Abstract

Carbon fibre reinforced polymer (CFRP) composite sheets and bars were used to strengthen reinforced concrete across a known plane to resist shear friction. The uncracked push-off specimens were either externally reinforced with CFRP sheets with a reinforcement ratio of 0.8% and 1.6% or internally with CFRP bars as additional shear reinforcement corresponding to 0.8% reinforcement ratio. Two ratios of internal steel reinforcement were considered representing the nominal stirrup reinforcement according to both historic (0.17%) and current design codes (0.26%). The effects of varying anchorage length of the CFRP on the shear friction capacity of the push-off specimens with externally bonded reinforcement (EBR) were studied through various strengthening schemes. Experimental results showed an increase in shear strength ranging from 23 – 84% compared to the unstrengthened control specimens. Tests with various wrapping schemes showed no evidence that additional shear friction capacity can be developed when beyond a sufficient anchorage length. However, specimens with short anchorage length failed prematurely due to the early debonding of the CFRP. The shear friction strength of the initially uncracked push- off specimens was determined using experimental results combining the shear friction contribution of the individual structural components, extending the currently accepted approach for internal steel reinforcement.
Original languageEnglish
Number of pages13
Publication statusPublished - Feb 2014
EventThe Fourth International fib Congress - Mumbai, India
Duration: 10 Feb 201414 Feb 2014

Conference

ConferenceThe Fourth International fib Congress
CountryIndia
CityMumbai
Period10/02/1414/02/14

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Reinforced concrete
Reinforcement
Mechanics
Carbon fibers
Friction
Polymers
Steel
Debonding
Shear strength
Composite materials

Keywords

  • reinforced concrete
  • strengthening
  • FRP
  • shear
  • anchorage
  • deep embedment

Cite this

Grusova, M., Ibell, T. J., Darby, A. P., Evernden, M., & Orr, J. J. (2014). Mechanics of failure in FRP strengthened reinforced concrete in shear. Paper presented at The Fourth International fib Congress, Mumbai, India.

Mechanics of failure in FRP strengthened reinforced concrete in shear. / Grusova, Monika; Ibell, T J; Darby, A P; Evernden, M; Orr, J J.

2014. Paper presented at The Fourth International fib Congress, Mumbai, India.

Research output: Contribution to conferencePaper

Grusova, M, Ibell, TJ, Darby, AP, Evernden, M & Orr, JJ 2014, 'Mechanics of failure in FRP strengthened reinforced concrete in shear' Paper presented at The Fourth International fib Congress, Mumbai, India, 10/02/14 - 14/02/14, .
Grusova M, Ibell TJ, Darby AP, Evernden M, Orr JJ. Mechanics of failure in FRP strengthened reinforced concrete in shear. 2014. Paper presented at The Fourth International fib Congress, Mumbai, India.
Grusova, Monika ; Ibell, T J ; Darby, A P ; Evernden, M ; Orr, J J. / Mechanics of failure in FRP strengthened reinforced concrete in shear. Paper presented at The Fourth International fib Congress, Mumbai, India.13 p.
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AU - Darby, A P

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N2 - Carbon fibre reinforced polymer (CFRP) composite sheets and bars were used to strengthen reinforced concrete across a known plane to resist shear friction. The uncracked push-off specimens were either externally reinforced with CFRP sheets with a reinforcement ratio of 0.8% and 1.6% or internally with CFRP bars as additional shear reinforcement corresponding to 0.8% reinforcement ratio. Two ratios of internal steel reinforcement were considered representing the nominal stirrup reinforcement according to both historic (0.17%) and current design codes (0.26%). The effects of varying anchorage length of the CFRP on the shear friction capacity of the push-off specimens with externally bonded reinforcement (EBR) were studied through various strengthening schemes. Experimental results showed an increase in shear strength ranging from 23 – 84% compared to the unstrengthened control specimens. Tests with various wrapping schemes showed no evidence that additional shear friction capacity can be developed when beyond a sufficient anchorage length. However, specimens with short anchorage length failed prematurely due to the early debonding of the CFRP. The shear friction strength of the initially uncracked push- off specimens was determined using experimental results combining the shear friction contribution of the individual structural components, extending the currently accepted approach for internal steel reinforcement.

AB - Carbon fibre reinforced polymer (CFRP) composite sheets and bars were used to strengthen reinforced concrete across a known plane to resist shear friction. The uncracked push-off specimens were either externally reinforced with CFRP sheets with a reinforcement ratio of 0.8% and 1.6% or internally with CFRP bars as additional shear reinforcement corresponding to 0.8% reinforcement ratio. Two ratios of internal steel reinforcement were considered representing the nominal stirrup reinforcement according to both historic (0.17%) and current design codes (0.26%). The effects of varying anchorage length of the CFRP on the shear friction capacity of the push-off specimens with externally bonded reinforcement (EBR) were studied through various strengthening schemes. Experimental results showed an increase in shear strength ranging from 23 – 84% compared to the unstrengthened control specimens. Tests with various wrapping schemes showed no evidence that additional shear friction capacity can be developed when beyond a sufficient anchorage length. However, specimens with short anchorage length failed prematurely due to the early debonding of the CFRP. The shear friction strength of the initially uncracked push- off specimens was determined using experimental results combining the shear friction contribution of the individual structural components, extending the currently accepted approach for internal steel reinforcement.

KW - reinforced concrete

KW - strengthening

KW - FRP

KW - shear

KW - anchorage

KW - deep embedment

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