Finite element modeling of reinforced concrete beams exposed to fire

• Published in: Engineering structures Vol. 52; pp. 488 - 501
• Main Authors: Gao, W.Y., Dai, Jian-Guo, Teng, J.G., Chen, G.M.
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier Ltd 01.07.2013; Elsevier
• Subjects: Applied sciences; Beams (structural); Bond-slip behavior; Building structure; Building technical equipments; Buildings; Buildings. Public works; Computation methods. Tables. Charts; Computer simulation; Construction (buildings and works); Exact sciences and technology; Exposure; Finite element method; Finite element model; Fire behavior of materials and structures; Fire protection; Fire resistance; Fires; Mathematical models; Performance-based design; Reinforced concrete; Reinforced concrete beams; Reinforced concrete structure; Reinforcing steels; Steel-to-concrete interfaces; Structural analysis. Stresses; Fire resistance; Performance-based design; Finite element model; Steel-to-concrete interfaces; Bond-slip behavior; Reinforced concrete beams; Constitutive equation; Script; Temperature; Modeling; Beam(mechanics); Reinforced concrete; Finite element method; Thermal properties; Fires; Concrete construction; Behavior; Performance; Steel concrete; Interface
• ISSN: 0141-0296; 1873-7323
• DOI: 10.1016/j.engstruct.2013.03.017

•Finite element (FE) modeling of RC beams exposed to fire was highlighted.•Particular attention was paid to the modeling of interfacial bond-slip behavior.•Comparisons between existing test data and numerical results were presented.•FE predictions provided a good understanding of the local behavior of RC beams under fire. The practical implementation of performance-based fire safety design of reinforced concrete (RC) structures hinges on the availability of accurate numerical simulation tools for the behavior of RC members exposed to fire. This paper presents a three-dimensional (3D) finite element (FE) model for the accurate prediction of both the thermal and the mechanical behavior of RC beams exposed to fire. In this FE model, particular attention is paid to the modeling of interfacial bond-slip behavior between the reinforcing steel and the concrete, an aspect which has rarely been considered by previous numerical studies. Results obtained from this FE model are compared with existing test data to examine the accuracy of the model. This comparison shows that the inclusion of the steel-to-concrete interfacial behavior leads to more accurate predictions of the deflection of RC beams exposed to fire. Predictions from this FE model also allow the complex distribution and evolution of stresses in the reinforcing steel and the concrete to be examined in detail, leading to a better understanding of the local responses of RC beams exposed to fire. The FE model presented in the paper can be used directly in performance-based fire safety design of RC beams; it can also be employed in parametric studies aimed at developing simple design rules.