Experimental Study on the Influence on the Load-Carrying Capacity and Deformation Performance of RC Beams Due to Artificial Deterioration

抄録

To understand the effect of deterioration on the load-carrying capacity and deformation performance of reinforced concrete members, multiple model beams with various types of artificial deterioration were developed, such as removal of the concrete cover and stirrup rebar. Then, static-loading tests were performed on the model beams to investigate their mechanical behavior in terms of the load–deflection relationship. The result revealed that the moderately deteriorated model beams whose concrete covers were removed exhibited similar load–deflection-related patterns before their yield deflection values compared with the sound model beam. On the other hand, the load-carrying capacity and deformation performance of the model beams with moderate deteriorations after the yield deflection values were found to be proportional to the removal intervals of the concrete cover. For the model beams with severe deterioration whose concrete cover and stirrup rebar were removed, the loadcarrying capacity and deformation performance were weaker than the other model beams. The damage to the concrete cover became noticeable after their yielding. However, damage to the rebars was suggested to affect the bending strength and rigidity of structures and members even before they yielded.