@Article{sdhm.2026.081538,
AUTHOR = {Mohamed Zitouni, Belkacem Lamri, Abdelhak Kada, Mário Rui Arruda},
TITLE = {Numerical Investigation into the Mechanical Performance of Hybrid Fiber-Reinforced Self-Compacting Concrete Beams at High Temperature},
JOURNAL = {Structural Durability \& Health Monitoring},
VOLUME = {},
YEAR = {},
NUMBER = {},
PAGES = {{pages}},
URL = {http://www.techscience.com/sdhm/online/detail/26979},
ISSN = {1930-2991},
ABSTRACT = {The use of self-compacting concrete (SCC) in structural elements has significantly increased in recent years due to its superior fresh properties, including high flowability, ease of placement, and ability to consolidate without vibration, making it particularly suitable for complex and densely reinforced structures. However, despite these advantages, SCC presents certain limitations when exposed to fire, which is considered one of the most severe threats to structural safety. This is mainly due to the lack of comprehensive understanding and design guidelines regarding its behaviour under elevated temperatures, particularly at the structural element level. This paper presents a numerical investigation of the mechanical behaviour of hybrid fibres reinforced self-compacting concrete (HFSCC) beams under high temperatures due to fire using a finite element (FE) model. Three beams are analysed, one without fibres (SCC), and the others, with hybrid fibres, having the fixed volume fraction (VF) of polypropylene fibre of 0.1% and a VF of steel fibres of 1% and 2%. All beams are simulated using ANSYS software and analysed at ambient and elevated temperatures at 400°C, 600°C, and 800°C. The numerical study is carried out to evaluate the behaviour of beams, considering geometric and material nonlinearities. The numerical results suggest that at room temperature (20°C), adding hybrid fibres, 0.1% VF of polypropylene, and VF of 1% steel to SCC beams increases ultimate load capacity by 17.9%, and with an increase in the VF of steel fibres to 2%, the load capacity further improves to 30.8%. At elevated temperatures (400°C, 600°C, and 800°C), the addition of hybrid fibres reduces the rate of reduction of ultimate load capacity of SCC beams, particularly significant when 2% VF of steel fibres are used.},
DOI = {10.32604/sdhm.2026.081538}
}