Influence of Both Stirrup Spacing and Anchorage Performance on Residual Strength of Corroded RC Beams

Abstract

In this study, the influences of both stirrup spacing and anchorage performance on the residual strength of corroded RC beams are investigated. With the increase of stirrup spacing, the applied load is easily transferred to the anchorage region, and with the increase of the corrosion ratio of rebar, the mechanism of corroded RC beams shifts from beam action to arch action. In the case of non-uniform corrosion of the main rebar, the maximum deviation ratio of the corrosion ratio of main rebars is over 0.9, and the beam suffers flexural failure due to the yielding of rebars in the extremely corroded region. In the case of uniform corrosion of the main rebars, the maximum deviation ratio of the corrosion ratio of main rebars is below 0.9, and there are two situations. If the bottom portions of the stirrups are sufficient, the applied load is restricted in the support span, and the corroded beam presents a flexural failure mode. On the other hand, if the bottom portions of the stirrups are insufficient, the applied load is transferred to the anchorage, and the corroded beam is inclined to suffer bond failure. Moreover, when the beam suffers bond failure, the residual strength depends on the anchorage performance.

Determination of critical anodic and cathodic areas in corrosion processes of steel reinforcement in concrete

“…In the following numerical parametric study the model is used to investigate the critical combination of the anode/cathode position by employing the principle of maximum entropy production. The parametric study for several different geometric parameters determining the position of the anode and cathode and its area ratio is performed for a multi‐rebar reinforced concrete beam which is a typical application from engineering practice. The study is performed assuming that for the given boundary conditions, oxygen diffusivity and electrical conductivity of concrete, such geometrical relationship between anode and cathode is possible for the selected reinforced concrete element.…”

Modeling corrosion‐induced damage of reinforced concrete elements with multiple‐arranged reinforcement bars

“…Most of numerical models mainly consider only the corrosion process on a single bar. Recent experimental tests under accelerated corrosion conditions of the multi‐rebar concrete specimens indicated a significant influence of the rebar spacing on the development of crack patterns in concrete. Multi‐rebars are present in realistic RC structural elements and it is therefore necessary to investigate whether a model is capable to simulate the corrosion‐induced damage for these cases.…”

“…In the experiments of Dong et al , the influence of stirrups on the corrosion‐induced damage was investigated. The crack patterns obtained for a multi‐rebar case with and without stirrups showed a major effect of the stirrups on the crack propagation.…”

“…Recently a coupled 3D chemo‐hygro‐thermo‐mechanical (CHTM) model for modeling of processes related to the chloride induced corrosion of steel reinforcement in concrete was developed. The model is briefly discussed and subsequently employed in the 3D finite element analysis of reinforced concrete (RC) beams exposed to aggressive environmental conditions, which were recently tested by Dong et al . In the analysis, the corrosion‐induced damage is simulated by accounting for the interaction between several rebars.…”

Lifetime performance prediction of reinforced concrete structures in multi-threat areas

“…The experimental test on RC beams by Dong et al (2011) is selected to validate the applicability of our FE models in cases with multiple embedded bars. In their study, a 240mm 200mm 130mm concrete specimen with three 16mm reinforcement was tested in accelerated conditions.…”