Open Access Open Access  Restricted Access Subscription Access

Shear and Flexural Performance of Circular Reinforced Concrete Columns Confined with Carbon Fiber Reinforced Polymer (CFRP) Grids and Hybrid Fiber Reinforcement

Ajay Pratap Singh, Abhishek .

Abstract


Circular reinforced concrete (RC) columns are critical structural elements, especially in infrastructure demanding high durability and resistance to complex loading scenarios. This research explores the efficacy of an advanced composite reinforcement system, integrating Carbon Fiber Reinforced Polymer (CFRP) grids as partial or full replacement for conventional steel stirrups, alongside the incorporation of hybrid fibers (a combination of steel and polypropylene fibers) within the concrete matrix. The study aims to evaluate the combined effects of these materials on both the shear strength and flexural ductility of circular RC columns. An experimental investigation was planned, involving the casting and testing of twelve circular column specimens. The primary variables included the configuration of transverse reinforcement (conventional steel stirrups, CFRP grids, and a combination), and the volume fraction of hybrid fibers. Specimens were designed to be subjected to combined axial load and lateral cyclic loading to simulate seismic actions, inducing concurrent shear and flexural demands. Key performance metrics such as load-carrying capacity, deformation characteristics, energy dissipation, stiffness degradation, and failure modes were to be systematically analyzed. This paper outlines the proposed experimental framework and discusses the anticipated improvements in structural performance, focusing on enhanced ductility, crack control, and overall resilience attributable to the synergistic action of CFRP grids and hybrid fiber reinforcement.


Full Text:

PDF

References


● Banthia, N., & Sappakittipakorn, M. (2007). Toughness enhancement in steel fiber reinforced concrete through fiber hybridization. Cement and Concrete Research, 37(9), 1366-1372.

● Chaallal, O., Mofidi, A., Benmokrane, B., & Neale, K. (2011). Carbon FRP-confined circular concrete columns: Experimental and analytical investigation of size effect. Journal of Composites for Construction, 15(3), 373-384.

● El-Gamal, S., Al-Salloum, Y., Almusallam, T., & Alsayed, S. (2005). Behavior of RC beams strengthened with CFRP bars as near-surface mounted reinforcement. Journal of Composites for Construction, 9(6), 501-509.

● Mander, J. B., Priestley, M. J. N., & Park, R. (1988). Theoretical stress-strain model for confined concrete. Journal of Structural Engineering, 114(8), 1804-1826.

● Morsy, A. M., & El-Tony, M. E. (2020). Axial behavior of circular concrete columns confined with CFRP grids. Structures, 27, 1289-1300.

● Rousakis, T. C., Kivotidis, D., & Vryzimidis, V. (2019). Carbon-FRP rope-confined circular concrete columns subjected to cyclic axial compressive loading. Composites Part B: Engineering, 176, 107239.

● Sivakumar, A., & Santhanam, M. (2007). Mechanical properties of high strength concrete reinforced with metallic and non-metallic fibres. Cement and Concrete Composites, 29(8), 603-608.


Refbacks

  • There are currently no refbacks.