Investigation of the effects of corrosion on the residual load-carrying capacity of reinforced concrete columns

Abstract

Corrosion of reinforcement is the principal cause of the deterioration of reinforced concrete (RC) columns. Corrosion may affect the residual strength of an RC column in several ways such as section loss of reinforcement, reduction in the strength of corroded reinforcement, reduction in the concrete cross-section due to corrosion-induced cracking and spalling, and loss of bond strength. In this paper, the effect of reinforcement corrosion and loss of concrete cover on the structural behavior of RC columns is quantified by developing momentaxial load (M-P) interaction diagrams based on TCVN 5574-2018 standard. The obtained results of this study show that for deteriorated columns, the amount of strength loss depends on the location and amount of corrosion of steel bars. Besides, the present investigation is the basis for the repair and strengthening of RC columns.

Keywords: RC column; corrosion; interaction diagrams; strenthening.