Abstract
A composite concrete column with encased fiber reinforced polymer (FRP) confined concrete cores (EFCCC) is proposed in this paper. The cross-sectional form of the EFCCC column is composed of several orderly arranged FRP confined concrete cores (FCCCs) surrounding a filled core concrete. This novel composite column has several advantages, such as higher compressive capacity, stronger FRP confinement, and ductile response. The compressive experiment is employed to investigate the compressive behavior of the EFCCC column with deferent parameters, such as outside concrete and stirrups. Test results show that the main failure mode of the EFCCC column with and without an outside concrete or stirrups is tensile fracture of the glass fiber reinforced polymer (GFRP) tubes. Compared to a reinforced concrete (RC) column, the strength and ductility of the EFCCC column was obviously improved by 20% and 500%, respectively. A finite element model (FEM) based on the Drucker–Prager (D-P) was developed that can accurately predict the axial compression behavior of the composite column with FRP confined concrete core. The predicted results obtained by using this FEM have excellent agreement with the experimental results.
Highlights
In regard to modern engineering structures, carrying capacity and deformation properties are in great demand [1]
Shaw et al [5] conducted three-point bending tests on three small scale prestressed concrete (PC) beams that have been damaged reinforced with carbon fiber reinforced polymer (CFRP) and glass fiber reinforced polymer (GFRP) externally bonded laminates
The initial damage in all specimens all encased FRP confined concrete cores (EFCCCs) columns were ruptures of the corner GFRP tubes after large area cracking occurred over the was concrete micro-cracking except for T8N specimens without outside concrete
Summary
In regard to modern engineering structures, carrying capacity and deformation properties are in great demand [1]. In the past two decades, fiber reinforced polymer (FRP) composites have been widely applied in civil engineering construction, because of their several advantages, such as higher corrosion resistance, higher strength to weight ratio, and superior durability in aggressive environments [2]. FRP composites are often used to reinforce existing concrete members, such as beams and columns for building structures, and many researchers investigated the performance of reinforced concrete beams and columns with FRP [3,4,5,6,7,8]. Results show externally bonded shear FRP can be used to regain and even exceed the shear capacity of the undamaged girder. Jiang et al [9] made an experimental study of FRP-confined reinforced concrete (RC) columns involving different bonding conditions between FRP and concrete
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