Quasi-static experiments on columns and frame elements are of great importance in the study of earthquake behavior. One of the most important problems encountered during the experimental studies on the columns and frame elements under earthquake load was that the axial load on the columns could not be kept constant. The post-tensioning system used to apply an axial load to the columns has become a frequently preferred method in terms of ease of application and economic efficiency. In this method, the axial force is applied to the columns by post-tensioning the steel cables. However, as the horizontal displacement increases, the cables deviate from the vertical plane and form horizontal and vertical load components on the test element. This horizontal component is in the opposite direction of the applied horizontal force and affects the results of the experimental study. In this study, a vertical loading system has been developed which is free of horizontal movement with low friction linear slides and allows the axial load to remain constant on the axis to which it is applied. The developed system was tested on a single-story and single-span reinforced concrete frame in full size. As a result of experimental studies, it was seen that the axial load remained constant at the vertical axis of the column throughout the experiments.