The paper presents an experimental study to investigate the effect of steel fiber (SF) on the mechanical behavior of self‐compacting concrete corbels after exposure to elevated temperatures. This research examines the most relevant parameters that influence the behavior of reinforced concrete corbels (RC‐corbels). These parameters comprise of the grade of concrete (medium [C50] and high strength concrete [C80]), the shear span‐to‐depth ratio (0.6 and 0.8), and the reinforcement ratio (0.82 and 1.6%). RC‐corbels were prepared from self‐compacting concrete with a constant percentage of polypropylene fiber of 0.1% and three different SF volume fractions of 0, 0.5, and 1.0%. All RC‐corbels were tested before and after exposure to elevated temperatures (250, 500 and 750 °C). The results were presented in terms of load–deflection curves, crack patterns and failure modes. Results showed that the SFs have a positive effect on load‐carrying capacity and ductility of RC‐corbels both before and after exposure to elevated temperatures.
To represent the structural behavior of self-compacted concrete filled steel tube composite columns under axial compression loading after high temperatures exposure, a nonlinear three-dimensional finite element analysis model has been achieved to analyze these columns using ANSYS R-15 software. An eight-node solid brick element (Solid65) is used to represent the concrete, while a four-node isoparametric shell element (Shell63) is used to represent the steel tube for the analyzed composite columns. A Newton-Raphson incremental-iterative approach is used to simulate the nonlinear solution technique. The finite element method results indicated that the predicted ultimate loads and axial deformations for the analyzed four column specimens agree well with the experimental results for normal strength and high strength concrete in static loading up to failure, and therefore, it is sufficient to model how these columns behave. The reduction in the analytical ultimate loads compared to the experimental values ranged from 11% and 16%, while the reduction in the total axial deformation values ranged from 3% to 7%. The yield patterns obtained from the analyzed composite columns under axial compressive stress are comparable to the yield patterns determined from the experimental study.
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