Measurements of earth movements during the past earthquakes indicate that the vertical acceleration of an earthquake can reach the magnitude of earthquake acceleration in a horizontal direction, or even may in some cases exceed these accelerations. The present study examines the effect of the vertical component of the earthquake on the concrete of the RC bridges piers (columns). The results of the analyzes on the bridge column were performed once, taking into account the effect of the vertical component and again, without considering the effect of the vertical component under the Abaqus software And the results of the analysis were compared in two ways. The results show that the displacement of the pivot axial force demand is significantly exacerbated by the vertical movement of the earthquake. Also, in recent earthquakes (lamaprieta, Northridge, Kobe), shear damage and shear failure of the columns were common, all indicating a significant increase in the axial force in the reinforced concrete columns under the influence of the vertical movement of the ground, which in effect meant the slipping capacity of the columns was reduced. [1-7]