Numerical and Experimental Investigation of the Effect of Longitudinal Reinforcement Debonding at the Beam-Column Joint

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Authors

1 PhD Student, Structural Engineering, Department of Civil Engineering, Urmia University International Campus, Urmia, Iran

2 Civil Engineering Department, Engineering Faculty, Urmia University, Urmia

10.22034/ceej.2024.61245.2350

Abstract

The separation of longitudinal reinforcement is a well-known method for reducing the plastic strain of longitudinal reinforcement in concrete beams. On the other hand, the use of a sheath around the longitudinal reinforcement has been mostly investigated from the perspective of controlling the buckling behavior of the reinforcement. In this study, the effect of separation with a rubber sheath on the hysteresis behavior of concrete beams, the buckling of longitudinal reinforcement, and the extent of localized damage at the plastic hinge region were investigated. The extent of localized damage was very important in terms of repairability and the likelihood of shear and shear-slip failure at the plastic hinge region. Two experimental specimens, with and without a sheath, were tested under cyclic loading. Subsequently, using the LS-DYNA finite element model, the behavior of the two specimens was examined through numerical analysis. The results indicated that the sheath has no significant effect on the hysteresis behavior and buckling of the reinforcement. However, the same results showed that the sheath significantly prevents the localization of damage, which improves the repairability of the specimen. The results indicated that using a sheath, without significant changes to the current construction method of concrete beams, can significantly reduce the need for repairs in concrete beams during strong earthquakes. Reducing the extent of localized damage (cracks) can also reduce the likelihood of shear and shear-slip failure.

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Journal of Civil and Environmental Engineering

Articles in Press, Accepted Manuscript
Available Online from 31 August 2024

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