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Axial Compression Performance Test and Bearing Capacity Calculation of RC Square Column Strengthened by FRP Textile Grid-reinforced ECC

  • Structural Engineering
  • Published:
KSCE Journal of Civil Engineering Aims and scope

Abstract

In order to investigate the strengthening effect of FRP textile grid reinforced ECC composite (abbreviated: TRE) restrained RC columns, this study conducted experimental and theoretical studies on the axial compression performance of TRE strengthened RC square columns with RC square columns as the research object. The effects of the chamfer radius of the original column, the type of FRP grid and the number of layers of the grid on the axial compression performance of the TRE-strengthened RC square column were considered. The axial compression tests showed that the strengthened layer exhibited excellent crack control, the reinforced column cracked as a whole without breaking when it was damaged, and the strengthened layer adhered well to the core concrete. Compared with unstrengthened specimens, the compressive strength, ductility and deformation capacity of the RC square column under TRE restraint were significantly higher. The increase of chamfer radius of square column makes the TRE restraint effect better. Increasing the number of grid layers can significantly improve the ultimate bearing capacity and ductility of the strengthened specimens. The effects of TRE strengthening methods with different FRP grids differed, with the same number of grid layers, the ultimate bearing capacity of the specimens strengthened with CFRP grid reinforced ECC was higher, and the cracking load of the specimens strengthened with BFRP grid reinforced ECC was higher. A model for calculating the ultimate bearing capacity of the TRE-constrained RC square column was established, and the validity of the model was verified by comparing the results of this test.

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Acknowledgments

This research was funded by the Guangxi Science and Technology Major Special Project (CN) (grant number, Guike AA22068066), and the Liuzhou Science and Technology Major Special Project (CN) (grant number, 2022AAC0102), and Innovation Project of Guangxi University of Science and Technology Graduate Education (grant number, GKYC202330).

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Authors and Affiliations

  1. School of Civil Engineering and Architecture, Guangxi University of Science and Technology, Liuzhou, Guangxi, 545006, China

    Langni Deng, Taisheng Li, Shijin Lai, Ling Liao & Hua Li

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  1. Langni Deng
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  2. Taisheng Li
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  3. Shijin Lai
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  4. Ling Liao
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  5. Hua Li
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Correspondence to Taisheng Li.

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Deng, L., Li, T., Lai, S. et al. Axial Compression Performance Test and Bearing Capacity Calculation of RC Square Column Strengthened by FRP Textile Grid-reinforced ECC. KSCE J Civ Eng 27, 5203–5215 (2023). https://doi.org/10.1007/s12205-023-2210-6

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  • DOI: https://doi.org/10.1007/s12205-023-2210-6

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