Abstract
In the present work, it is proposed to include in the theoretical curves of moment-curvature (m- φ) the effect of corrosion by obtaining the decrease in the area of longitudinal reinforcing steel. The corrosion depth will be obtained from the crack width and corrosion length observed in the cover concrete. With the depth of corrosion, the area of steel that is lost will be obtained and this modification will be incorporated into the theoretical procedure to elaborate the m- φ curves. The forces of the steel will be obtained from an elastoplastic model with curved hardening and the forces of the concrete with a model that considers the effect of confinement.
Highlights
The modelling procedures of the plastic hinge of the elements of the reinforced concrete structures consider hypotheses of the behavior of the materials different from the hypotheses used for the design of the element, one of these hypotheses is based on modelling the stress-Strain curves of materials considering the effects of confinement and material deterioration, but current regulations only consider concrete deterioration due to cyclical loads and with these hypotheses, the moment-curvature diagrams that define the plastic hinge are constructed
In research carried out [55] there is a notable difference in the crack width of the different sides of the section of specimens exposed to marine environments, this mainly due to the fact that exposure to the aggressive agents is different in the structural elements depending on their orientation, this can be seen in Fig. 12, the concrete elements present greater corrosion damage on one of the faces
We can observe that the ultimate curvature increases as the crack width increases, despite the fact that the percentage of steel loss per affected rod is of the order of 90% (See Table II) for larger crack widths
Summary
The modelling procedures of the plastic hinge of the elements of the reinforced concrete structures consider hypotheses of the behavior of the materials different from the hypotheses used for the design of the element, one of these hypotheses is based on modelling the stress-Strain curves of materials considering the effects of confinement and material deterioration, but current regulations only consider concrete deterioration due to cyclical loads and with these hypotheses, the moment-curvature diagrams that define the plastic hinge are constructed These hypotheses can be used in cases where it is desired to evaluate a concrete structure or perform a non-linear analysis, they do not reflect the effect of the deterioration that the structure element may have due to carbonation of the concrete, due to loss of the section, due to cracking or corrosion of the steel of the reinforcing steel, which is the main cause of the deterioration of reinforced concrete structures, among the main aggressive agents are chloride ions, which according to the literature are considered the most aggressive [1]-[12], the sulfate ions are considered as aggressive agents, which are present in wastewater, contaminated soils, groundwater, or industrial environments, so their effect on the corrosion of reinforcing steel and object has been of great interest. The construction of the stress-strain curve of the concrete is done following the proposal of Mander [47], the stress-strain curve of steel with the values proposed by Mendoza [48] and in a first proposal, considering the loss of steel due to corrosion according to the criteria of Castonera [49]
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