Due to the pivotal role of the columns in the stability of a structure, the behavior of these members should be well known in various loading conditions, especially under earthquake loads. If a column of a structure does not show the expected performance under a loading condition, strengthening or retrofitting of the column is inevitable in order to ensure the safety of the residences. One of the new methods for strengthening of reinforced concrete structures is the use of FRP composites. Considering that the knowledge of strengthening reinforced concrete structures with FRP composites is at the preliminary stages, there is an essential need for extensive research in various fields of this knowledge. Since strengthening and retrofitting are usually performed for earthquake loads, and considering the important role of columns in structures, it seems that investigating the behavior of reinforced concrete columns strengthened with FRP composites is a useful and practical topic in the field of strengthening. In this research, a new experiment was designed to simulate a part of earthquake phenomenon and examine the effects of its cyclic loading on reinforced concrete columns, and then a device for this experiment was devised and constructed. Afterwards, 12 square reinforced concrete columns with cross sections of 125×125 mm were tested; 6 of which had a height of 600 mm ( ) and 6 columns with a height of 1000 mm ( ). The specimens were non-strengthened, strengthened with longitudinal FRP sheets using GM method (EBROG technique), and strengthened with FRP full wrap. The columns were tested under axial compressive loading with 90 mm eccentricity in both monotonic and reversed cyclic patterns to investigate the effect of cyclic loads on the specimens.Experimentalresults revealed that cyclic loading reduced load-carrying capacity and ductility of each column compared to a column with the same properties but under monotonic loading. The maximum reduction of load-carrying capacity and ductility are 10% and 32%, and are related to strengthened specimen with longitudinal FRP sheets using EBROG technique. Also, by comparing the extracted parameters from the data of the tests, it was revealed that using longitudinal FRP sheets with EBROG technique to strengthen columns under axial load with high eccentricity leads to a significant increase in load-carrying capacity (more than 64%), while using FRP wraps has small effect; On the other hand, when the goal is to increase ductility and there is no need to increase load-carrying capacity, using FRP wraps is more suitable to retrofit a column under axial load with high eccentricity.