The use of non-metallic composite reinforcement, such as Fiber Reinforced Polymer (FRP), in concrete structures is becoming increasingly common. While the design principles for statically determinate concrete structures reinforced with FRP are well-established, the behavior of statically indeterminate structures, such as continuous beams, remains less understood. Traditionally, in the case of steel-reinforced continuous beams, it is possible to assume a certain redistribution of bending moments and to use the principle of linear elastic analysis with limited redistribution in design. However, ACI 440.1R-15 and the new generation of Eurocode advise against considering moment redistribution in FRP-reinforced structures due to the brittle nature of FRP materials and their linear elastic behavior up to failure. Despite the limited number of studies, existing research suggests some moment redistribution may occur in FRP-reinforced continuous beams. This paper explores this potential by presenting the results of an analytical study examining the moment-curvature relationship of concrete sections reinforced with FRP. A parametric study assesses the influence of reinforcement ratio and material properties of concrete on redistribution capacity. The goal is to develop a simplified model enabling moment redistribution in the design of continuous beams reinforced with FRP. By comparing the analytically determined internal forces with experimental results from tests on two-span continuous beams, the study seeks to validate the proposed model. This research contributes to a deeper understanding of FRP-reinforced concrete structures, addressing current design limitations and potentially leading to more efficient and safer design practices.

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Flexural Behavior of Indeterminate Concrete Structures Reinforced with Embedded FRP Bars

  • Kateřina Mrkvová,
  • David Vašátko,
  • František Girgle,
  • Petr Štěpánek

摘要

The use of non-metallic composite reinforcement, such as Fiber Reinforced Polymer (FRP), in concrete structures is becoming increasingly common. While the design principles for statically determinate concrete structures reinforced with FRP are well-established, the behavior of statically indeterminate structures, such as continuous beams, remains less understood. Traditionally, in the case of steel-reinforced continuous beams, it is possible to assume a certain redistribution of bending moments and to use the principle of linear elastic analysis with limited redistribution in design. However, ACI 440.1R-15 and the new generation of Eurocode advise against considering moment redistribution in FRP-reinforced structures due to the brittle nature of FRP materials and their linear elastic behavior up to failure. Despite the limited number of studies, existing research suggests some moment redistribution may occur in FRP-reinforced continuous beams. This paper explores this potential by presenting the results of an analytical study examining the moment-curvature relationship of concrete sections reinforced with FRP. A parametric study assesses the influence of reinforcement ratio and material properties of concrete on redistribution capacity. The goal is to develop a simplified model enabling moment redistribution in the design of continuous beams reinforced with FRP. By comparing the analytically determined internal forces with experimental results from tests on two-span continuous beams, the study seeks to validate the proposed model. This research contributes to a deeper understanding of FRP-reinforced concrete structures, addressing current design limitations and potentially leading to more efficient and safer design practices.