Experimental shear tests of reinforced concrete beams with corroded longitudinal reinforcement

Abstract

In this study, shear tests were conducted to investigate the effect of corrosion damage induced in longitudinal reinforcement on the shear resistance mechanisms of reinforced concrete (RC) members without transverse reinforcement. A total of eight RC beam specimens were carefully designed and fabricated, and accelerated corrosion and typical shear tests were conducted considering various anchorage conditions and corrosion rates that were introduced in the longitudinal tension reinforcement as the key test variables. Test results showed that when the tensile reinforcement was not sufficiently anchored at the end regions of the RC members, the shear strengths of the test specimens decreased as the corrosion rate increased. In contrast, when the longitudinal reinforcement was properly anchored using the hook detail, the shear strengths showed a clear trend of increase, even when the longitudinal reinforcement was severely corroded.

An experimental study on the shear capacity of corroded reinforced concrete beams without shear reinforcement

“…With the sufficient anchorage performance, the bond deterioration caused by corrosion cracks in the shear span may lead to tied-arch action with the increasing of shear capacity. Furthermore, it shares the same agreement with the research work conducted by Han et al [13], in which the tension reinforcement was properly anchored using the hook details, the RC beams subjected to less than 5% corrosion degree showed about 40% enhancement in shear resistance capacity due to the transfer mechanism shifting from beam action to tied-arch action, regardless of the reduction in bond performance.…”

“…However, in the case of the beams C3-1 and C3-2 having the target corrosion degree of 3.16% and 3.10%, respectively, the shear strength was increased by approximately 7% (37.5 kN versus 35 kN on average) while in the case of the beams C4-1 and C4-2 the maximum capacity is nearly equal to the result of the control beams in group C0. These results can be explained that the bond stress between steel and concrete increases in the experimental beams having the corrosion degree smaller than 4% regardless of the corrosion crack occurred along the longitudinal rebars that is mentioned in the literature [13,15]. The higher corrosion degree beams C5-1 and C5-2 displayed lower initial stiffness than the other tested beams with no clear shear crack was found in the beam web but the flexural cracks during testing.…”

Multiscale Numerical Simulations of Static Shear and Long-Term Behavior of RC Members Considering Corrosion of Reinforcing Bars

“…In this study, FE analysis was conducted on the shear test of RC beams with corroded tensile reinforcement (Han et al 2020) to verify the rationality of the numerical model introduced in Section 2. Han et al (2020) fabricated eight RC beams using the corrosion degree ( corr ω ) and anchorage detail of tensile reinforcement as key variables. As shown in Fig.…”

“…Meanwhile, Azam (2010), Xue and Seki (2010), and Han et al (2020) experimentally observed that depending on the anchorage details of tensile reinforcement, the shear strength of corroded RC members may increase compared with that of non-corroded RC members. As shown in Fig.…”

“…By contrast, when tensile reinforcement was fully anchored at the end of the member via end-hooks or mechanical devices, the shear strength of the member increased even when splitting cracks emerged because of corrosion. Regarding this phenomenon, Han et al (2020) hypothesized that in RC members with fully anchored tensile reinforcement, the shear strength of the corroded RC member increases because the main shear transfer mechanism changes from beam action to arch action as corrosion progresses. However, an analytical model that can predict the shear behavior of RC members with corroded tensile reinforcement is not available.…”