Lateral behavior of brittle shear-failure RC columns retrofitted with ECC jackets: effects of strain-hardening and axial load
Journal of Building Pathology and Rehabilitation, cilt.11, sa.4, 2026 (Scopus)
- Yayın Türü: Makale / Tam Makale
- Cilt numarası: 11 Sayı: 4
- Basım Tarihi: 2026
- Doi Numarası: 10.1007/s41024-026-00897-5
- Dergi Adı: Journal of Building Pathology and Rehabilitation
- Derginin Tarandığı İndeksler: Scopus
- Anahtar Kelimeler: Column jacketing, Concrete damage plasticity, Constitutive model, Ductility, Engineered cementitious composites, Reinforced concrete column, Shear failure
- Orta Doğu Teknik Üniversitesi Adresli: Evet
Özet
This study presents a numerical investigation on the nonlinear behavior of brittle reinforced concrete (RC) columns retrofitted with engineered cementitious composite (ECC) jackets exhibiting varying levels of strain-hardening capacity. Constitutive relations based on the concrete damage plasticity model are employed for both normal concrete and ECC, with parameter sets proposed for ECC to represent different tensile strain-hardening capacities associated with uncoated and oil-coated PVA fibers. Validation against benchmark RC columns tested under reversed cyclic loading—exhibiting brittle failure and ductile yielding under varying axial loads—demonstrates the model’s ability to reproduce backbone load–displacement responses and damage patterns with high fidelity. Building on this validation, systematic parametric analyses are conducted to investigate the influence of low, medium, and high axial load levels on the ECC-jacketed columns subjected to monotonic loading. Results show that ECC jacketing not only enhances strength, monotonic deformation capacity and stiffness but also shifts the response from brittle shear toward more ductile behavior, even under high axial load demands. Comparative findings further reveal that the 3.5% strain-hardening ECC case delivers superior ductility and monotonic plastic dissipation, whereas the 1% case offers a more economical strengthening solution, particularly under low to medium axial loads. The proposed modeling framework integrates strain-hardening characteristics and axial load effects, providing useful insight into rehabilitation of shear-deficient RC columns within the investigated parameter range.