Mechanical model for the shear strength prediction of corrosion-damaged reinforced concrete slender and non slender beams. (15th November 2021)

• Record Type: Journal Article
• Authors: Cladera, Antoni; Marí, Antonio; Ribas, Carlos
• Is Part Of: Engineering structures. Volume 247(2021)
• Publication Date: 2021-11-15
• Subjects: Shear strength -- Reinforced concrete -- Stirrup -- Corrosion -- Deterioration -- Mechanical model -- Slender beams -- Short beams; Structural engineering -- Periodicals; Structural analysis (Engineering) -- Periodicals; Construction, Technique de la -- Périodiques; Génie parasismique -- Périodiques; Pression du vent -- Périodiques; Earthquake engineering; Structural engineering; Wind-pressure; Periodicals; 624.105
• DOI: 10.1016/j.engstruct.2021.113163
• Languages: English
• ISSNs: 0141-0296

Abstract

Highlights: Stirrups, small in diameter and with low concrete cover, are susceptible to corrosion. Compression Chord Capacity Model extended to predict the shear strength of corrosion-damaged RC beams. The extension considers corrosion of stirrups and longitudinal bars and concrete spalling. A database including 146 tests of slender and non slender beams used for validation. Safety and scatter of the results is comparable between damaged and undamaged beams. Abstract: Steel corrosion in RC structures leads to a reduced reinforcement area, changes in steel mechanical properties, cracking and, eventually, concrete cover spalling, among other phenomena. Stirrups are generally small in diameter and, given their small concrete cover, they are more susceptible to corrosion than longitudinal reinforcement. Hence their corrosion significantly affects shear strength. Most existing models that deal with reduction in the shear strength of corrosion-damaged reinforced concrete (RC) structures are empirical; that is, they have been numerically fitted to test results. In this context, conceptual models based on structural mechanics principles and verified for corrosion-damaged members are still needed. In this paper, the Compression Chord Capacity Model (CCCM), a shear mechanical model previously derived by the authors, is adapted to predict the shear strength of corrosion-damaged RC beams. For this purpose, the model parameters that can be affected by steel corrosion in RC beams were identified and modified accordingly. CCCM predictions were compared to the experimental results of 146 slender and non slender beams failing in shear, in which stirrups and/or longitudinal reinforcement was subjected to corrosion. The CCCM achieved very satisfactory shear strength predictions when reductions in reinforcement areas and web width were taken into account, with a mean value of the Vtest /Vpred ratio equaling 1.19 and a 19.5% coefficient of variation. Finally, a parametric analysis was performed to show the predicted reductions in shear strength according to the CCCM compared to the experimental results of some especially relevant tests.