Mechanical properties of aramid fiber reinforced polymer confined laminated bamboo lumber column under cyclic loading

This paper explores the effect of using fiber-reinforced polymer (FRP) wrap on the hysteresis curve, skeleton curve, bearing capacity, stiffness and ductility of short laminated bamboo lumber (LBL) columns under cyclic loading. Aramid fiber reinforced polymer (AFRP) was used in the current study to prevent premature failure of LBL columns through confinement. Test results showed that AFRP confined short LBL columns failed mostly due to overall bending whilst some specimens showed end crushing. The ultimate bearing capacity, stiffness and ductility coefficients of AFRP confined short columns were considerably higher than those for unconfined short columns. The stress-strain curves of the specimens under cyclic loads were lower than those of the specimens under monotonic loads. Finally, this paper put forward the calculation equations of the stress-strain curves and the skeleton curves of the specimens under cyclic loads, and the proposed equation is able to accurately predict the entire cyclic stress-strain response.