期刊
THIN-WALLED STRUCTURES
卷 142, 期 -, 页码 149-159出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.tws.2019.05.009
关键词
Fiber-reinforced polymer (FRP); Steel tube; Confined concrete; Axial compression; Stress-strain model
资金
- National Natural Science Foundation of China [51778300]
- Natural Science Foundation of Jiangsu Province [BK20151520]
- 333 Project [BRA2016421]
- Qinglan Project of Jiangsu Province [QL2017]
- Priority Academic Program Development of the Jiangsu Higher Education Institutions (PAPD)
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.
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