PSI - Issue 79

Abubakr E.S. Musa et al. / Procedia Structural Integrity 79 (2026) 206–216

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Finally, it is evident that thickness reduction significantly reduces the column's failure load, as it directly influences the failure mode. Corroded columns are thus expected to experience considerable decreases in their failure loads, depending on the extent of corrosion. While this study is limited to thickness reduction at a specific location, it serves as a foundation for future investigations by the authors and other researchers in the field, providing valuable insights for more comprehensive studies on the impact of corrosion on the structural performance of axially loaded steel tubes. 5. Conclusions This study developed a FE modeling approach to investigate the axial behavior of corroded steel tubes while accounting for both intended and unintended imperfections. Corrosion-induced thickness reduction was first experimentally simulated by locally reducing the tube thickness, with varying reduction levels representing different degrees of corrosion damage. The FE model incorporated two types of imperfections: unintended initial imperfections, representing pre-existing tube irregularities, and intended imperfections, simulating the corrosion-induced thickness reductions. The shape and amplitude of the equivalent imperfection were calibrated based on the load-carrying capacity of intact laboratory specimens. After integrating these initial imperfections, corrosion-induced thickness reductions were introduced into the FE model. This approach effectively captured the influence of corrosion damage and provided accurate predictions of the axial behavior of corroded tubes. The close agreement between experimental and FE results validated the accuracy of the proposed modeling approach, establishing it as a reliable tool for future investigations into the structural performance of corroded steel tubes. A key limitation of the proposed equivalent imperfections is that they are designed to calibrate the failure load rather than accurately capture the failure mode. Consequently, comparing load values is more meaningful than comparing failure modes or load-deformation curves. Acknowledgements The authors greatly acknowledge the Interdisciplinary Research Center for Construction and Building Materials (IRC-CBM) at King Fahd University of Petroleum & Minerals (KFUPM) for the provided financial support to this work under project INCB#2427. References Ashraf, M., Gardner, L., & Nethercot, D. A. (2006). Finite element modelling of structural stainless steel cross-sections. Thin-Walled Structures, 44(10), 1048–1062. https://doi.org/10.1016/j.tws.2006.10.010 Ayd  n Korucuk, F. M., Maali, M., K  l  ç, M., & Ayd  n, A. C. (2019). Experimental analysis of the effect of dent variation on the buckling capacity of thin-walled cylindrical shells. Thin-Walled Structures, 143, 106259. https://doi.org/10.1016/j.tws.2019.106259 Gardner, L., & Nethercot, D. A. (2004). Numerical Modeling of Stainless Steel Structural Components—A Consistent Approach. Journal of Structural Engineering, 130(10), 1586–1601. https://doi.org/10.1061/(ASCE)0733-9445(2004)130:10(1586) Gavrilenko, G. D. (2004). Stability and load-bearing capacity of smooth and ribbed shells with local dents. International Applied Mechanics, 40(9), 970–993. https://doi.org/10.1007/s10778-005-0002-y Gavrilenko, G. D., & Krasovskii, V. L. (2004a). Calculation of Load-Carrying Capacity of Elastic Shells with Periodic Dents (Theory and Experiment). Strength of Materials, 36(5), 511–517. https://doi.org/10.1023/B:STOM.0000048400.64031.98 Gavrilenko, G. D., & Krasovskii, V. L. (2004b). Stability of Circular Cylindrical Shells with a Single Local Dent. Strength of Materials, 36(3), 260–268. https://doi.org/10.1023/B:STOM.0000035759.85256.6e Ghanbari Ghazijahani, T., Jiao, H., & Holloway, D. (2014). Experimental study on damaged cylindrical shells under compression. Thin-Walled Structures, 80, 13–21. https://doi.org/10.1016/j.tws.2014.02.029 Ghazijahani, T. G., Jiao, H., & Holloway, D. (2015). Structural behavior of shells with different cutouts under compression : An experimental study. JCSR, 105, 129–137. https://doi.org/10.1016/j.jcsr.2014.10.020 Krasovsky, V., & Evkin, A. (2021). Experimental investigation of buckling of dented cylindrical shells under axial compression. Thin-Walled Structures, 164, 107869. https://doi.org/10.1016/j.tws.2021.107869 Lai, M. H., Song, W., Ou, X. L., Chen, M. T., Wang, Q., & Ho, J. C. M. (2020). A path dependent stress-strain model for concrete-filled-steel-tube column. Engineering Structures, 211, 110312. https://doi.org/https://doi.org/10.1016/j.engstruct.2020.110312 Musa, A. E. S., Al-Shugaa, M. A., & Al-Gahtani, H. J. (2021). An equivalent imperfection-based FE simulation of the stability of dented cylindrical shells accounting for unintended imperfections. Thin-Walled Structures, 158. https://doi.org/10.1016/j.tws.2020.107159