Experimental investigation of corrosion-damaged RC beams strengthened in flexure with FRP grid-reinforced ECC matrix composites

Zheng, Aohan; Liu, Zhenzhen; Li, Faping; Li, Shan

doi:10.1016/j.engstruct.2021.112779

Cited by 43 publications

(15 citation statements)

References 33 publications

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“…CFRP grids are also currently used for repairing or strengthening RC structures (Guo et al, 2021;Yoshitake et al, 2020;Cabral-Fonseca et al, 2018;Zheng et al, 2021Zheng et al, , 2022. Guo et al (Guo et al, 2021) studied the flexural behavior of RC beams strengthened with CFRP grids, and the shear strengthening effects were obvious, but the beam with two-layer FRP grids did not perform better due to premature debonding.…”

Section: Introductionmentioning

confidence: 99%

Long-term shear performance of concrete beam with carbon fiber-reinforced composite grid stirrups under sustained loadings and seawater immersion

Fu,

Lu,

et al. 2023

Advances in Structural Engineering

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Using carbon fiber-reinforced composite (CFRP) grid stirrups to replace traditional steel stirrups in reinforced concrete (RC) beams can effectively improve the corrosion resistance of structures in marine environments. In this study, the durability of RC beams with CFRP grid stirrups under the coupled effects of sustained loads and immersion in seawater was studied. The sustained loads were set at 24% and 48% of the ultimate bearing capacity of the RC beam, and the specimens were immersed in artificial seawater at room temperature for 90 days, 180 days, and 360 days, respectively. The crack load and shear capacity of the beam were measured at the scheduled time. The initial stiffness of the beam decreased as the immersion time increased, and the higher the sustained load was, the lower the initial stiffness of the conditioned beam. The contribution of the CFRP grid stirrup to the shear load capacity after the cracking load was reached was more significant than that before. The effects of the 48% sustained load on the ultimate tensile strain of the CFRP stirrup were more significant than those for the 24% sustained load. Both immersion and sustained loading improved the cracking load and shear capacity of the beam, and the contribution of sustained loading to the shear capacity decreased as the immersion time and the sustained load level increased. Equations were proposed for predicting the shear strength of RC beams with CFRP grid stirrups under sustained loading and seawater immersion.

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Section: Introductionmentioning

confidence: 99%

Long-term shear performance of concrete beam with carbon fiber-reinforced composite grid stirrups under sustained loadings and seawater immersion

Fu,

Lu,

et al. 2023

Advances in Structural Engineering

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“…Yang et al [23] conducted an experimental study on the flexural performance of concrete beams strengthened with CFRP grids-reinforced ECC layer. Zheng et al [24] proposed to use the FRP grid-reinforced ECC matrix composite to flexural strengthen the corrosion-damaged RC beams. Zheng et al [25] and Guo et al [26] investigated the shear strengthening effect of the FRP grid/ECC hybrid system on the RC beam.…”

Section: Introductionmentioning

confidence: 99%

I-shaped ECC/UHPC composite beams reinforced with steel bars and BFRP sheets

Dong¹,

Ji²,

Liu³

et al. 2022

Sustain. Struct.

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This paper proposes a new type of small-sized I-shaped engineered cementitious composite (ECC)/ ultra-high performance concrete (UHPC) composite beam which has the potential to be suitable for corrosive environments. The lower tensile part of the beam was made of ECC material (2/3 of the height), and the top compressive part was made of UHPC material (1/3 of the height). Inner embedded steel bars and surface-bonded basalt fiber reinforced polymer (BFRP) sheets were adopted as the reinforcing materials in combination. A total of nine I-shaped beams were designed and tested under four-point bending test. The influence of parameters such as the ratio of the embedded tensile steel bars, the top UHPC flange, and the surface bonded tensile BFRP sheet on the behavior of the beams was investigated. The results showed that the I-shaped ECC/UHPC composite beams have excellent comprehensive performance, and thanks to the ultra-high durability of the component materials, they have ultra-high durability that ordinary I-steel beams do not have and thus have broad application prospects in corrosive environments. The shear resistance capacity of the thin-walled ECC web needs to be further improved, and UHPC is recommended for the web in the follow-up study.

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“…Therefore, the ability of a cementbased bridge deck to resist bending deformation or bending tensile stress is extremely important. Engineered Cementitious Composites (ECC) are a new type of polyvinyl alcohol, fiber-reinforced, cementitious composite with high ductility, high toughness and good crack control performance [7][8][9][10]. It was originally proposed by Professor Victor.…”

Section: Introductionmentioning

confidence: 99%

Study on Shear Performance of Short Bolt Interface in ECC–Steel Bridge Deck Composite Structure

Zeng

Wang

et al. 2022

Applied Sciences

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Aiming at the problem that orthotropic steel bridge deck and bridge deck pavement are prone to fatigue damage, Engineered Cementitious Composites (ECC) bridge deck pavement is used to replace concrete or asphalt in flexible bridge deck pavement. In order to deeply explore the shear resistance of the short stud interface in the ECC–steel composite structure and provide theoretical support for the practical application of the project, 16 static push-out tests were completed. The effects of stud diameter, height and arrangement spacing on the shear capacity of the medium and short ECC studs were studied. The failure modes, load–slip curves, load–strain curves and interface gap width curves of the components were analyzed. The test results showed that the shear force of the medium and short ECC bolts mainly produces two failure modes, bolt shearing and bolt root weld shearing, while the ECC plate has a local crushing area at the interface bolt root position, and no large cracks occur in other areas. The shear capacity of short bolts is significantly affected by the diameter of the bolts, but is less affected by the height and spacing of the bolts, and increases with the diameter of the short bolts. The length of the stud has an important influence on the stress on the surface of the ECC board. The longer the stud, the greater the tensile stress on the ECC surface. The shorter the peg, the more prone to eccentric compression the ECC plate is, and the longer the peg, the more prone to axial compression it is.

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Experimental investigation of corrosion-damaged RC beams strengthened in flexure with FRP grid-reinforced ECC matrix composites

Cited by 43 publications

References 33 publications

Long-term shear performance of concrete beam with carbon fiber-reinforced composite grid stirrups under sustained loadings and seawater immersion

Long-term shear performance of concrete beam with carbon fiber-reinforced composite grid stirrups under sustained loadings and seawater immersion

I-shaped ECC/UHPC composite beams reinforced with steel bars and BFRP sheets

Study on Shear Performance of Short Bolt Interface in ECC–Steel Bridge Deck Composite Structure

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