Kocer, MustafaSen, Huseyin2026-01-102026-01-1020252076-3417https://doi.org/10.3390/app152412893https://hdl.handle.net/123456789/12893Steel portal frames are widely used in industrial buildings due to their high strength-to-weight ratio and rapid erection capability. However, many existing structures exhibit insufficient load-carrying capacity under current design requirements. This study investigates the use of external post-tensioning (PT) cables and rigid wedge anchorages to enhance the overall performance of steel portal frames. Two stages of numerical analysis were performed: (i) two-dimensional parametric studies to identify the most efficient configuration and (ii) three-dimensional verification under combined gravity, wind, and seismic loading conditions. Results show that the proposed PT system significantly increases the load-carrying capacity of both beams and columns, reduces bending demands, and improves global stability without major geometric modification. The strengthening method is safe, reversible, and offers a practical alternative to conventional welded or plated retrofit techniques.eninfo:eu-repo/semantics/openAccessStrengthening TechniquesPost-Tensioning CablesStructural RetrofitSteel StructuralIndustrial BuildingsSap2000Article10.3390/app1524128932-s2.0-105025892274