Abstract

This paper presents an experimental study of eight reinforced concrete beams and aims to evaluate the flexural behavior and ductility of burned beams at various temperatures. The beam specimens contained steel fibers comprising 0.5% of the volume of the concrete. They were divided into two types, with the flexural region consisting of a single reinforcement system (without compressive reinforcement) and double reinforcement bars. Each type of beam was controlled (not burned), and burned at 300°C, 600°C and 900°C. The beam testing employed a four-point loading system (pure bending in the test region) and worked monotonically. The experimental results show that the performance of beams with the double reinforcement system to the resilient load was better than with a single reinforcement system beam. This occurred at normal temperatures and up to high temperatures. The longitudinal reinforcement installed inside the beam was very well protected and only lost yield stress of 17% of the initial stress, even though the beam was burned at high temperatures. The analysis of the flexural beam capacity using the stress-strain model of steel fibers at elevated temperatures shows that the results differed little from the flexural capacity of the experimental results.