PSI - Issue 37

Jamal A. Abdalla et al. / Procedia Structural Integrity 37 (2022) 660–667 Abdalla et al./ Structural Integrity Procedia 00 (2019) 000 – 000

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6. Summary and Conclusions • Exponential and linear empirical models were developed in this study. The models were able to predict the load carrying capacity of the axially and uniaxially loaded columns with a very good accuracy compared to experimental results. • The gain in load carrying capacity is highly dependent on the number of CFRP wraps, yet it is inversely proportional to the eccentricity ratio. • The developed empirical models have exponential decay and a near-perfect fit to the experimental results, especially the exponential models, with R 2 averaging more than 99% and an average mean absolute percent error (MAPE) of 6.6%. • The developed linear models showed reasonable accuracy in predicting the axial load capacity of axially and uniaxially loaded columns with R 2 ranging between 89-98% and an average MAPE of 23.6%. Acknowledgement References Abokwiek, R., Abdalla, J. A., Hawileh, R. A., and El-Maaddawy, T. 2021. RC Columns Strengthened with NSM-CFRP Strips and CFRP Wraps under Axial and Uniaxial Bending: Experimental Investigation and Capacity Models. Journal of Composites for Construction , 25 (2), 04021009. https://doi.org/10.1061/(asce)cc.1943-5614. 0001117. Abdalla, J. A., Hawileh, R. A., Nawaz, W., and Mohammed, A. 2018. Reinforced concrete beams externally strengthened in flexure using hybrid systems. In 2018 Advances in Science and Engineering Technology International Conferences (ASET) (1-5). IEEE. Barros, J. A., Varma, R. K., Sena-Cruz, J. M., & Azevedo, A. F. 2008. Near surface mounted CFRP strips for the flexural strengthening of RC columns: Experimental and numerical research. Engineering Structures, 30(12), 3412-3425. Chellapandian, M., Prakash, S. S. and Sharma, A. 2019. Experimental Investigation of the Effectiveness of Hybrid FRP – Strengthened RC Columns on Axial Compression – Bending Interaction Behavior. J. Compos. Constr., 23(4): 04019025. El-Hacha R. and Rizkalla S.H. 2004. Near-surface-mounted fiber-reinforced polymer reinforcements for flexural strengthening of concrete structures. ACI Structural Journal, 101(5), 717 – 726. ElMaaddawy, T. 2009. Strengthening of Eccentrically Loaded Reinforced Concrete Columns with Fiber-Reinforced Polymer Wrapping System: Experimental Investigation and Analytical Modeling. J. Compos. Constr., 13(1), 13-24. Gajdosova, K., & Bilcik, J. 2013. Full-scale testing of CFRP-strengthened slender reinforced concrete columns. Journal of composites for construction, 17(2), 239-248. Hadi, M. and Widiarsa, I. 2012. Axial and Flexural Performance of Square RC Columns Wrapped with CFRP Under Eccentric Loading. J. Comp. Cons., 16(6), 640-649. Hawileh, R., Salama, A. S., & Abdalla, J. 2017. Strengthening of reinforced concrete beams in flexure with side bonded CFRP laminates. Conference on Durability of Fiber Reinforced Polymer (FRP) Composites for Construction and Rehabilitation of Structures (CDCC 2017). Hollaway, L.C..2010. A review of the present and future utilisation of FRP composites in the civil infrastructure with reference to their important in-service properties. Construction and Building Materials, 24(12), pp. 2419-2445. Khorramian, K., & Sadeghian, P. 2019. Performance of high-modulus near-surface-mounted FRP laminates for strengthening of concrete columns. Composites Part B: Engineering, 164, 90-102. Rasheed, H. A. 2014. Strengthening design of reinforced concrete with FRP. CRC Press. Mhanna, H. H., Hawileh, R. A., & Abdalla, J. A. 2019. Shear strengthening of reinforced concrete beams using CFRP wraps. Procedia Structural Integrity, 17, 214-221. Naser, M. Z., Hawileh, R. A., and Abdalla, J. A. 2019. Fiber-reinforced polymer composites in strengthening reinforced concrete structures: A critical review. Engineering Structures, 198, 109542. Nawaz, W., Hawileh, R. A., Saqan, E. I., and Abdalla, J. A. 2016. Effect of longitudinal carbon fiber-reinforced polymer plates on shear strength of reinforced concrete beams. ACI Structural Journal, 113(3). Obaidat, Y. T., Barham, W. S., & Attar, K. M. 2021. Behavior of NSM CFRP Reinforced Concrete Columns: Experimental and Analytical Work. Case Studies in Construction Materials, e00589. Triantafyllou, G.G., Rousakis, T.C. and Karabinis, A.I. 2015. Axially loaded reinforced concrete columns with a square section partially confined by light GFRP straps. Journal of Composites for Construction, 19(1): 04014035. Zhang, S.S.Yu, T. and Chen, G.M. 2017. Reinforced concrete beams strengthened in flexure with near-surface mounted (NSM) CFRP strips: Current status and research needs. Composites Part B: Engineering131(15), Pages 30-42. Sika ® CarboDur ® -S1.525. 2009. Pultruted carbon fiber plates for structural strengthening product data sheet. Sikadur ® -30 LP. 2006. Adhesive for Bonding Reinforcement, product data sheet. Sikadur ® -330. 2014. 2-part epoxy impregnation resin, product data sheet. SikaWrap ® -300C. 2003. Carbon Fiber Fabric for Structural Strengthening product data sheet.