Strategic use of steel fibers and stirrups on enhancing impact resistance of ultra-high-performance fiber-reinforced concrete beams

Jin Young Lee, Tianfeng Yuan, Hyun Oh Shin, Young Soo Yoon

Research output: Contribution to journalArticle

Abstract

In order to investigate the static and dynamic flexural behavior of ultra-high-performance fiber-reinforced concrete (UHPFRC) beams, twelve half-scale beams (125 × 250 × 2438 mm) were fabricated and tested under quasi-static and drop-weight impact loading conditions. Four different volume fractions (vf) of steel fibers, i.e., 0, 0.5, 1.0, and 1.5%, and shear reinforcements were considered as test variables. Force-displacement relations and energy dissipating capacity were derived to evaluate and compare the impact resistance of the UHPFRC beams. The force-displacement curves, excluding inertial effects, were obtained by a proposed process using D'Alembert's dynamic equilibrium principle, and energy dissipating capacity was calculated by integrating the overlapped force-displacement curves of sequential impact tests. Furthermore, the equivalent blast load was converted from the impact force to extend the utilization of impact test results for substituting difficult blast tests on structural specimens. Lastly, the test results indicate that the addition of steel fibers and stirrups enhanced the static and impact resistances of the UHPFRC beams in terms of higher load carrying capacity, higher energy dissipating capacity, and lower maximum and residual displacements. As for specimens without steel fibers and stirrups, brittle shear failure occurred under static and impact loading conditions.

Original languageEnglish
Article number103499
JournalCement and Concrete Composites
Volume107
DOIs
Publication statusPublished - 2020 Mar

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Impact resistance
Steel fibers
Reinforced concrete
Fibers
Load limits
Volume fraction
Reinforcement

Keywords

  • Drop-weight impact test
  • Dynamic response factor
  • Energy dissipating capacity
  • Equivalent blast load
  • Ultra-high-performance fiber-reinforced concrete

ASJC Scopus subject areas

  • Building and Construction
  • Materials Science(all)

Cite this

Strategic use of steel fibers and stirrups on enhancing impact resistance of ultra-high-performance fiber-reinforced concrete beams. / Lee, Jin Young; Yuan, Tianfeng; Shin, Hyun Oh; Yoon, Young Soo.

In: Cement and Concrete Composites, Vol. 107, 103499, 03.2020.

Research output: Contribution to journalArticle

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