BESSAYAH MOHAMEDBRIKI ABDELHAKIM YASSINEABDERRAHMANE SAID2026-09-132026-09-132026https://dspace.univ-temouchent.edu.dz/handle/123456789/7556This research investigates the optimization of external prestressing tendons in large-span concrete bridges, in accordance with the Eurocode 2 (EN 1992-2) standards. The study aims to surpass the limitations of conventional design by determining optimal tendon profiles to ensure an efficient stress distribution and material reduction. The theoretical framework was applied to a high-scale bridge case study using Midas Civil structural analysis software. The findings demonstrate the ineffectiveness of external prestressing tendons in mitigating tensile stresses for this specific bridge type, despite systematic modifications to tendon layouts and the application of increased prestressing forces in line with current technical recommendations.enExternal Prestressing TendonsLarge-Span BridgesStructural OptimizationTensile StressesSecondary MomentsNumerical Modeling (Midas Civil)Eurocode 2Thesis