Amirkabir University of Technology AUT Journal of Civil Engineering 2588-2899 3 1 2019 06 01 Reliability Assessment of CFRP-Strengthened Deficient Steel SHS Columns 23 36 3122 10.22060/ajce.2018.14939.5506 EN M. Shahraki Department of Civil Engineering, University of Sistan and Baluchestan, Zahedan, Iran M.R. Sohrabi Department of Civil Engineering, University of Sistan and Baluchestan, Zahedan, Iran Gh. Azizian Department of Civil Engineering, University of Sistan and Baluchestan, Zahedan, Iran K. Narmashiri Department of Civil Engineering, Zahedan Branch, Islamic Azad University, Zahedan, Iran 0000-0003-1767-7424 Journal Article 2018 09 06 Civil engineers have always been vexed by such numerous problems such as buckling, corrosion, bending, and over-loading in damaged steel structures. The present study is aimed to evaluate the effects of the axial loading, axial displacement, stiffness and deficiency location on the length of the deficient steel SHS columns have been evaluated based on a detailed parametric study. Three specimens were tested to failure under axial compression in the lab and simulated using the Finite Element (FE) numerical approach and a total of 100 samples were analyzed by ABAQUS using the MATLAB software to predict the suitable limit state functions and determine the best R2 value through such soft computing techniques as the Artificial Neural Networks, Adaptive Neuro-Fuzzy Inference System, Response Surface Method, and Gene Expression Programming. Finally, the failure probability and reliability index were obtained by the FORM and Monte Carlo methods on the suggested limit state functions. Results indicated that using CFRP sheets reduced the stress in the damaged location and appropriately prevented or delayed local deformations around the deficient location. So, strengthening steel columns with CFRP can play a significant role in enhancing the rate of the critical load and β, and reducing (Pf ), in deficient columns.

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