## 1 Introduction
It is important to study the strength and deformation characteristics of concrete or fiber concrete under dynamic loads. According to the existing research results [4; 15], the strain rate of a concrete structure under different loads can be further divided into the following types: creep load (10\({}^{-8}\)-10\({}^{-6}\) s\({}^{-1}\)), static load (10\({}^{-6}\)-10\({}^{-5}\) s\({}^{-1}\)), vehicle load (10\({}^{-5}\)-10\({}^{-4}\) s\({}^{-1}\)), seismic load (10\({}^{-4}\)-10\({}^{-2}\) s\({}^{-1}\)), impact load (10\({}^{-2}\)-10\({}^{2}\) s\({}^{-1}\)), and explosion and high-speed collision load (10\({}^{2}\)-10\({}^{4}\) s\({}^{-1}\)). [PERSON] et al. [16] first carried out the compression experiments of concrete under static load (with a strain rate of approximately 8 \(\times\) 10\({}^{-6}\) s\({}^{-1}\)) and dynamic load (with a strain rate of \(\sim\)2 \(\times\) 10\({}^{-4}\) s\({}^{-1}\)) and found that there was a strain rate sensitivity for the compressive strength of concrete. In 1917, many scholars carried out a variety of dynamic experimental studies on the mechanical properties of concrete and FRC. [PERSON] et al. [17] used the drop hammer experimental system to study the dynamic mechanical properties of coir FRC and found that the impact index of fiber concrete increased with the increase of fiber length and content. [PERSON] et al. [18] conducted three-point bending tests on notched beams of steel FRC under a large range of loading rates by using both a servo-hydraulic machine (with a loading rate of \(\sim\)10\({}^{-3}\)-1 mm/s) and a drop-weight impact device (with a loading rate of approximately 10\({}^{2}\)-10\({}^{3}\) mm/s). The experimental results showed that the rupture energy and the peak load increased with increasing loading rate, and the growth values at a low loading rate were smaller than those at a high loading rate. This was due to the viscous effects of free water at lower rates and the inertia effect and greater fiber pullout energy at high rates. [PERSON] et al. [1] studied the mechanical properties of basalt fiber-reinforced recycled aggregate under different replacement ratios and contents of basalt fiber (e.g., concrete failure modes,compressive strength, tensile strength, elastic modulus, Poisson's ratio, and ultimate strain under static conditions) and some mechanical properties under cyclic loading and unloading. The experimental results showed that the basalt fiber enhanced the mechanical properties of recycled aggregate concrete. Currently, the most commonly used fibers in concrete are steel fibers, which have significantly improved the tensile properties of concrete. However, the addition of steel fiber not only improves the tensile strength, but also increases the weight of the concrete structure [19]. The development of polymer materials science has led to the fabrication of the newly developed PVA, which is a kind of synthetic fiber with a low price, high strength, and high elastic modulus. It has good hydrophilicity and a high bonding strength with cementitious material. This not only effectively inhibits early cracks in the concrete, but also improves the strength, toughness, and durability of the concrete [20]. At present, the enhancing properties of PVA have been confirmed in the application of Engineered Cementitious Composite (ECC) concrete, which does not contain coarse aggregate [21; 22; 23]. However, due to the large content of PVA in concrete (2%) without coarse aggregate, the cost of concrete is so high that the application is still limited to the key parts of structures subjected to large forces in engineering. This is not conducive to large-scale promotion of PVA fiber concrete. Now, the available dynamic characteristics of PVA FRC with coarse aggregate also concentrate on high strain rates, such as impact loads, explosions, and high-speed collision loads. There are still few studies on the dynamic characteristics at the strain rate of seismic loads for fine PVA FRC that are suitable for testing the strength of an engineering structure.