## 1 Introduction  
Reinforced concrete (RC) structures are the most commonly used structural systems. With the increase in their service lives, a large number of existing structures urgently need to be repaired due to structural deterioration associated with the corrosion of the internal steel reinforcement and defects in the concrete. Fiber-reinforced polymer (FRP) is widely used in structural reinforcement because of its light weight, high strength, corrosion resistance capability, and high elasticity [1; 2; 3; 4; 5; 6; 7; 8; 9]. The in-site wet lay-up process is often used in practice to strengthen the RC columns due to its simplicity and rapidity with respect to construction. The previous investigations prove that FRP constrains the lateral deformation of concrete, which results in three-dimensional compressive stresses in the core concrete and, subsequently, enhanced strength and ductility of FRP-confined concrete (FCC) are achieved [10; 11; 12; 13; 14; 15; 16; 17; 18; 19; 20; 21]. FRP has also been adopted for the seismic strengthening of RC structures [22; 23]. In association with FCC, a number of new forms of hybrid columns have also been recently developed for structures with various functions [24; 25; 26; 27; 28; 29]. The responses of FCC under various types of loadings are the foundation for the behavior of the hybrid columns associated with FCC. Over the past two decades, most scholars have been devoted to understanding the quasi-static compression behavior of FCC, such as the constitutive model, the derivation of the ultimate stress and the ultimate strain, the effect of partial confinement, the effect of the concrete strength grade, the effect of the concrete aggregate, the type of FRP, and the amount of the confinement ratio on the reinforcement effectiveness (e.g., [8; 9; 10; 11; 12; 13; 14; 15; 16; 17; 18; 19; 20; 21; 22]). However, there are few studies on the impact resistance of FCC [30; 31; 32], which, in particular, focused on normal strength concrete (i.e., with a strength of less than 50 MPa, abbreviated as 'NSC' for ease of reference in the remainder of the text). If FCC is used in special construction (e.g., military structures, protective structures, bridges, wharfs, offshore platforms, and chemical plants) without considering dynamic actions, such as impacts and explosions, serious consequences may occur. Note that the vehicle impact and hard impact loading are generally in a strain rate (i.e., the differential of the strain with respect to time) range of \(10^{-3}\) to \(10^{2}\)[32]. On the other hand, with an increase in the height and the span of new construction and an increase in the demand for protective structures, the use of FRP-confined high-strength concrete in new structures is becoming increasingly attractive. However, the relevant research has yet to be conducted. Therefore, it is very important to study the impact resistance of FRP-confined high-strength concrete (abbreviated as 'FCHC' in the rest of the current article for ease of reference) for a reliable design of structures with FCHC. FCC consists of the FRP and the concrete. For the impact resistance of unconfined concrete (including concrete with various aggregates (e.g., [33; 34; 35; 36; 37; 38; 39; 40; 41; 42; 43]) and fiber-reinforced concrete (e.g., [44; 45; 46])), it was proven that the strain rate effect of concrete is evident. The internal fiber reinforcement and the external confinement have been proven to be efficient in enhancing the impact resistance of concrete. Confined concrete is generally divided into active confined concrete (e.g., concrete-filled steel tubes) and passive confined concrete (e.g., FCC). Experimental results show that the strain rate sensitivity of the steel tube confined concrete is low, although the steel tube confined concrete has a better impact resistance, plastic deformation, and energy dissipation capacity [47; 48; 49; 50; 51]. For the impact resistance of FCC, the existing investigations are mainly on the effects of the FRP thickness, strain rates, and impact durations.