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Relevant aspects for computational modeling of composite beams in fire situations: an approach based on the interaction between steel-concrete and the mechanical behavior of the materials
DOI:
https://doi.org/10.5216/reec.v20i2.78269Keywords:
Composite structures, Elevated temperatures, Steel-concrete interface, Finite element method, AbaqusAbstract
The present work proposes a methodology for modeling steel and concrete composite beams in fire situations, emphasizing the computational treatment of the steel-concrete interface and the mechanical behavior of the materials at high temperatures. For this, three studies were developed covering the mechanical, thermal, and thermomechanical analysis of steel and concrete composite beams. In all studies, the results obtained showed good agreement with the experimental and numerical reference results, indicating that the strategies used to simulate the shear connectors and the mechanical behavior of the materials, both at room temperature and at elevated temperatures, are appropriate. Although understanding the behavior of composite structures in fire situations is challenging due to the numerous uncertainties associated with heat transfer phenomena and accurate tests at high temperatures, the computational model developed could adequately represent the thermomechanical behavior of the composite beam analyzed. The computational modeling methodology proposed in this work can assist in developing new studies in the area.
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