Hybrid CFRP-BFRP Rebars for Prestress Concrete Slabs: Abaqus Analysis and Experimental Validation

Abstract

This study utilizes Abaqus finite element software to analyze concrete slabs reinforced with a novel hybrid of Carbon Fiber Reinforced  Polymers (CFRP) and Basalt Fiber Reinforced Polymers (BFRP) rebars known as CBRP rebars. The investigation focuses on assessing the  structural performance of these slabs under varying prestressing levels (PL) and FRP reduction factors (FR), along with the prestress  index level (PI). The study defines the FR factor as the reduction in the transverse reinforcement area of FRP compared to the control  slab. The PI is the ratio of prestressed CBRP rebars to the total FRP reinforcement in the transverse direction, aiming to determine a lower  FRP reduction factor without compromising the FRP slabs' design requirements. Three FR values (0.45, 0.37, and 0.29) are  considered, with the CBRP tendon tensioned at 35% and 50% of the ultimate strength, including 0.5 and 0.6 of the PI, for validation  against experimental test data. The numerical analysis incorporates advanced finite element modeling techniques, integrating material  properties, load conditions, and structural parameters to detail the behavior of CBRreinforced concrete slabs. Various loading scenarios  are simulated to evaluate the performance of CBRP rebars under diverse conditions. Comparison with experimental data validates the  hybrid reinforcement approach's reliability. The study's findings contribute significantly to understanding the structural performance of  concrete slabs reinforced with CBRP rebars. The hybridization of CFRP and BFRP rebars offers a promising alternative for enhancing  concrete structure strength while reducing the carbon footprint associated with traditional reinforcement materials. The versatility of  CBRP rebars allows customization based on specific structural requirements. Based on the Abaqus numerical analysis and its alignment  with experimental data, the study recommends optimizing the CFRP-BFRP ratio to meet structural demands, evaluating long-term  performance, and exploring environmental benefits associated with sustainable reinforcement materials. This research advances  knowledge in the hybrid fiber-reinforced polymers field, offering insights for engineers and researchers seeking innovative solutions for  concrete structure enhancement using Abaqus as a powerful analytical tool.