Experimental studies of non-centrally compressed corrosion-damaged reinforced concrete elements under dynamic loading

Abstract

In the scientific literature, there is practically no analysis of the effect of corrosion damage on the operation of compressed reinforced concrete elements, especially on the stress-strain state of such structures under dynamic loading. For experimental studies, 37 reinforced concrete samples were made – columns of square cross-section with dimensions of 100×100mm, height of 700mm, extensions of 100×200mm were made in the supporting parts to create off-center compression. In the manufactured samples of reinforced concrete, local corrosion damage of concrete and reinforcement was created for accelerated corrosion of elements, a concentrated solution (37%) of hydrochloric acid (HCl) was used as an aggressor. The article describes experimental studies of non-centrally compressed reinforced concrete elements damaged by corrosion under dynamic loading. According to the load cell readings, it was recorded that corrosion damage leads to a decrease in the height of the compressed concrete zone, due to a decrease in the cross-section of the stretched reinforcement, as well as the lack of joint reinforcement with concrete. The obtained deformation diagrams of transverse, non-centrally compressed, corroded and undamaged samples based on glued strain gages on concrete and stretched reinforcement showed that these deformation diagrams fundamentally differ in shape. The deformations of reinforcement and concrete obtained as a result of a full-scale study made it possible to assess the stress-strain state of damaged and uncorroded structures according to the parameter Ne-1/r (curvature). The effect of corrosion damage on the nature of destruction of non-centrally compressed elements has been established.