Experiment on crack resistance of prestressed CFRP tendons-steelreinforced concrete members under eccentric tension

ZHANG Peng; GUI Jinyang; DENG Yu; SHEN Minhe; SUN Fei; ZHAO Xiaodong

doi:10.13801/j.cnki.fhclxb.20200710.001

Volume 38 Issue 3

Mar. 2021

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ZHANG Peng, GUI Jinyang, DENG Yu, et al. Experiment on crack resistance of prestressed CFRP tendons-steelreinforced concrete members under eccentric tension[J]. Acta Materiae Compositae Sinica, 2021, 38(3): 920-931. doi: 10.13801/j.cnki.fhclxb.20200710.001

Citation:

ZHANG Peng, GUI Jinyang, DENG Yu, et al. Experiment on crack resistance of prestressed CFRP tendons-steelreinforced concrete members under eccentric tension[J]. Acta Materiae Compositae Sinica, 2021, 38(3): 920-931. doi: 10.13801/j.cnki.fhclxb.20200710.001

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Experiment on crack resistance of prestressed CFRP tendons-steelreinforced concrete members under eccentric tension

doi: 10.13801/j.cnki.fhclxb.20200710.001

College of Civil Engineering and Architecture, Guangxi University of Science and Technology, Liuzhou 545006, China

Received Date: 2020-05-06
Accepted Date: 2020-06-28

Available Online: 2020-07-10

Publish Date: 2021-03-15

Abstract

Abstract

In our country, there are many eccentric tension members, such as steel reinforced concrete truss transfer layer straining beam, low-rise building corner column. For these members, large-scale cracks easily appear during normal use stage. Aiming at these problems, this paper took the light, high-strength and anti-corrosion carbon fiber reinforced polymer composite (CFRP) tendons as the prestressed reinforcement, the prestressed CFRP-steel reinforced concrete structure system was designed by combining CFRP tendons with prestressed steel reinforced concrete, which can effectively restrain the crack. And on this basis, a systematic study on the crack resistance under eccentric tension was carried out. A total of eleven members were designed and fabricated with the prestress level, eccentricity, longitudinal reinforcement diameter and profile flange thickness as the main parameters, and eccentric loading was achieved through the self-developed tension-compression conversion truss system. The results indicate that the crack resistance of the prestressed CFRP tendons-steel/concrete members is greatly strengthened. Compared with the ordinary eccentric members, the cracking loads of the large tension members with prestressed CFRP tendons are increased by 64.8%–102.3%, the cracking loads of the small tension members with prestressed CFRP tendons are increased by 61.7%–117%. The crack resistance of the member is positively related to the prestress level, longitudinal reinforcement diameter and steel flange thickness, and negatively related to the eccentricity. With reference to the combined structural design specification, three positions of the neutral axis of the prestressed CFRP tendons-steel reinforced concrete members during the cracking stage are proposed, and the calculation formula of cracking load is derived. Compared with the test value, the agreement is perfect, which can provide a reference for the application of other composites in the prestressed eccentric tension system.
- prestressed,
- carbon fiber reinforced ploymer (CFRP) tendons,
- steel reinforced concrete members,
- crack resistance performance,
- calculation of cracking load
Long Abstrsct
Innovation Points

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References(23)

References

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