Abstract
Fibre-reinforced polymer (FRP)-reinforced concrete members exhibit low ductility due to the linear-elastic behaviour of FRP materials. Concrete members reinforced by hybrid FRP–steel bars can improve strength and ductility simultaneously. In this study, the plastic hinge problem of hybrid FRP–steel reinforced concrete beams was numerically assessed through finite element analysis (FEA). Firstly, a finite element model was proposed to validate the numerical method by comparing the simulation results with the test results. Then, three plastic hinge regions—the rebar yielding zone, concrete crushing zone, and curvature localisation zone—of the hybrid reinforced concrete beams were analysed in detail. Finally, the effects of the main parameters, including the beam aspect ratio, concrete grade, steel yield strength, steel reinforcement ratio, steel hardening modulus, and FRP elastic modulus on the lengths of the three plastic zones, were systematically evaluated through parametric studies. It is determined that the hybrid reinforcement ratio exerts a significant effect on the plastic hinge lengths. The larger the hybrid reinforcement ratio, the larger is the extent of the rebar yielding zone and curvature localisation zone. It is also determined that the beam aspect ratio, concrete compressive strength, and steel hardening ratio exert significant positive effects on the length of the rebar yielding zone.
Highlights
The corrosion of steel reinforcement causes the loss of serviceability or the strength failure of reinforced concrete (RC) structures
This section describes the analysis of the influence of the fibre-reinforced polymer (FRP) reinforcement ratio on the development of the plastic hinge regions for hybrid FRP–steel reinforced concrete beams
In order to gain a comprehensive understanding of the plastic hinge regions of hybrid FRP–steel reinforced concrete beams, a systematic parametric study has been carried out
Summary
The corrosion of steel reinforcement causes the loss of serviceability or the strength failure of reinforced concrete (RC) structures. The structural performance of concrete beams can be improved by a combination of FRP and steel reinforcements. Current research on hybrid reinforced beams focuses on crack-width calculation, deflection evaluation, or strength prediction; few studies concentrate on plastic hinge problems. On the other hand, designing new structures requires this knowledge in order to predict the deformation capacity This necessitates an extensive study of the plastic hinge problem of hybrid. Three plastic hinge regions—the rebar yielding zone, concrete crushing zone, and curvature localisation zone—have been proposed, in order to discuss the plastic hinge problems of RC members [24] and FRP-reinforced concrete members [35,36,37]. This study is an attempt to assess the plastic hinge problem of hybrid reinforced beams through finite element analysis (FEA). The influence of the main parameters on the plastic hinge lengths of hybrid reinforced beams is evaluated through parametric studies
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