Effect of Reinforcement on RC Column Using Polyurea and Honeycomb Steel Plate

Abstract

Various methods, such as increasing the cross-section and attaching reinforcements, are employed for repairing and reinforcing old buildings. However, these methods have disadvantages, such as inefficient workability and poor appearance. Additionally, the aging rate of social infrastructure is rapidly increasing; however, the manpower required for its maintenance and reinforcement is decreasing. Therefore, simple maintenance and reinforcement methods are required. This study aimed to verify the effectiveness of repair and reinforcement using polyurea and honeycomb steel plate reinforcement methods, which were developed in response to these industrial and technical requirements. These experiments were carried out on the five different types of specimens considering reinforcement effects: 1) no consideration of reinforcements (control specimen, CC), 2) steel plate (SC), 3) integrated type honeycomb steel plates coated with polyurea (PHC1), 4) unit type honeycomb steel plates coated with polyurea (PHC2) and 5) carbon fiber (CFC). The column experiment focused on how the column’s behavioral characteristics change according to the type of reinforced material, rather than identifying the inherent behavior characteristics of the column. Therefore, in this study, the reinforcement effect of each specimen was investigated based on the non-reinforced specimen. In the experiment, the reinforcing effect on the column test object appears in the order of SC > PHC1 > PHC2 > CFC.