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Numerical Study on Steel Reinforced Concrete Filled Steel Tubular Columns of Circular and Square Sections Exposed to Fire


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DOI: https://doi.org/10.15866/irece.v15i1.23588

Abstract


Steel Reinforced Concrete Filled Steel Tubular (SRCFST) columns are composed of a steel profile inside. This allows improving the structural capacity of the columns, as well as their resistance to fire exposure. The present investigation is focused on evaluating the behavior of SRCFST columns with circular and square cross section. The research involves the study of the effect of materials, geometric parameters, humidity, temperature and deformation in columns exposed to fire. The development of the research was carried out by means of numerical modeling. From the results of the research, it is shown that the exposure of SRCFST columns to fire can cause a 25% decrease in their residual strength index. Material properties such as steel yield strength and concrete compressive strength do not affect the fire resistance of SRCFST columns. The increase in steel concentration in the cross-section, and the slenderness ratio cause an increase of 17% and 14% in the plastic strength of the columns. In general, the research evidences that circular columns have a 23% increase in plastic strength when compared to square columns. In general, the circular cross section allows a 7.7% decrease in the temperature levels inside the column. Additionally, this type of column has lower axial and lateral deformations compared to square columns.
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Keywords


SRCFST; Numerical Model; Fire Resistance; Geometric Parameters; Deformation; Cross-Section

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