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Structural Engineering and Mechanics
  Volume 78, Number 1, April10 2021 , pages 67-75
DOI: https://doi.org/10.12989/sem.2021.78.1.067
 


The fire-risks of cost-optimized steel structures: Fire-resistant and hot-rolled carbon steel
Harkaitz Garcia, Jesus Cuadrado, Maria V. Biezma and Inigo Calderon

 
Abstract
    This work studies the behaviour of a steel portal frame selection under fire exposure, considering both span lengths and fire exposure times as variables. Such structures combine carbon steel (S275), fireproof micro-alloyed steel (FR), and coatings of intumescent paint with variable thicknesses, improving thereby the flame retardant behaviour of the steel structure. Thus, the main contribution of this study is the optimization of the portal frames by combining both steels, analysing the resulting costs influence on the final dimensions. Besides, the topological optimization of each steel component within the structure is also defined, in accordance with the following variables: weather conditions, span, paint thickness, and cost of steel. The results mainly confirmed that using both FR and S275 grades with intumescent painting is the Pareto optimum when considering performance, feasibility and costs of such portal frames widely used for industrial facilities.
 
Key Words
    fire resistance steel; FR; metallic structure; intumescent paint; dimensioning method; structural optimization
 
Address
Harkaitz Garcia: Department of Mechanical Engineering, University of the Basque Country (UPV/EHU), 48940 Leioa Vizcaya, Spain
Jesus Cuadrado: Department of Mechanical Engineering, University of the Basque Country (UPV/EHU), 48940 Leioa Vizcaya, Spain
Maria V. Biezma: Department of Earth and Materials Science and Engineering, University of Cantabria, 39004 Santander, Spain
Inigo Calderon: Sustainable Construction Division, Tecnalia Research and Innovation, 20009 San Sebastian, Guipuzcoa, Spain
 

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