Abstract
This study aimed at examining the feasibility of using fiber-reinforced polymer (FRP) rebars instead of steel ones in prestressed concrete beams (PCBs) with external FRP tendons. By applying an experimentally validated program, numerical tests were performed on simply supported PCBs, with investigated variables including rebars’ type and area. Three types of rebars were considered, i.e., carbon, glass FRPs (CFRP, GFRP), and reinforcing steel. The ratio of tensile rebars ranged from 0.22% to 2.16%. The results indicated that the beams with CFRP rebars exhibited better crack mode and higher ultimate load than the beams with GFRP or steel rebars. GFRP rebars led to considerably higher ultimate deflection and tendon stress increment than steel rebars. In addition, several models for calculating the ultimate stress in unbonded tendons were assessed. An analytical model was also proposed to predict the tendon stress at ultimate and flexural strength in externally PCBs with steel and FRP rebars. The model predictions agreed well with the numerical results.
Highlights
Steel corrosion would lead to the deterioration of reinforced or prestressed concrete beams (RCBs or PCBs) [1]
The above-mentioned numerical can simulate the nonlinear behavior of PCBs with combined external fiber-reinforced polymer (FRP) tendons and internal steel/FRP
At a given load level, GFRP rebars lead to higher post cracking than CFRP or steel rebars
Summary
Steel corrosion would lead to the deterioration of reinforced or prestressed concrete beams (RCBs or PCBs) [1]. Their study showed load that capacities are reduced as the bending angle increases or the bending radius decreases Both numerical using BFRP composites as external tendons for strengthening RCBs can effectively improve structural and experimental [19,20] showed that behaviors of PCBs external and steel performance. They concluded that FRP tendons’ load capacities are reduced tendons, some bonded rebars need to be provided to avoid as a as theInbending angle increases or the bending radius decreases Both numerical and behaving experimental tied arch and limit the crack width and spacing [21].with. The findings obtained from the study of RCBs with instead of rebars steel ones thebe behavior of PCBs. This paper presents a numerical andtoanalytical study to evaluate feasibility of providing structural system from the former due external prestressing. Polymers 2020, 12, 2773 was proposed to predict the tendon stress at ultimate and flexural strength in externally PCBs
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