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Optimal Design Method and Experiment for Improved Wedge-Type Anchors of Large-Diameter Smooth CFRP Tendons

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Abstract

CFRP tendons with smooth surface conditions have good applicability in prestressed structures and structural reinforcement because of their high load-carrying capacity and simple production. However, they are difficult to anchor reliably. This paper developed an improved wedge-type anchor for large-diameter CFRP tendons. The mechanical behavior analysis theories of wedge-type anchors, including the load-carrying capacity evaluation model, were presented. The friction behavior of the sand-coated sleeve-tendon, which was used to evaluate the load-carrying capacity of the anchor, was experimentally investigated. The influence laws of the main wedge-type anchor parameters on the mechanical behavior of the anchor were obtained through theoretical analysis. Then, the optimal anchorage system design method was proposed, and the optimal anchor designs for smooth CFRP tendons with various diameters were presented. The anchor performance was experimentally evaluated, and the sleeve-tendon interface friction coefficient was approximately doubled after optimization, reaching 0.475. The wedge and barrel cone angles, preset load and anchor length had significant effects on the mechanical behavior of the anchor. The optimal design anchors for smooth CFRP tendons with diameters of 10 mm and 12.7 mm and spiral-wrapped CFRP tendons with diameters of 10 mm reached failure loads up to 93.8, 91.2 and 95.4% of the tensile capacity of the tendons, respectively.

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Data Availability Statement

The datasets generated and/or analyzed during the current study are available from the corresponding author upon reasonable request.

Code Availability

Not applicable.

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Acknowledgements

This research was sponsored by the National Natural Science Foundation of China (grant No. 52078256 and 51208269), Highway and Transportation Science and Technology Plan of Zhejiang Province (grant No. 2020H02), the Fund of National Engineering and Research Center for Mountainous Highways (grant No. GSGZJ-2019-04), the Science and technology project of Ningbo Transportation Committee (grant No. 202016), and the K.C. Wong Magna Fund at Ningbo University.

Funding

This research was sponsored by the National Natural Science Foundation of China (grant No. 52078256 and 51208269), Highway and Transportation Science and Technology Plan of Zhejiang Province (grant No. 2020H02), the Fund of National Engineering and Research Center for Mountainous Highways (grant No. GSGZJ-2019–04), the Science and technology project of Ningbo Transportation Committee (grant No. 202016), and the K.C. Wong Magna Fund at Ningbo University.

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Authors and Affiliations

  1. Department of Civil Engineering, School of Civil and Environmental Engineering, Ningbo University, Ningbo, 315211, China

    Ping Zhuge, Guocheng Tao, Zhiyu Jie, Yong Ding & Bing Wang

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  1. Ping Zhuge
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  2. Guocheng Tao
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  3. Zhiyu Jie
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  4. Yong Ding
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  5. Bing Wang
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All authors contributed to the study conception and design. All authors read and approved the final manuscript.

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Correspondence to Yong Ding.

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Zhuge, P., Tao, G., Jie, Z. et al. Optimal Design Method and Experiment for Improved Wedge-Type Anchors of Large-Diameter Smooth CFRP Tendons. Appl Compos Mater 28, 1997–2019 (2021). https://doi.org/10.1007/s10443-021-09945-4

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