Coupled Effect of Temperature and Strain Rate on Mechanical Properties of Steel Fiber-Reinforced Concrete
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International Journal of Concrete Structures and Materials Open Access
RESEARCH
Coupled Effect of Temperature and Strain Rate on Mechanical Properties of Steel Fiber‑Reinforced Concrete Ruiyuan Huang1* , Shichao Li2, Long Meng3, Dong Jiang4 and Ping Li5
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 constant 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 analyzed 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. Keywords: steel fiber-reinforced concrete (SFRC), high temperature, high strain rate, split Hopkinson pressure bar (SHPB), ultimate compressive strength 1 Introduction Steel fiber can increase the energy adsorption, crack resistance and impact strength of concrete significantly (Song and Hwang 2004; Yang et al. 2017; Holschemacher et al. 2010; Li et al. 2017a, b; Wang et al. 2008; El-Dieb 2009). It has been widely used in military and civilian applications such as pavements, tunnels, bridges and fortifications. These engineering structures may be exposed to fire and explosions in accidents and terrorist attacks (Chen et al. 2015; Liu and Xu 2013). Under these conditions, the circumstances surrounding the Steel fiberreinforced concrete (SFRC) are very complex given the combined effect of the temperature field and dynamic *Correspondence: [email protected] 1 Assistant Professor in Nanjing University of Science and Technology, Jiangsu 210094, China Full list of author information is available at the end of the article Journal information: ISSN 1976-0485 / eISSN 2234-1315
load. Therefore, it is of importance to conduct a study on the coupled effect of temperature and strain rate on the mechanical properties of SFRC. Currently, the research is mainly focused on the mechanical properties of concrete after exposing it to high temperatures. Tai et al. (2011) investigated the stress–strain relationship in reactive powder concrete (RPC) under quasi-static loading after exposure to an elevated temperature, and the
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