Confinement efficiency of CFRP, TRM, and prefabricated composite tubes for low-strength circular RC columns
Bulletin of Earthquake Engineering, 2026 (SCI-Expanded, Scopus)
- Yayın Türü: Makale / Tam Makale
- Basım Tarihi: 2026
- Doi Numarası: 10.1007/s10518-026-02627-1
- Dergi Adı: Bulletin of Earthquake Engineering
- Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Compendex, Geobase, INSPEC, Academic Search Ultimate (EBSCO), Natural Science Collection (ProQuest), Earth, Atmospheric, & Aquatic Science Collection (ProQuest), Materials Science & Engineering Collection (ProQuest), Technology Collection (ProQuest)
- Anahtar Kelimeler: ABAQUS, CFRP, Prefabricated FRP tubes, Retrofitting, TRM
- Ankara Üniversitesi Adresli: Evet
Özet
The deterioration of aging reinforced concrete (RC) members, especially those constructed with low-strength concrete, necessitates effective strengthening strategies. This study investigates the axial behavior of circular RC columns with a compressive strength of 15 MPa through experimental and numerical analyses. A total of ten specimens, including one reference and nine strengthened columns, were tested under monotonic axial loading. Strengthening techniques included CTRM, GTRM, CFRP wraps with different layer configurations, and prefabricated composite FRP tubes. All confinement methods significantly improved the load-carrying capacity and deformation behavior by restricting lateral expansion of the concrete core. The three-layer CFRP configuration achieved the highest capacity, reaching 1355.46 kN, corresponding to a 5.64-fold increase compared to the reference specimen. In contrast, composite tube systems exhibited superior deformation capacity and energy absorption due to the absence of lap-splice deficiencies. Numerical models developed in ABAQUS using the Concrete Damaged Plasticity approach showed good agreement with experimental results, with prediction errors below 13.11%. Overall, CFRP systems provided the highest strength enhancement, whereas composite tubes offered more ductile and stable behavior. For applications requiring enhanced energy absorption, prefabricated composite tubes are recommended.