Abstract
Studying the stress–strain relationship of fiber-reinforced polymer (FRP)-confined rubber concrete (RuC) plays an important role in its application in engineering projects. Most of the existing stress–strain relationship models are established based on the test data of FRP-confined rubber concrete with circular cross-sections, and the effect of the section shape is not considered. Therefore, an analysis-oriented stress–strain model of FRP-confined circular and square rubber concrete columns was studied in this paper for the first time. A database that includes the rubber particle content and section shape on the peak stress-peak strain and axial–lateral strain relationship of FRP-confined rubber concrete was established by collecting 235 test data from the literature. By modifying the key parameters in the existing FRP-confined normal concrete stress–strain relationship model, a unified stress–strain relationship model of FRP-confined RuC with circular and square columns is established. The proposed model is verified, and a good accuracy of the model is proven.
Highlights
Rubber concrete (RuC) has the characteristic of low compressive strength compared to normal concrete, which limits its application in building structures
fiber-reinforced polymers (FRP) has the advantages of high strength and good durability [4–6], and its lateral confinement effect can effectively improve the compressive strength of rubber concrete (RuC) [7], which makes it possible to apply RuC in engineering projects as structure building materials
This paper aims to propose a new model for predicting the stress–strain of FRP-conThis paper aims to propose a new model for predicting the stress–strain of FRPfined circular and square rubber concrete columns
Summary
Rubber concrete (RuC) has the characteristic of low compressive strength compared to normal concrete, which limits its application in building structures. Steel has been historically used to provide the required lateral confinement, fiber-reinforced polymers (FRP) have been used extensively over the last 20 years as a strengthening solution to enhance the ultimate compressive strain of concrete cylinders [1–3]. FRP has the advantages of high strength and good durability [4–6], and its lateral confinement effect can effectively improve the compressive strength of RuC [7], which makes it possible to apply RuC in engineering projects as structure building materials. Much experimental research and theoretical analyses on the mechanical properties of FRP-confined rubber concrete have been performed by many researchers. Moustafa et al [8] conducted experimental research on the stress–strain relationship of FRP-confined rubber concrete and normal concrete under different strain rates.
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