Issue 59

M. Madqour et al, Frattura ed Integrità Strutturale, 59 (2022) 62-77; DOI: 10.3221/IGF-ESIS.59.05

Finite element modeling of flexural behavior of reinforced concrete beams externally strengthened with CFRP sheets

Mahmoud Madqour, Hilal Hassan, Khaled Fawzy Structural department, Zagazig University, Egypt Madqour42@gmail.com https://orcid.org/0000-0002-0994-2884 hilalcivil@yahoo.com https://orcid.org/0000-0001-5486-5497 khaled_lashen1@yahoo.com https://orcid.org/0000-0003-2275-4025

A BSTRACT . In this research, the finite element method is used to develop a numerical model to analyse the effect of the external strengthening of reinforced concrete beams by using carbon Fiber Reinforced Polymer (CFRP) sheets. A finite element model has been developed to investigate the behavior of RC beams strengthened with CFRP sheets by testing nineteen externally simple R.C. beams, tested under a four-point load setup until failure. Various CFRP systems were used to strengthen the specimens. The numerical results using the (ANSYS workbench v.19.1) were calibrated and validated with the experimental results. The research results indicate a significant improvement in the structural behavior of the specimens strengthened using CFRP sheet systems. Then the validated model investigated the effect of the width of CFRP sheets, no of layers, and CFRP size on the behavior of strengthened R.C. beams. Results of this numerical investigation show the effectiveness of increase CFRP width to improve the flexural capacity of R.C. beams. An increase in the flexural capacity up to 100 % compared to the control beam. K EYWORDS . Strengthening; Carbon fiber reinforced polymer; Deflection; ANSYS; Ultimate strength.

Citation . Mahmoud madqour, Hilal Hassan., Khalid Fawzi., Finite element modeling of flexural behavior of reinforced concrete beams externally strengthened with CFRP sheets, Frattura ed Integrità Strutturale, 59 (2022) 62-77.

Received : 30.08.2021 Accepted : 30.09.2021 Published : 01.01.2022

Copyright : © 2022 This is an open access article under the terms of the CC-BY 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

I NTRODUCTION

ver the past decades, (FRP) has been commonly used to repair and rehabilitate civil structures, showing signs of aging degradation and distress. (CFRP) is a brittle material that typically fails at a lower load level (i.e., horizontal crack propagation or debonding). As a result, the ultimate capacity of the reinforced concrete structural elements is challenging to achieve., Kang et al.,[1]. In the past, various researchers conducted studies on reinforced concrete beams with CFRP retrofitted in flexure, and the failure patterns were observed [2-4]. Recent research has focused on the impact of geometric factors such as length and the FRP–concrete width ratio. It has been shown that the ultimate stress for debonding increases with bonded length up to a critical bond length. Although numerous researchers have presented results demonstrating the influence of FRP laminate width on ultimate load, these results are frequently inconsistent [5–7]. The available results in the literature are frequently contradictory. While some O

62