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A platform for research: civil engineering, architecture and urbanism
Stress-strain model of an FRP-confined concrete filled steel tube under axial compression
Abstract An FRP (fiber-reinforced polymer) -confined concrete filled steel tube is formed by the combination of FRP material and a concrete filled steel tube, and it combines the advantages of FRP-confined concrete and a concrete filled steel tube (CFT); however, there is still no effective model to generally describe the complete stress-strain curve of a concrete filled FRP-confined steel tube. The stress-strain response of a concrete filled FRP-confined steel tube features the dual characteristics of both FRP confined concrete and steel confined concrete. In this paper, ninety-six test results of FRP confined circular CFT columns under axial compression were collected from different researchers. The steel tube confinement index is taken as an additional key influencing parameter on the strength and deformation, and calculation methods for the ultimate strain, ultimate stress, peak strain and peak stress of a concrete filled FRP-confined steel tube are established by taking into account the steel tube confinement index. Moreover, the stress-strain model was developed to describe the complete stress-strain curve consisting of the four stages of a concrete filled FRP-confined steel tube. The proposed model reflects the characteristics of the stress-strain behavior of a concrete filled FRP-confined steel tube with good accuracy and simplicity.
Highlights A large database of 96 test results of the FRP confined CFT columns under axial compression is collected. The model of the full curve of the FRP confined CFT columns is developed. The proposed model shows a reasonable prediction of the stress-strain relationship for FRP confined CFT columns.
Stress-strain model of an FRP-confined concrete filled steel tube under axial compression
Abstract An FRP (fiber-reinforced polymer) -confined concrete filled steel tube is formed by the combination of FRP material and a concrete filled steel tube, and it combines the advantages of FRP-confined concrete and a concrete filled steel tube (CFT); however, there is still no effective model to generally describe the complete stress-strain curve of a concrete filled FRP-confined steel tube. The stress-strain response of a concrete filled FRP-confined steel tube features the dual characteristics of both FRP confined concrete and steel confined concrete. In this paper, ninety-six test results of FRP confined circular CFT columns under axial compression were collected from different researchers. The steel tube confinement index is taken as an additional key influencing parameter on the strength and deformation, and calculation methods for the ultimate strain, ultimate stress, peak strain and peak stress of a concrete filled FRP-confined steel tube are established by taking into account the steel tube confinement index. Moreover, the stress-strain model was developed to describe the complete stress-strain curve consisting of the four stages of a concrete filled FRP-confined steel tube. The proposed model reflects the characteristics of the stress-strain behavior of a concrete filled FRP-confined steel tube with good accuracy and simplicity.
Highlights A large database of 96 test results of the FRP confined CFT columns under axial compression is collected. The model of the full curve of the FRP confined CFT columns is developed. The proposed model shows a reasonable prediction of the stress-strain relationship for FRP confined CFT columns.
Stress-strain model of an FRP-confined concrete filled steel tube under axial compression
Zhang, Yirui (author) / Wei, Yang (author) / Bai, Jiawen (author) / Zhang, Yongxing (author)
Thin-Walled Structures ; 142 ; 149-159
2019-05-07
11 pages
Article (Journal)
Electronic Resource
English
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