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Background <p>The seismic performance of reinforced concrete (RC) beams remains a critical research area due to the need for improved ductility and energy dissipation under cyclic loads. Traditional reinforcement strategies are often insufficient to control crack propagation and post-yield behavior, especially under large deformations.</p> Objective <p>This study evaluates the effectiveness of steel fiber inclusion in RC beams subjected to cyclic loading, focusing on performance enhancement without reducing conventional reinforcement, as well as methodological refinement in experimental testing.</p> Methods <p>Full-scale beam-column joints were tested under displacement-controlled cyclic loading. Steel fibers were added at a 0.7% volume fraction to selected specimens, while conventional reinforcement remained unchanged. Advanced instrumentation, including strain gauges and Digital Image Correlation (DIC), was employed to capture crack development, strain evolution, and stiffness degradation. Special attention was given to the experimental configuration, which was optimized to ensure boundary condition stability and accurate measurements.</p> Results <p>Fiber-reinforced specimens exhibited enhanced energy dissipation (24.57%), improved stiffness (18.36%), and delayed damage progression, compared to non-fiber specimens. Strain analyses indicated delayed yielding and more gradual post-peak behavior in longitudinal reinforcement, while transverse bars remained elastic in fiber-reinforced beams. The DIC method successfully captured crack evolution, though its effectiveness decreased at high damage levels.</p> Conclusions <p>The results confirm that even a minimal fiber dosage can yield measurable structural benefits, improving post-yield behavior, crack control, and residual capacity. Beyond material effects, this study also contributes to experimental methodology, including test setup refinement and full-field strain monitoring. The results offer valuable mechanistic insight into the seismic response of fiber-reinforced beams.</p>

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Influence of Steel Fibers on the Hysteretic Response of Reinforced Concrete Beams with Detailed Strain Monitoring

  • 期刊论文

  • 发表日期：

    2025年11月6日

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  • E. E. Espino-Robles,
  • J. H. Chávez-Gómez,
  • M. Mesa-Lavista,
  • F. A. Carpio-Santamaría,
  • J. Álvarez-Pérez

摘要

Background

The seismic performance of reinforced concrete (RC) beams remains a critical research area due to the need for improved ductility and energy dissipation under cyclic loads. Traditional reinforcement strategies are often insufficient to control crack propagation and post-yield behavior, especially under large deformations.

Objective

This study evaluates the effectiveness of steel fiber inclusion in RC beams subjected to cyclic loading, focusing on performance enhancement without reducing conventional reinforcement, as well as methodological refinement in experimental testing.

Methods

Full-scale beam-column joints were tested under displacement-controlled cyclic loading. Steel fibers were added at a 0.7% volume fraction to selected specimens, while conventional reinforcement remained unchanged. Advanced instrumentation, including strain gauges and Digital Image Correlation (DIC), was employed to capture crack development, strain evolution, and stiffness degradation. Special attention was given to the experimental configuration, which was optimized to ensure boundary condition stability and accurate measurements.

Results

Fiber-reinforced specimens exhibited enhanced energy dissipation (24.57%), improved stiffness (18.36%), and delayed damage progression, compared to non-fiber specimens. Strain analyses indicated delayed yielding and more gradual post-peak behavior in longitudinal reinforcement, while transverse bars remained elastic in fiber-reinforced beams. The DIC method successfully captured crack evolution, though its effectiveness decreased at high damage levels.

Conclusions

The results confirm that even a minimal fiber dosage can yield measurable structural benefits, improving post-yield behavior, crack control, and residual capacity. Beyond material effects, this study also contributes to experimental methodology, including test setup refinement and full-field strain monitoring. The results offer valuable mechanistic insight into the seismic response of fiber-reinforced beams.