Sharif University of Technology Scientia Iranica 1026-3098 Articles in Press 2023 05 10 Prediction of ultimate strength of FRP-confined predamaged concrete using backward multiple regression motivated soft computing methods 23225 10.24200/sci.2023.60227.6674 EN I. A. Tijani School of Engineering, The University of British Columbia, Kelowna, BC, V1V 1V7, Canada A. I. Lawal - Department of Energy Resources Engineering, Inha University Yong-Hyun Dong, Nam Ku, Incheon, Korea - Department of Mining Engineering, Federal University of Technology, Akure, Nigeria N. O. Ogunsola Department of Mineral Resources and Energy Engineering, Jeonbuk National University, Jeonju-si, Jeollabuk-do, South Korea S. Kwon Department of Energy Resources Engineering, Inha University Yong-Hyun Dong, Nam Ku, Incheon, Korea Journal Article 2022 04 06 Confining structurally deficient concrete columns with externally bonded fiber-reinforced polymer (FRP) has been widely accepted as an effective technology for strengthening the ductility and strength of deficient concrete columns. However, prediction models for damaged and afterward repaired concrete based on soft computing methods are not available for the planning and maintenance of concrete structures. Therefore, this paper adopted two soft computing methods – artificial neural network (ANN) and Gaussian process regression (GPR) – to analyze observations obtained from 103 datasets of concentrically loaded FRP-confined predamaged concrete. The models only consider statistically significant variables with the ultimate strength of FRP-confined predamaged concrete. The statistically significant variables based on the multivariate regression analysis are corner radius ratio, FRP thickness, concrete strength, and damage degree. The coefficient of determination of the developed models is greater than 98% and there is a relatively low error between the measured and predicted values. The results of the current study highlight the merit of using soft computing methods in concrete technology given their extraordinary ability to comprehend multidimensional phenomena of concrete structures with ease and high predictivity over the existing empirical models. https://scientiairanica.sharif.edu/article_23225_86078d741056331074d8a8dfaec5161d.pdf