Abstract
Conventional reinforced concrete arches are susceptible to corrosion in underground environments, leading to reduced durability. This study proposes concrete-filled FRP (Fiber-reinforced polymer) wound tubular arches with internal FRP bars to achieve excellent corrosion resistance. Eighteen concrete-filled FRP tubular arches were tested under mid-span concentrated loading, and the effects of FRP tube wall thickness and FRP reinforcement configuration were investigated. The experimental results demonstrate that increasing the wall thickness of the FRP tube significantly enhances the ultimate load-bearing capacity, with a maximum increase of 104.7% observed under mid-span loading. The incorporation of FRP reinforcement also resulted in 236.3%~279% increase of ultimate capacity and 111.11%-119.67% increase of displacement ductility ratio. A simplified theoretical model for predicting the ultimate load of concrete-filled FRP tubular arches with internal FRP bars was proposed, achieving a relative error within 10%. The proposed concrete-filled FRP tubular arch demonstrates considerable potential for application in underground engineering.
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The data provided in the manuscript are comprehensive and available upon request to the corresponding author.
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Funding
The work was fully supported by the National Key Research and Development Program of China (Grant No. 2023YFB3711600) and the National Natural Science Foundation of China (Grant No. 52208252).
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Benben Li: Writing- original draft, Conceptualization. Zhenyuan Yang: Formal analysis, Data curation. Yujun Qi: Funding acquisition, Writing- review & editing, Supervision. Zhenglong Zhou: Supervision. Guowei Wang: Formal analysis, Data curation.
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Li, B., Yang, Z., Qi, Y. et al. Bending behavior of concrete-filled FRP wound tubular arches with internal FRP bars. Sci Rep (2026). https://doi.org/10.1038/s41598-026-38886-w
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DOI: https://doi.org/10.1038/s41598-026-38886-w
