## 1 Introduction
[9], and [PERSON] et al. [10] conducted drop weight impact tests to assess the impact resistance of beams composed of steel fiber\(-\)reinforced concrete (SFRC) or ultra\(-\)high\(-\)performance fiber\(-\)reinforced concrete (UHPFRC) as the main body. Their results showed that fiber\(-\)reinforced concrete beams demonstrated better impact resistance compared to non\(-\)fiber\(-\)reinforced concrete beams. [PERSON] et al. [11] strengthened RC beams by using outsourced high\(-\)strength steel wire mesh and high\(-\)performance mortar (HSSWM\(-\)HPM), and then conducted impact performance tests on the reinforced RC beams. The test results showed that the impact resistance and ductility of RC beams significantly improved after being strengthened by HSSWM\(-\)HPM. [PERSON] et al. [12] investigated the effect of the strength of inorganic mineral polymer concrete materials and the reinforcement ratio of BERP rebars on the impact resistance of beams, and the results showed that too much or too little strength of the GPC materials as well as the use of BFRP rebars weakened the impact resistance of the beams. [PERSON] et al. [13] found that shorter steel fibers mixed into concrete, the distribution of steel fibers in the concrete in a way that could be more effective in inhibiting the development of cracks, when the energy used to cause the concrete cracking increases, the cracks can only be further expanded, so that the addition of fiber material to the concrete could enhance its compressive strength as well as toughness. [PERSON] et al. [14] and [PERSON] et al. [15] conducted a numerical simulation and parametric analysis on the model of [PERSON] et al. [16] and studied the effect of different strength grades of concrete and longitudinal steel rebar on the impact resistance of PC beams. It was discovered that as the strength grade of the precast concrete and longitudinal steel rebar increased, the impact resistance of the PC beams increased dramatically. Moreover, adopting a strengthening design with an additional UHPC layer poses several complications during the construction process, such as the need for formwork support, pouring, and formwork removal. [PERSON] et al. [17] conducted the reinforcement and testing of reinforced concrete T\(-\)section beams and performed flexural and flexural shear reinforcements on the test beams, respectively, and the results showed that the strength of the reinforced beams increased about 2.5 times; however, the test beams still had good ductility. Since the use of bonded steel strengthening technology to improve reinforced concrete beams' flexural bearing capacity was proposed by scholars since the middle of the last century ([PERSON] et al. [18]; [PERSON] and [PERSON] [19]; [PERSON] et al. [20]; [PERSON] et al. [21]), it can be inferred that the impact resistance of reinforced concrete beams can also be improved through this technology. The impact resistance of partially precast concrete beams strengthened with bonded steel plates was investigated. This study designs one PC beam without strengthening and three PC beams strengthened with bonded steel plates for drop weight impact tests and residual flexural bearing capacity tests. In this paper, the impact resistance and residual flexural bearing capacity of test beams are examined in relation to the thickness of the pasted steel plate and whether or not the beam is strengthened by U\(-\)shaped steel plate hoops.