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Shear strengthening of RC 3D exterior beam-column joints with CFRP sheets an experimental and numerical study

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Abstract

The present article presents the numerical and experimental investigations carried out on CFRP shear strengthening of full-scale RC 3D exterior beam-column joints lacking transverse rebars at their joint core and subjected to a combination of gravity and reversed lateral loads. For this purpose, one non-strengthened beam-column joint used as control and two strengthened with given patterns of single-layer and three-layer CFRP sheets were prepared. In the next step, cyclic load–displacement, failure mode, ductility, energy dissipation, energy absorption, and secant stiffness curves were derived for all the specimens and compared. The experimental specimens were then modeled in ABAQUS using the finite-element method and subjected to non-linear analysis; the analytical results thus obtained were finally verified against the experimental ones. In another phase of the study, changes were made in such parameters as beam longitudinal tensile reinforcement ratio, concrete specific compressive strength, and compressive axial force applied to the column to create eight simulated numerical specimens, which were then subjected to non-linear analysis and compared. The results indicate that the strengthened specimens not only prevented shear diagonal failure at the rear of the column-transverse beam joint but also increased lateral load capacity by 11 to 15%, energy absorption by 10 to 20%, and energy dissipation by 2.2 times when compared with the same parameters of the control. Moreover, it was observed that increasing concrete specific compressive strength from 12 to 30 MPa led to an average increase of 31% in lateral load capacity and one of 46% in absorbed energy, while a twofold increase in applied axial force led to an average reduction of 11% in lateral load capacity.

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All the data, models, and codes generated or used in the study appear in the submitted article.

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Acknowledgements

The authors would like to acknowledge the Structural Engineering Department of the Road, Housing, and Urban Development Research Center (BHRC) for their assistance in conducting the tests required.

Funding

All the tests were carried out in the lab of the Structuural Engineering Department of the Road, Housing & Urban Development Research Center (BHRC)/IRAN.

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Authors and Affiliations

  1. South Tehran Branch, Islamic Azad University, Tehran, Iran

    Kianosh Farhang

  2. Structural Engineering Department, Road, Housing, and Urban Development Research Center, Tehran, Iran

    Farhang Farahbod

  3. Department of Civil Engineering, Research Center for Modeling and Optimization in Science and Engineering, South Tehran Branch of Islamic Azad University, Tehran, Iran

    Maryam Firoozi Nezamabadi

  4. International Institute of Earthquake Engineering and Seismology, Tehran, Iran

    Babak Mansouri

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  1. Kianosh Farhang
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Contributions

Farhang Farahbod and Kianosh Farhang Wrote the main manuscript text.All authors reviewed the manuscript.

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Correspondence to Farhang Farahbod.

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The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper. The authors did not receive support from any organization for the submitted work. No funding was received to assist with the preparation of this manuscript. No funding was received for conducting this study. No funds, grants, or other support was received. The authors have no relevant financial or non-financial interests to disclose. The authors have no competing interests to declare that are relevant to the content of this article. All authors certify that they have no affiliations with or involvement in any organization or entity with any financial interest or non-financial interest in the subject matter or materials discussed in this manuscript. The authors have no financial or proprietary interests in any material discussed in this article.

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Farhang, K., Farahbod, F., Nezamabadi, M.F. et al. Shear strengthening of RC 3D exterior beam-column joints with CFRP sheets an experimental and numerical study. Asian J Civ Eng 24, 1599–1619 (2023). https://doi.org/10.1007/s42107-023-00591-8

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