Experimental study on hybrid concrete-filled fiber reinforced polymer tube (HCFFTs) columns under simulated seismic loading

The concrete-filled fiber-reinforced polymer (FRP) tube (CFFT) system has been widely studied as a promising alternative to conventional reinforced concrete (RC) for the construction of bridge columns. While unreinforced CFFT columns are attractive their ease construction, limited energy dissipation capabilities have restricted application seismic regions. hybrid (HCFFT) was introduced address this shortcoming by incorporating steel reinforcement into FRP shell in form 30-μm fibers. This combines CFFTs with characteristics lightly study reports first experimental investigation on performance HCFFT through large-scale testing two under combined axial compression and cyclic lateral loading. Two shear loading conditions were studied. flexural capacity, mode failure, residual deformation, capacity evaluated. low-shear specimen reached drift ratio 10.5% high-shear 6.5%. specimens both displacement ductility demands above 5, demonstrating is appropriate use column curvature profiles showed prevented localized yielding fibers, which allowed an efficient distribution plasticity along height enhanced ductility. results indicate that can achieve high inelastic deformations simulated without substantial degradation stiffness. It anticipated data will inform future research design manufacturing process elements encourage further analytical studies.