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Structural Engineering and Mechanics Volume 92, Number 1, October10 2024 , pages 53-64 DOI: https://doi.org/10.12989/sem.2024.92.1.053 |
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Stability of prestressed steel I beams subjected to fire |
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Abdellah Mahieddine, Noureddine Ziane, Giuseppe Ruta, Rachid Zahi, Mohamed Zidi and Sid Ahmed Meftah
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| Abstract | ||
| This paper presents an innovative theoretical and numerical model to predict the lateral-torsional buckling (LTB) of simply supported steel I-beams with external prestressed tendons. The model incorporates an updated prestressing force, accounting for thermal effects and various external loadings. Critical multipliers are determined by solving an eigenvalue problem derived from applying Galërkin's approach to a set of nonlinear equilibrium equations. Validation is carried out through Finite Element Method (FEM) simulations, incorporating a new expression for an equivalent thermal expansion coefficient for the beam-tendon system, addressing both mechanical and thermal deformations. The primary aim is to estimate critical conditions considering material property degradation due to fire. The present results are generally in good agreement with those provided by the literature. | ||
| Key Words | ||
| cable; fire; LTB; prestressed I beams; steel | ||
| Address | ||
| Abdellah Mahieddine, Noureddine Ziane, Mohamed Zidi, Sid Ahmed Meftah: Laboratoire des Structures et Matériaux Avancés dans le Génie Civil et Travaux Publics, Université de Djillali Liabes, Sidi Bel Abbes, Algeria Giuseppe Ruta: Department of Structural and Geotechnical Engineering, University "La Sapienza", Rome, Italy Rachid Zahi: University of Relizane, Relizane, Algeria | ||