PET FRP-concrete-high strength steel hybrid solid columns with strain-hardening and ductile performance: Cyclic axial compressive behavior. (1st June 2020)

• Record Type: Journal Article
• Authors: Zeng, Jun-Jie; Ye, Yu-Yi; Guo, Yong-Chang; Lv, Jun-Fan; Ouyang, Yi; Jiang, Cheng
• Is Part Of: Composites. Number 190(2020)
• Publication Date: 2020-06-01
• Subjects: Fiber-reinforced polymer (FRP) -- Confinement -- Polyethylene terephthalate (PET) FRP -- Large rupture strain (LRS) FRP -- High strength steel (HSS) -- FRP-Concrete-steel solid columns (FCSSCs) -- Square columns -- Axial compression; Composite materials -- Periodicals; Materials science -- Periodicals; Composite materials; Periodicals; Electronic journals; 620.118
• DOI: 10.1016/j.compositesb.2020.107903
• Languages: English
• ISSNs: 1359-8368

Abstract

Abstract: This paper presents the results of an experimental program on the behavior of fiber-reinforced polymer (FRP)-concrete-high strength steel solid columns (FCSSCs), with an outer polyethylene terephthalate (PET) FRP tube and an inner circular high-strength steel (HSS) tube, under cyclic axial compression. A PET FRP tube has a much larger rupture strain and a larger FRP hoop strain efficiency, leading to an excellent ductility of PET FRP-confined concrete. The HSS tube, which has a good deformation compatibility with the PET FRP-confined concrete in FCSSCs, provides a much larger longitudinal load carrying capacity and a larger confinement to the core concrete compared with a normal strength steel tube. The experimental results demonstrated that the axial load carrying capacity of an FCSSC is much larger than the summation of the axial load resistance of the hollow steel tube and that of the concrete-filled FRP tube; the buckling of the HSS tube is also prevented so that its post-yield material strength is effectively utilized. It is found that cyclic load-strain envelope curves lie closely to the corresponding monotonic load-strain curves, and repeated loading cycles increase the plastic strain while decrease the reloading new stress. The existing stress-strain model fails to provide an accurate prediction on the cyclic axial behavior of concrete under combined PET FRP-steel confinement.