PSI - Issue 37

Available online at www.sciencedirect.com Structural Integrity Procedia 00 (2019) 000 – 000 Available online at www.sciencedirect.com ScienceDirect

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Procedia Structural Integrity 37 (2022) 660–667

ICSI 2021 The 4th International Conference on Structural Integrity Models for Predicting Strength of RC Columns Strengthened with

NSM-CFRP Strips and CFRP-Fabric Wraps Jamal A. Abdalla a* , Raed Abokwiek a , Rami A. Hawileh a a Department of Civil Engineering, American University of Sharjah, Sharjah, United Arab Emirates * Corresponding author; email: jabdalla@aus.edu

© 2022 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of Pedro Miguel Guimaraes Pires Moreira Abstract A comprehensive experimental investigation was carried out on reinforced concrete (RC) columns strengthened with near surface mounted (NSM) Carbon fiber reinforced polymer (CFRP) strips with CFRP fabric wraps as confinement. The number of NSM CFRP strips and the number of CFRP-Fabric wraps were varied. The RC columns were subjected to concentric and eccentric loads with different eccentricities that resulted in uniaxial bending. Significant improvements in strength and ductility were observed in the strengthened columns compared to that of the control specimen. In this investigation four empirical models, based on the experimental results, were developed to predict the un-strengthened and the NSM-CFRP strengthened RC columns using different parameters. The capacities of the columns predicted by the developed empirical models were validated using the obtained experimental results. It is observed that the developed empirical models have exponential decay and a near-perfect fit to the experimental results, with R 2 averaging more than 99% and an average mean absolute percent error (MAPE) of 6.6%. It is concluded that the developed models can be used as useful tools for predicting capacity of columns with NSM-CFRP strips and CFRP wraps under axial loading and uniaxial bending. © 2022 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) u ub i V. h s n p c h N

Peer-review under responsibility of Pedro Miguel Guimaraes Pires Moreira Keywords: NSM-CFRP; CFRP Wraps Retrofitting; Column Capacity Predictions

1. Introduction Carbon fiber reinforced polymer (CFRP) laminates (plates) and sheets have been used extensively for strengthening deficient and deteriorating reinforced concrete (RC) beams and columns (Hollaway 2010, Rasheed 2014, Naser et al. 2019). They have been used for flexure and shear strengthening of RC beams (Mhanna et al. 2019; Hawileh et al. 2017; Nawaz et al. 2016), while CFRP sheets have been used for confining columns to increase their axial capacity

2452-3216 © 2022 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of Pedro Miguel Guimaraes Pires Moreira

2452-3216 © 2022 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of Pedro Miguel Guimaraes Pires Moreira 10.1016/j.prostr.2022.01.135