摘要：Several factors such as design and calculation errors, lack of proper implementation, change in application of structures, damage as a result of random loads, exhaustion and corrosion, and natural disasters such as earthquakes, fires, and environmental conditions lead to decreased durability. In such cases, the structure requires rehabilitation and restoration in order to achieve the original performance. Carbon Fiber Reinforced Polymer (CFRP) is one of modern materials to strengthen structures. In this study, the impact of CFRP on strengthening short circular-shaped steel columns with initial horizontal and vertical deficient were examined. Ten circular-shaped steel columns with different deficiency length and width were studied by ABAQUS at two heights (240 mm and 300 mm). Also, Riks non-linear analysis method was utilized to observe plastic zone buckling after post buckling. The results show that deficient leads to reduced bearing capacity of steel columns and the impact of horizontal deficient is higher than vertical one. Using CFRP for strengthening deficient short circular-shaped steel columns shows that CFRP yields appropriate impact on bearing capacity rise, reduced stress in the damage location, and prevented deformation caused by deficiency
