NUMERICAL INVESTIGATION OF FRP CONFINED RC SQUARE AND CIRCULAR COLUMNS UNDER CONCENTRIC COMPRESSION LOAD
Numerical Investigation of FRP Confined RC Columns Under Compressive Load
DOI:
https://doi.org/10.55766/sujst-2024-02-e03172Abstract
In this study, the behavior of square and circular reinforced concrete (RC) columns confined with fiber reinforced polymer (FRP) composites were compared using the finite element model (FEM) under axial compressive load. The different parameters are considered as the type of FRP confinement such as carbon and glass, grade of concrete, and aspect ratios of the columns. The verified model was used to study the different parameters to investigate the different geometric and materials properties on the axial capacity of the columns. The results revealed a significant increase in the strength and ductility of both the square and circular columns due to FRP confinement. The carbon FRP was slightly more effective in enhancing column strength due to their higher modulus of elasticity compared to the glass FRP. The study also found that higher grades of concrete and lower aspect ratios led to higher strength and ductility in confined columns. Overall, the study suggests that the use of FRP composites for the confinement of RC columns is a viable method for enhancing their strength and ductility. These findings can be valuable for designing and retrofitting RC columns with FRP composites in practical applications.
References
ABAQUS. (2014). Abaqus 6.14. Abaqus 6.14 Analysis User’s Guide, 14.
Benzaid, R. and Mesbah, H.-A. (2013). Circular and Square Concrete Columns Externally Confined by CFRP Composite: Experimental Investigation and Effective Strength Models. In Fiber Reinforced Polymers - The Technology Applied for Concrete Repair, 167-201. https://doi.org/10.5772/51589
Carreira, D.J., and Chu, K.-H. (1985). Stress-Strain Relationship for Reinforced Concrete in Tension. Journal Proceedings, 83(1):21-28. https://doi.org/10.14359/1756
Cepero-Mejías, F., Curiel-Sosa, J.L., Zhang, C., and Phadnis, V.A. (2019). Effect of cutter geometry on machining induced damage in orthogonal cutting of UD polymer composites: FE study. Composite Structures, 214:439-450. https://doi.org/10.1016/j.compstruct.2019.02.012
Elkady.(2021). #21 ABAQUS Tutorial: Defining Concrete Damage Plasticity Model + Failure and Element Deletion [Video].youtube.https://youtu.be/wy84XGamn3g?si=HJgO_JVKonpsDu6b
Farghal, O.A. (2018). Structural Performance of Axially loaded FRP- Confined Rectangular Concrete Columns as Affected by Cross-section Aspect Ratio. HBRC Journal, 14(3):264-271. https://doi.org/10.1016/j.hbrcj.2016.11.002
Ghali, K.N., Rizkalla, S.H., Kassem, M.A., Fawzy, T.M., and Hussein Mahmoud, M. (2003). Frp-Confined Circular Columns Under Small Eccentric Loading. 5th Alexandria International Conference on Structural and Geotechnical Engineering, 1-10.
Günaslan, S.E., Karaşin, A., and Öncü, M.E. (2014). Properties of FRP Materials for Strengthening. International Journal of Innovative Science, 1(9):565-660.
Li, P., Sui, L., Xing, F., Li, M., Zhou, Y., and Wu, Y.-F. (2019). Stress–Strain Relation of FRP-Confined Predamaged Concrete Prisms with Square Sections of Different Corner Radii Subjected to Monotonic Axial Compression. Journal of Composites for Construction, 23(2):04019001. https://doi.org/10.1061/(ASCE)CC.1943-5614.0000921
Li, X., Lu, J., Ding, D.-D., and Wang, W. (2017). Axial strength of FRP-confined rectangular RC columns with different cross-sectional aspect ratios. Magazine of Concrete Research, 69(19):1,011-1,026. https://doi.org/10.1680/jmacr.17.00036
Lubliner, J., Oliver, J., Oller, S., and Oñate, E. (1989). A plastic-damage model for concrete. International Journal of Solids and Structures, 25(3):299-326. https://doi.org/10.1016/0020-7683(89)90050-4
Mahmoud, E.A., Khair, E., Nasser, F., Shafey, E. and Kassem, M.E. (2021). Effect of cross section aspect ratio and load eccentricity on the behavior of large scale RC columns wrapped with different CFRP layers. HBRC Journal, 17(1):93-121. https://doi.org/10.1080/16874048.2021.1884454
Mostofinejad, D., Moshiri, N., and Mortazavi, N. (2015a). Effect of corner radius and aspect ratio on compressive behavior of rectangular concrete columns confined with CFRP. Materials and Structures/Materiaux, 48:107-122. https://doi.org/10.1617/s11527-013-0171-9
Pan, Y., Rui, G., Li, H., Tang, H., and Xu, L. (2017). Study on stress-strain relation of concrete confined by CFRP under preload. Engineering Structures, 143:52-63. https://doi.org/10.1016/j.engstruct.2017.04.004
Parvin, A. and Brighton, D. (2014). FRP composites strengthening of concrete columns under various loading conditions. Polymers, 6(4):1,040-1,056. https://doi.org/10.3390/polym6041040
Raza, A., Khan, Q.U.Z., and Ahmad, A. (2019). Numerical investigation of load-carrying capacity of GFRP-reinforced rectangular concrete members using CDP model in ABAQUS. Advances in Civil Engineering, 2019:1-22. https://doi.org/10.1155/2019/1745341
Santiuste, C., Soldani, X., and Miguélez, M.H. (2010). Machining FEM model of long fiber composites for aeronautical components. Composite Structures, 92(3):691-698. https://doi.org/10.1016/j.compstruct.2009.09.021
Wu, Y.F. and Wei, Y.Y. (2010). Effect of Cross-Sectional Aspect Ratio on the Strength of CFRP-Confined Rectangular Concrete Columns. Engineering Structures, 32(1):32–45. https://doi.org/10.1016/j.engstruct.2009.08.012
Zhang, J., Liu, Y., Chen, Z., Cai, R., and Li, X. (2021). Seismic behavior of high-strength concrete-filled square steel tube columns reinforced with ultrahigh-strength reinforcing bars. Structures, 34:3,125-3,140. https://doi.org/10.1016/j.istruc.2021.09.06
