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Numerical investigation of various techniques for strengthening the external RC frame connection

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Abstract

This research presents a theoretical investigation into strengthening the external RC frame connection. A connection is a critical point in the structure due to the combination of cracks and the greatest shear–flexure stress, thereby leading to failure. This study was conducted to investigate the effectiveness of strengthening techniques for improving the RC frame connection and avoiding or delaying failure. FEA (ABAQUS) was employed to assess the influence of various parameters on connection behavior, including the number of GFRP–CFRP layers, the variable thickness of steel plates, and ferro-cement with different diameters of expanded wire mesh. Results were analyzed and contrasted against previous research findings. The results highlighted that utilizing a single layer of CFRP provides greater connection strength than GFRP. Furthermore, the optimized thickness of steel plate in this case is 6 mm. Additionally, ferro-cement with 1 mm thick wire mesh improves resistance by 41%. Moreover, through the utilization of a single layer of CFRP, two layers of GFRP, and a 6 mm-thick steel plate, stresses and failure are transferred from the connection to the beam, resulting in the avoidance of catastrophic failure. Despite the fact that ferro-cement is less expensive, the study recommended utilizing ferro-cement laminate with expanded wire mesh as it enhances ductility and resistance.

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The authors declare that no funds, grants, or other support was received during the preparation of this manuscript.

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Authors and Affiliations

  1. Civil Engineering Department, Faculty of Engineering, Minia University, Minia, Egypt

    A. E. Y. Abou Elezz & R. A. S. Mohamed

  2. Faculty of Engineering, Minia University, Minia, Egypt

    R. M. M. Abd Elhameed

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  1. A. E. Y. Abou Elezz
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  2. R. A. S. Mohamed
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  3. R. M. M. Abd Elhameed
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Contributions

Dr. Rabie supervised the research, and Dr. Alaa supervised and set the strategy for the work. Ph.D student, Rana did the research, simulated the RC frame connections model on the program, analyzed the results, and wrote the research.

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Correspondence to R. M. M. Abd Elhameed.

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Abou Elezz, A.E.Y., Mohamed, R.A.S. & Abd Elhameed, R.M.M. Numerical investigation of various techniques for strengthening the external RC frame connection. Asian J Civ Eng 25, 97–113 (2024). https://doi.org/10.1007/s42107-023-00759-2

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