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Finite Element Analysis of Insulated Steel Beam Thermo-Elastoplastic Behavior


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DOI: https://doi.org/10.15866/irece.v14i3.22486

Abstract


This paper presents a finite element analysis of a steel beam’s behavior under fire. The studied structure is an unprotected HEB300 type, which was taken from the literature. In the first part of this study, the numerical model of the unprotected HEB300 beam was validated using numerical and experimental results from the literature and in the second part, the validated numerical model was used to study the concrete insulation effect on the beam thermo-elastoplastic behavior. In both parts, two analyses were carried out consisting of a thermal study to assess the temperature distribution along the beam as a function of time, followed by a thermo-elastoplastic analysis to evaluate the beam displacement. The result for the first part shows that the present finite element method predicts well the beam thermo-elastoplastic behavior. These results are very close to those of the literature. The use of a concrete insulator in the second part reduced the section average temperature from 800 °C to 125 °C and the vertical displacement from 120 mm to 3 mm for a duration of 35-minute fire exposure.
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Keywords


Thermo-Elastoplastic Behavior; Steel Beam; Insulation; Finite Element Analysis; Temperature; Displacement

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