Split-Hopkinson Pressure Bar Test and Numerical Simulation of Steel Fiber-reinforced High-strength Concrete

Abstract

The fabrication and optimization of the shelter layer are critical to the performance of the protective works. The novel shelter layer made of steel fiber-reinforced high-strength concrete (SFRHSC) is much more advantageous than that of ordinary concrete. This paper carries out a split-Hopkinson pressure bar (SHPB) test on the steel fiber and high-strength concrete, two main components of the SFRHSC, aiming to disclose the failure features and dynamic compressive strength of the SFRHSC under dynamic conditions. Specifically, the SFRHSC specimens with 0 %, 0.5 % and 1.0 % of steel fiber were subjected to impact compression test under the air pressures of 0.7, 0.9 and 1.0MPa, respectively. In addition, the impact compression process was also numerically simulated on the finite-element software LS-DYNA. The research results show that: the increase in strain rate pushed up the dynamic compressive strength of the SFRHSC, that is, the failure degree of the specimen was greatly enhanced by the strain rate; under the air pressure of 0.7MPa, the specimen with 1.0 % of steel fiber had the highest dynamic compressive strength (180.9MPa), 22.6 % higher than that of the specimen with no steel fiber; the numerical simulation reproduced the one-dimensional (1D) propagation of the stress wave in the bars, which proves the hypothesis of 1D elastic stress wave, and restaged the impact compression process on the SFRHSC, outputting results similar to the test data. Keywords: steel fiber-reinforced high-strength concrete (SFRHSC), impact compression, strain rate effect, numerical simulation Camouflaged layer Bursting layer Distribution layer Supporting structure Revue des Composites et des Matériaux Avancés

Effect of Additional Fiberglass Fiber on Concrete Performance

“…The fabrication and optimization of the occupancy layer is very important for the performance of protective work. The new protective layer made of high quality concrete reinforced by steel fibers (SFRHSC) is far more profitable than ordinary concrete [12].…”

Rapid-Hardening and High-Strength Steel-Fiber-Reinforced Concrete: Effects of Curing Ages and Strain Rates on Compressive Performance

“…Dalvand et al [32] used zeolite material to partially replace ordinary silicate cement, which could effectively enhance the bond strength in the interfacial transition zone between fine aggregate and cement paste, thus improving the toughness and postpeak behavior. In recent years, a number of researchers have studied the mechanical properties of rapid-hardening HSFRC under quasi-static loading; however, there is limited research on its dynamic mechanical properties under impact loading [29,33]. Previous studies have shown that rapid-hardening HSFRC has good dynamic mechanical properties and its use in repairing bridge deck pavement allows a structure to dissipate more energy at the material level, reduce amplitude and stress, and improve the overall structural damping [33].…”

“…In recent years, a number of researchers have studied the mechanical properties of rapid-hardening HSFRC under quasi-static loading; however, there is limited research on its dynamic mechanical properties under impact loading [29,33]. Previous studies have shown that rapid-hardening HSFRC has good dynamic mechanical properties and its use in repairing bridge deck pavement allows a structure to dissipate more energy at the material level, reduce amplitude and stress, and improve the overall structural damping [33].…”