Vol. 17 No. 01 (2027): Journal of Materials & Construction
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JOURNAL OF MATERIALS & CONSTRUCTION

ISSN: 2734-9438

Website: www.jomc.vn

Mechanics-consistent refinement of a shear demand-capacity model for corrosion-damaged reinforced concrete beams

Nguyen Vinh Sang

Keywords:

Corroded RC beam
Shear strength
Demand-capacity model
Effective width
Failure mode

Abstract

A mechanics-consistent refinement of an existing shear demand–capacity model is presented for corrosion-damaged reinforced concrete beams. The original framework is retained, while three implementation issues are addressed: consistent use of mass-loss and cross-sectional-loss corrosion descriptors, explicit coupling of corrosion-damaged effective web width with the stirrup contribution, and a root-based solution of bond–slip compatibility. No strength-calibration parameter is introduced. Shear strength is determined from the first admissible intersection between the nonlinear shear-demand curve and the potential shear-capacity curve, thereby preserving the interaction among flexural response, bond deterioration, crack development, and constituent shear-transfer mechanisms. The model is verified against 20 beams from five experimental programs covering different corrosion schemes and shear-span-to-depth ratios. The mean predicted-to-test shear-strength ratio is 1.009, with a coefficient of variation of 8.5%. The results support the refined formulation as a mechanics-based approach for residual shear-strength assessment of corroded RC beams.

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How to Cite

Nguyen Vinh Sang. (2026). Mechanics-consistent refinement of a shear demand-capacity model for corrosion-damaged reinforced concrete beams. JOURNAL OF MATERIALS & CONSTRUCTION, 17(01). https://doi.org/10.54772/jomc.v17i01.1467

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