DESIGN APPROACH FOR CONCRETE BEAMS PRESTRESSED WITH HIGH-STRENGTH BASALT FIBER-REINFORCED POLYMER TENDONS

摘要

Use of basalt fiber-reinforced polymer (BFRP) rebars has lately been introduced as an effective means for replacement of the conventional steel reinforcement in concrete structures owing to their relatively superior physical and mechanical properties. In the present study, BFRP-prestressed concrete (BFRP-PSC) beams have been designed, analyzed, and an assessment of the flexural behavior has been carried out from the experimental and numerical results. The beam was designed as a partially prestressed under-reinforced section with reinforcements distributed in two layers aiming to have a kind of progressive failure, imparting increased nonlinearity. The finite element (FE) analysis was carried out in the commercially available software ABAQUS® using the concrete damaged plasticity (CDP) approach for modeling the concrete, and the numerical results were found in a good agreement with the results obtained from the current design approach. The study introduced an effective design approach for the structural members prestressed using the BFRP tendons with improved ductility, and thereby provided a solution for the otherwise brittle failure of the under-reinforced BFRP-prestressed/ reinforced concrete structures.