Experimental and numerical studies on the behavior of RC exterior beam–column joints strengthened with fiber sheets under cyclic loads

Qais Al-Gabri; Ehab lotfy; Khaled Ragab; Manar Ahmed; Abdel-Rahman  Naguib

doi:10.56748/ejse.24646

Authors

Qais Al-Gabri Thamar University https://orcid.org/0009-0006-8439-6736
Ehab lotfy Suez Canal University https://orcid.org/0000-0002-5719-1800
Khaled Ragab Housing and Building National Research Center
Manar Ahmed Suez Canal University
Abdel-Rahman Naguib Suez Canal University https://orcid.org/0009-0004-3909-5964

DOI:

https://doi.org/10.56748/ejse.24646

Keywords:

Hybrid fiber reinforced polymer (HFRP), Beam–column joint, Cyclic loading, Strengthening, Ductility, Numerical model

Abstract

Joints are important regions in reinforced concrete (RC) buildings, which are most susceptible to seismic loads. Many retrofitting works utilizing fiber reinforced polymers (FRP) composites are in all developed countries. In this study, there was a change in the strengthening of joints using carbon fiber (CFRP), glass fiber (GFRP), and carbon with glass ( hybrid fiber ). A total of seven specimens were designed and tested by cyclic loading (controlled displacement- load of frequency of 0.05 Hz). The details of the specimens are as follows: one unstrengthened reference specimen, six specimens for wrapping with fiber (two are carbon strengthened , two are glass strengthened, and the other two for HFRP wrapping). The results of the testing were compared with those of the reference specimen and strengthened specimens. The behavior of the strengthening joints was studied by the following parameters: first and ultimate load cracking, energy dissipation, ductility, also ultimate stiffness. Based on the results of the test, the hybrid combination was more effective in improving beam-column joints at a highly competitive cost. Furthermore, a comparison of the experimental test and the numerical model results shows that the proposed model is almost identical.

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Author Biographies

Ehab lotfy, Suez Canal University

Professor, Reinforced Concrete, Dean of Faculty Engineering, Civil Engineering Department, Faculty of Engineering, University of Suez Canal, Egypt.

Khaled Ragab, Housing and Building National Research Center

Professor, Reinforced Concrete Research Institute, Housing and Building National Research Center, Egypt

Manar Ahmed, Suez Canal University

Assistant professor, Civil Engineering Department-Faculty of Engineering- Suez Canal University, Egypt.

Abdel-Rahman Naguib, Suez Canal University

Lecturer, Civil Engineering Department, Faculty of Engineering, Suez Canal University, Egypt.

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