EXPERIMENTAL RESEARCH ON SUPPRESSION OF DEBONDING IN FRRMC-PLATED RC BEAM AND SLAB ENDS BY USING OBLIQUE U-JACKET

FENG Baichuan; LIU Feng; FU Bing; HUANG Dongchao

doi:10.13204/j.gyjzG201903190009

Volume 51 Issue 4

Aug. 2021

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Article Navigation > INDUSTRIAL CONSTRUCTION > 2021 > 51(4): 189-193

FENG Baichuan, LIU Feng, FU Bing, HUANG Dongchao. EXPERIMENTAL RESEARCH ON SUPPRESSION OF DEBONDING IN FRRMC-PLATED RC BEAM AND SLAB ENDS BY USING OBLIQUE U-JACKET[J]. INDUSTRIAL CONSTRUCTION, 2021, 51(4): 189-193. doi: 10.13204/j.gyjzG201903190009

Citation:

FENG Baichuan, LIU Feng, FU Bing, HUANG Dongchao. EXPERIMENTAL RESEARCH ON SUPPRESSION OF DEBONDING IN FRRMC-PLATED RC BEAM AND SLAB ENDS BY USING OBLIQUE U-JACKET[J]. INDUSTRIAL CONSTRUCTION, 2021, 51(4): 189-193. doi: 10.13204/j.gyjzG201903190009

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EXPERIMENTAL RESEARCH ON SUPPRESSION OF DEBONDING IN FRRMC-PLATED RC BEAM AND SLAB ENDS BY USING OBLIQUE U-JACKET

doi: 10.13204/j.gyjzG201903190009

1.;
2. MOE Key Lab of Disaster Forecast and Control in Engineering, Jinan University, Guangzhou 510632, China

Received Date: 2020-10-20
Available Online: 2021-08-19

Abstract

Abstract

Fiber-reinforced polymer (FRP) composites are widely externally bonded on or near surface mounted into the tension side of reinforced concrete (RC) beams to enhance the flexural capacity. Such a technique becomes one of the mainstream techniques for the flexural strengthening of RC beams. FRP plated RC beams usually fail due to debonding failure in either intermediate crack induced debonding (IC debonding) or concrete cover debonding. The debonding failure usually occurs with the maximum strain of the FRP being only 20%~40% of its rupture strain, thus limiting the utilization of the high tensile strength of the materials. Appropriate anchorages can effectively suppress or delay the occurrence of the debonding failure, thus improving the strengthening efficiency and the utilization of the materials. The scholars at home and abroad have proposed different forms of anchoring measures, and their effects, durability, and construction complexity are different. The oblique U-jacket was proposed to suppress or mitigate the concrete cover debonding of RC beams. Four full-scale RC beams strengthened by FRP with or without end oblique U-jacket to identify the effect of the U-jacket on the suppression or mitigation of concrete cover debonding. The test results showed that the ultimate bearing capacity and ductility of the tested beams with externally bonded and near surface mounted reinforced concrete beams could be increased by 62.03% and 117.85%, 61.08% and 155.44%, respectively.
- reinforced concrete beams,
- flexural strengthening,
- concrete cover debonding,
- anchoraging,
- fiber-reinforced polymer composites

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References

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