engineering - Proceedings of CICE 2020/2021
A2 - Ilki, Alper
A2 - Ispir, Medine
A2 - Inci, Pinar
PB - Springer Science and Business Media Deutschland GmbH
T2 - 10th International Conference on Fibre-Reinforced Polymer (FRP) Composites in Civil Engineering, CICE 2021
Y2 - 8 December 2021 through 10 December 2021
ER -