Experimental studies of dynamically loaded corrosion-damaged reinforced concrete elements: Fid-Bau Portal

Experimental studies of dynamically loaded corrosion-damaged reinforced concrete elements

Tamrazyan, Ashot / Popov, Dmitriy

In the scientific literature, there is practically no analysis of the effect of corrosion damage on the operation of compressed reinforced concrete elements, especially 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 100x100mm, height of 700mm, to create an off-center compression, extensions were made in the supporting parts with a size of 100x200mm. Local corrosion damage of concrete and reinforcement was created in the manufactured reinforced concrete samples 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 corrosion-damaged reinforced concrete elements under dynamic loading. Based on the strain gauge 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 work of the reinforcement with concrete. The obtained diagrams of deformations of cross-sections, out-of-center compressed corrosion-damaged and undamaged samples based on glued strain gauges on concrete and stretched reinforcement showed that these deformation diagrams fundamentally differ in outline. 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 non-corroded structures according to the parameter Ne-1/r (curvature). The influence of corrosion damage on the nature of destruction of non-centrally compressed elements is established.