Research on strengthening stone arch bridge with CFRP rebars

Zhang, Kexin; Li, Dachao; Shen, Xiao‐Jun; Hou, Wenyu; Li, Yanfeng; Xue, Xingwei

doi:10.1108/ijbpa-07-2021-0097

IJBPA

2021

DOI: 10.1108/ijbpa-07-2021-0097

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Research on strengthening stone arch bridge with CFRP rebars

Kexin Zhang

Dachao Li

Xiao‐Jun Shen

et al.

Abstract: PurposeThis paper aims to describe carbon fiber reinforced plastics (CFRP) bars as a way to strengthen a 40-year-old stone arch bridge. To investigate effectiveness of the strengthening method, fielding-load tests were carried out before and after strengthening.Design/methodology/approachHigh-strength CFRP bars with minor radius, high tensile strain and good corrosion resistance were used in this reinforcement. The construction process for strengthening with CFRP bars – including CFRP bars cutting, crack grout… Show more

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Cited by 2 publications

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The behavior of strengthened RC beams under pure torsion using NSM-CFRP rope

Ashteyat,

Obaidat,

Obeidat

et al. 2024

IJBPA

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PurposeThe paper aims to introduces an experimental work to investigate the torsional behavior of reinforced concrete (RC) beams strengthened by near-surface mounted (NSM) carbon fiber-reinforced polymer (CFRP) ropes.Design/methodology/approachIn this research, nine rectangular RC beams of 250 mm × 300 mm cross-section and 1,600 mm in length were constructed and tested considering the studied parameters. These parameters include the length of the CFRP rope, the orientation of the CFRP rope, the arrangement of longitudinal and the scheme of NSM-CFRP ropes.FindingsIn comparison to control specimens, the results demonstrate a considerable improvement in the torsional response of RC beams strengthened with the CFRP rope. Additionally, specimens strengthened with 90° vertical ropes increase torsional moment capacity more efficiently than specimens strengthened with 45° inclined ropes since the stress concentration leads to premature debonding of the CFRP rope. Whereas RC beams' ability to withstand torsional moments is reduced as the distance between reinforcing CFRP ropes is increased. According to test results, adding CFRP ropes to RC beams' bottoms had a slightly positive impact on torsional response.Originality/valueThis paper fulfills an identified need to study how the using of the CFRP rope is effective in strengthening RC beam subjected to torsion moment.

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The behavior of strengthened RC beams under pure torsion using NSM-CFRP rope

Ashteyat,

Obaidat,

Obeidat

et al. 2024

IJBPA

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Flexural bearing capacity of reinforced concrete beams reinforced with carbon fiber reinforced plastics strips and ultra-high performance concrete layers

Liu

Wan

2022

IJBPA

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PurposeTo make full use of the tensile strength of near surface mounting (NSM) pasted carbon fiber reinforced plastics (CFRP) strips and further increase the flexural bearing capacity and flexibility of reinforced concrete (RC) beams, a new composite reinforcement method using ultra-high performance concrete (UHPC) layer in the compression zone of RC beams is submitted based on embedding CFRP strips in the tension zone of RC beams. This paper aims to discuss the aforementioned points.Design/methodology/approachThe experimental beam was simulated by ABAQUS, and compared with the experimental results, the validity of the finite element model was verified. On this basis, the reinforced RC beam is used as the control beam, and parameters such as the CFRP strip number, UHPC layer thickness, steel bar ratio and concrete strength are studied through the verified model. In addition, the numerical calculation results of yield strength, ultimate strength, failure deflection and flexibility are also given.FindingsThe flexural bearing capacity of RC beams supported by the new method is 132.3% higher than that of unreinforced beams, and 7.8% higher than that of RC beams supported only with CFRP strips. The deflection flexibility coefficient of the new reinforced RC beam is 8.06, which is higher than that of the unreinforced beam and the reinforced concrete beam with only CFRP strips embedded in the tension zone.Originality/valueIn this paper, a new reinforcement method is submitted, and the effects of various parameters on the ultimate bearing capacity and flexibility of reinforced RC beams are analyzed by the finite element numerical simulation. Finally, the effectiveness of the new method is verified by the analytical formula.

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Research on strengthening stone arch bridge with CFRP rebars

Cited by 2 publications

References 9 publications

The behavior of strengthened RC beams under pure torsion using NSM-CFRP rope

The behavior of strengthened RC beams under pure torsion using NSM-CFRP rope

Flexural bearing capacity of reinforced concrete beams reinforced with carbon fiber reinforced plastics strips and ultra-high performance concrete layers

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