Resistance of corroded RC beams: Extending fib Model Code 2010 models

Abstract

The residual resistance of corroded reinforced concrete members depends on steel and concrete cross section loss and deterioration of material properties for steel, concrete, and bond. The paper considers these phenomena in models for resistance calculations, starting from the cross section and stress field models in Model Code 2010. The aim of this study is to develop models proposed by Coronelli et al., using a recently proposed approach by Blomfors et al. to model bond of corroded reinforcement based on the Model Code 2010 bond stress-slip relation. Flexure, shear, and anchorage resistance of corroded reinforced concrete beams are studied. The verification is carried out by comparison with tests on corroded beams with different shear span-to-depth ratios. The bond deterioration leads to changes in the inclination of the stress fields in B regions and anchorage failures. The reduced resistance and the changes of the failure modes caused by the deterioration phenomena are captured by the modeling approach.

The combined effect of load and corrosion on the flexural performance of recycled aggregate concrete beams

“…The reason may be that for the corroded beams with same load level applied, the corrosion level of steel bars tends to increase with aggregate replacement ratio (see Table 3), while Fernandez et al, 31 and Yang et al 32,33 found that the bond strength between steel bars and surrounding recycled aggregate concrete decreased with the increasing corrosion level of steel bars. Coronelli, 34 Coronelli et al, 35 Blomfors et al, 36 and Zandi et al 37 pointed out that corrosion physically reduced the cross‐section of the transverse and longitudinal reinforcement, cracked the concrete cover and affected the bond strength between the reinforcement and concrete. When the load level is small (not greater than 0.2), with the increase of aggregate replacement ratio, the decreased number of bending cracks due to the degradation of bond performance between steel bars and surrounding concrete is less than the increased number of bending cracks due to the aggregate replacement ratio increases.…”

Toward the definition of equivalent damage parameters for the assessment of corroded RC structures

“…strength of corroded RC members 3 and validated them against experimental data. However, for the practical applications of assessment of existing RC structures, important issues need to be addressed.…”

Behavior of RC stepped beams with different configurations: An experimental and numerical study

“…Many researchers studied behavior of ordinary RC beams 13–16 on the contrary, the studied of the stepped beams are very rare. The SBs are necessary members, in case of the floors with different levels in one span.…”