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Abstract
The use of steel fiber in concrete material can improves both the strength and the ductility of concrete. The fibers can postpone or mitigate the concrete cover spalling under severe loading conditions such as during an earthquake. In this paper, the behavior of Steel Fiber Reinforced Concrete (SFRC) under compression is modeled using the Attard and Setunge’s stress-strain model. The parameter identification consisted of the elastic modulus (Ec), the peak strength (/cc), the residual strength (fes), and the peak strain of concrete under compression (ecc). From the investigation, it is found that the models proposed for active confined concrete can be applied for steel fiber reinforced concrete. It was also shown that the axial strain at peak stress increases as the fiber volumetric ratio and fiber aspect ratio increased. A simple formula to predict the approximate value of confining pressure to account for the steel fiber presence is proposed. The verification of the proposed model with the experimental results is presented in detail. Furthermore, insight into the performance of the reinforced concrete column made of SFRC using the fiber-based cross-sectional analysis is sighted.
Highlights
During earthquakes, reinforced concrete members may experience significant lateral deformation accompanied by the concrete cover spalling due to large compressive strain [1]
With the presence of steel fiber, the peak axial strength and the axial strain at peak stress for concrete are enhanced which is as if a small active confining pressure were applied to the concrete
As the concrete with steel fiber is loaded beyond the peak strength, the concrete shows some residual strength capacity
Summary
During earthquakes, reinforced concrete members may experience significant lateral deformation accompanied by the concrete cover spalling due to large compressive strain [1]. To improve its performance and prevent the cover spalling, the use of steel fiber is found to be promising [2,3,4]. With the presence of steel fiber, the peak axial strength and the axial strain at peak stress for concrete are enhanced which is as if a small active confining pressure were applied to the concrete. As the concrete with steel fiber is loaded beyond the peak strength, the concrete shows some residual strength capacity. This enhancement is found to be affected by the fiber volumetric ratio. This paper presents the parameter identification for modeling the Steel-Fiber Reinforced Concrete (SFRC)
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