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Background <p>Understanding slab behavior under repeated impact is critical for designing resilient structures exposed to dynamic loads.</p> Purpose <p>This study investigates the combined influence of support conditions and concrete type on the impact response of reinforced slabs withvarying dimensions.</p> Methods <p>Both experimental drop-weight impact tests and Finite Element Analysis (FEA) were performed to evaluate crack initiation, failureprogression, and displacement response.</p> Results <p>Initial Crack (IC) and Final Crack (FC) impacts were recorded to assess energy absorption capacity. Under fixed (FS) conditions,conventional concrete slabs (FS-CC-500 and FS-CC-1000) sustained high FC counts (232 and 240) despite early IC, indicating brittle initiation butprolonged resistance. Steel fiber reinforced slabs (e.g., FS-SFRC-750) delayed IC to 62 impacts yet failed at 182, reflecting faster but more controlledfracture progression. Stress contour plots from FEA confirmed higher tensile stress localization near the impact zone in FS slabs, while simplysupported (SS) slabs exhibited wider stress distribution. Maximum displacement in SS-SFRC-500 reached 18.6 mm, closely matching test results.Among SS specimens, CC slabs demonstrated superior post-crack endurance (IC at 64, FC at 317), while SFRC slabs showed early IC but exceptionalimpact tolerance, sustaining up to 390 impacts due to fiber bridging.</p> Conclusion <p>Overall, SFRC improved damage tolerance under SS conditions, whereas FS enhanced crack resistance. The findings highlight thesignificant role of support flexibility and material composition in dictating energy absorption and failure mechanisms under repeated impact.</p>

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Comparative Study on the Impact Response of Conventional and Steel Fiber Reinforced Slabs Under Different Support Conditions

  • 期刊论文

  • 发表日期：

    2026年2月18日

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  • Hemanth Kumar A,
  • P Udhayanithi,
  • K. Karthikeyan

摘要

Background

Understanding slab behavior under repeated impact is critical for designing resilient structures exposed to dynamic loads.

Purpose

This study investigates the combined influence of support conditions and concrete type on the impact response of reinforced slabs withvarying dimensions.

Methods

Both experimental drop-weight impact tests and Finite Element Analysis (FEA) were performed to evaluate crack initiation, failureprogression, and displacement response.

Results

Initial Crack (IC) and Final Crack (FC) impacts were recorded to assess energy absorption capacity. Under fixed (FS) conditions,conventional concrete slabs (FS-CC-500 and FS-CC-1000) sustained high FC counts (232 and 240) despite early IC, indicating brittle initiation butprolonged resistance. Steel fiber reinforced slabs (e.g., FS-SFRC-750) delayed IC to 62 impacts yet failed at 182, reflecting faster but more controlledfracture progression. Stress contour plots from FEA confirmed higher tensile stress localization near the impact zone in FS slabs, while simplysupported (SS) slabs exhibited wider stress distribution. Maximum displacement in SS-SFRC-500 reached 18.6 mm, closely matching test results.Among SS specimens, CC slabs demonstrated superior post-crack endurance (IC at 64, FC at 317), while SFRC slabs showed early IC but exceptionalimpact tolerance, sustaining up to 390 impacts due to fiber bridging.

Conclusion

Overall, SFRC improved damage tolerance under SS conditions, whereas FS enhanced crack resistance. The findings highlight thesignificant role of support flexibility and material composition in dictating energy absorption and failure mechanisms under repeated impact.