NONLINEAR FINITE-ELEMENT ANALYSIS FOR RC BEAMS STRENGTHENED WITH FABRIC-REINFORCED CEMENTITIOUS MATRIX

Nagah, Mohamed; Arafa, Ahmed; Drar, Ahmed Attia M.; Hassanean, Yehia. A.

doi:10.21608/jesaun.2020.109362

NONLINEAR FINITE-ELEMENT ANALYSIS FOR RC BEAMS STRENGTHENED WITH FABRIC-REINFORCED CEMENTITIOUS MATRIX

Document Type : Research Paper

Authors

¹ Civil Department, Faculty of Engineering, Sohag University, Egypt

² Civil Department, Faculty of Engineering, Sohag University, Egypt.

³ Civil Engineering Department, Faculty of Engineering, Sohag University, Egypt

⁴ Civil Department, Faculty of Engineering, Assiut University, Egypt.

10.21608/jesaun.2020.109362

Abstract

Because of the shortcomings of the externally bonded system that mainly consists of epoxy and FRP sheets, the fabric-reinforced cementitious matrix, (FRCM) represents a viable solution in the strengthening of reinforced concrete beams. The FRCM layers consist of fabric mesh embedded in an inorganic stabilized cementitious mortar. Many experimental studies examined the impact of strengthening of RC beams with the FRCM layers, but the numerical investigations are limited. This study is therefore aimed at introducing a numerical study investigating the behavior of RC beams reinforced with FRCM layer. The main goal of this paper is to verify the FEM results with the experimental results that are available in the previous study [1], and to provide a parametric study. The investigated beams in this paper are 150 mm × 250 mm× 3000 mm with two reinforcement ratios. One, two, and three-layers of PBO, (p-Phenylene Benzobis Oxazole) FRCM were investigated as strengthening of the simulated beams were strengthened with. The numerical validation included load-deflection curve, load –strain of both concrete and PBO- FRCM, strain distribution, cracks series and failure mode. The built model gave an accurately prediction of the attitude of the investigated beams. The results also indicated that the rise in the reinforcement ratio or the amount of FRCM layers contributed to improving behavior under both ultimate and serviceability limit states.

Keywords

Main Subjects

Civil Engineering: structural, Geotechnical, reinforced concrete and steel structures, Surveying, Road and traffic engineering, water resources, Irrigation structures, Environmental and sanitary engineering, Hydraulic, Railway, construction Management.

References

[1] Ombres, L. (2011). Flexural analysis of reinforced concrete beams strengthened with a cement based high strength composite material. Composite Structures, 94(1), 143-155.

[2] Jabr, A., et al. (2017). Effect of the fiber type and axial stiffness of FRCM on the flexural strengthening of RC beams. Fibers, 5(1).

[3] Elghazy, M., et al. (2017). Effect of corrosion damage on the flexural performance of RC beams strengthened with FRCM composites. Composite Structures, (180), 994-1006.

[4] Aljazaeri, Z. R., et al. (2019). A novel and effective anchorage system for enhancing the flexural capacity of RC beams strengthened with FRCM composites. Composite Structures, 210, 20-28.

[5] Abaqus. Version 6.14. Dassault Systemes: 3DS Paris Campus; 2014.

[6] Michał, S., & Andrzej, W. (2015). Calibration of the CDP model parameters in Abaqus. The 2015 Wourld Congress on Advances in Structural Engineering and Mechanics (ASEM15)

[7] Carreira, D. J., & Chu, K. H. (1985). Stress-strain relationship for plain concrete in compression. Journal Proceedings (Vol. 82, No. 6, pp. 797-804)

[8] Salve, A. K., & Jalwadi, S. N. (2015). Implementation of cohesive zone in ABAQUS to investigate fracture problems. Proceedings of the National Conference for Engineering Postgraduates RIT, NConPG–15, (pp. 60-66)

[9] Ombres, L. (2012). Debonding analysis of reinforced concrete beams strengthened with fibre reinforced cementitious mortar. Engineering Fracture Mechanics, 81, 94-109.

[10] Ombres, L. (2015). Analysis of the bond between fabric reinforced cementitious mortar (FRCM) strengthening systems and concrete. Composites Part B: Engineering, 69, 418-426.

[11] Younis, A., & Ebead, U. (2018). Bond characteristics of different FRCM systems. Construction and Building Materials, 175, 610-620.

[12] Toutanji, H., et al. (2006). Flexural behavior of reinforced concrete beams externally strengthened with CFRP sheets bonded with an inorganic matrix. Engineering structures, 28(4), 557-566

[13] Hawileh, R. A., et al. (2015). Temperature effect on the mechanical properties of carbon, glass, and carbon–glass FRP laminates. Construction and Building Materials, 75, 342-348.

[14] Silva, M. A., & Biscaia, H. (2008). Degradation of bond between FRP and RC beams. Composite structures, 85(2), 164-174.‏