Experimental investigation of the effect of using steel fibers on the flexural behavior of prestressed concrete beams

Articles in Press

Document Type : Research Paper

Authors

1 Assistant Professor, Department of Civil Engineering, Faculty of Engineering, Ayatollah Boroujerdi University, Boroujerd, Iran

2 Associate Professor, Department of Civil Engineering, Faculty of Engineering, Bu-Ali Sina University, Hamedan, Iran

10.22124/jcr.2025.30262.1698

Abstract

The concrete used in prestressed members has higher strength than the concrete used in conventional reinforced concrete structures, and high-strength concretes have somewhat different behavior compared to conventional concretes. As the strength increases, the ductility of the concrete decreases and its brittleness increases. An important step towards overcoming this problem is the use of fibers in the concrete mix design. The purpose of this research is to use fibers in the concrete mix design used in the construction of prestressed specimens and to conduct a series of experiments to investigate the effect of the fibers used on the load-bearing capacity and structural performance of the prestressed specimens under study. For this purpose, 3 concrete beam specimens were fabricated in a prestressed form with given dimensions in the structural laboratory. The fibers used are steel fibers with a corrugated body and hook ends. The specimens were subjected to a four-point bending loading test for examination and the parameters of load-bearing capacity, energy absorption, effective stiffness, ductility and mid-span deflection were investigated. The results show that adding steel fibers to the concrete mix increased the compressive and tensile strengths of concrete and by increasing the volume percentage of this type of fiber, the compressive and tensile strengths also increased. Also, the parameters considered for investigating the bending behavior of the studied beams increase by adding steel fibers to the concrete mixture, and this increase is directly related to the increase in the volume percentage of fibers used in the concrete mixture.

Keywords

Main Subjects

Concrete Research

Articles in Press, Accepted Manuscript
Available Online from 06 October 2025

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