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Title: Coupled Effect of Temperature and Strain Rate on Mechanical Properties of Steel Fiber-Reinforced Concrete

Author(s): Ruiyuan Huang, Shichao Li, Long Meng, Dong Jiang, Ping Li

Publication: IJCSM

Volume: 14

Issue:

Appears on pages(s):

Keywords: steel fiber-reinforced concrete (SFRC), high temperature, high strain rate, split Hopkinson pressure bar (SHPB), ultimate compressive strength

DOI: 10.1186/s40069-020-00423-y

Date: 9/30/2020

Abstract:
The dynamic mechanical properties of steel fiber-reinforced concrete (SFRC) under high temperature and high strain rate were studied using a split Hopkinson pressure bar (SHPB) of 74 mm in diameter. As it is difficult to achieve con-stant strain rate loading in SHPB experiments with high temperature and high strain rate, this paper first presents a method for determining the strain rate under non-constant strain rate loading conditions. This method is proposed to deal with experimental data under non-constant strain rate loading conditions. Then, the influences of temperature on the ultimate compressive strength, peak strain, and failure modes of SFRC under different strain rates were ana-lyzed and the results show that SFRC has a strain rate hardening effect. This paper also points out that there is a strain rate threshold for SFRC. If the strain rate is less than the strain rate threshold, there is a temperature softening effect. Conversely, if the strain rate is greater than the strain rate threshold, there is a temperature hardening effect. Finally, the relationship between the ultimate compressive strength and fiber volume fraction, strain rate, and temperature is presented and the prediction results are consistent with the experimental data.