Axial Load Behavior of RC Columns Retrofitted with SFRC Plates: Experimental and Numerical Study
10th Turkish Conference on Earthquake Engineering, TCEE 2025, İstanbul, Türkiye, 8 - 10 Ekim 2025, cilt.854 LNCE, ss.179-197, (Tam Metin Bildiri)
- Yayın Türü: Bildiri / Tam Metin Bildiri
- Cilt numarası: 854 LNCE
- Doi Numarası: 10.1007/978-3-032-23614-2_10
- Basıldığı Şehir: İstanbul
- Basıldığı Ülke: Türkiye
- Sayfa Sayıları: ss.179-197
- Anahtar Kelimeler: Energy dissipation capacity, FEA retrofitting, RC column, SFRC plate
- Gazi Üniversitesi Adresli: Evet
Özet
Earthquakes significantly reduce the axial bearing capacity of reinforced concrete (RC) columns, compromising the structural stability of buildings. This study presents an innovative retrofitting approach to restore and enhance the performance of RC columns with sparsely spaced stirrups by using steel-fiber-reinforced concrete (SFRC) thin plates. Seven RC columns, scaled to 1/3 of their original dimensions, with a 20 MPa compressive strength, a cross-section of 150 × 100 mm, and a height of 600 mm, were tested. Among these, one column served as a control specimen, while the remaining six were retrofitted with 10 mm thick SFRC plates containing steel fiber volume fractions of 0 and 1%. The retrofitting was applied in three configurations: short sides, long sides, and fully covering the column surfaces. Structural performance was evaluated using four Linear Variable Differential Transformers (LVDTs). Two were positioned at mid-height to measure displacements for compressive stress–strain analysis, while the other two were placed at the base to record load–displacement behavior. The experimental results have been demonstrated significant improvements in structural performance due to the SFRC plates. Maximum recorded enhancements include increases in load-bearing capacity (60%), compressive stress (60%), energy dissipation capacity (EDC) (286%), initial stiffness (107%), and ductility (81%). Furthermore, finite element analysis (FEA) performed using ANSYS Workbench 2024 validated these findings. The FEA provided additional insights and comparative analysis under identical testing conditions, further supporting the efficacy of the proposed retrofitting method.