Experiment on Behavior of Concrete Columns Confined by High Elastic Module Polyethylene Fiber Sheet Under Axial Compression

Based on the experiment on concrete columns confined with polyethylene fiber reinforced polymer(PEFRP) sheets under axial compression,the authors emphasized on analyzing failure configuration,bearing capacity,stress-strain curve and ductility.It is shown that: 1) comparing with the specimen without being confined,bearing capacity of concrete quadrate columns confined by PEA-L-2,PEA-L-3,PEB-L-2 and PEB-L-3 improves 10%,35%,27% and 30% respectively,peak strain improves 195%,80%,207% and 182% respectively;2) bearing capacity of concrete circular columns confined by PEA-C-2,PEA-C-3,PEB-C-2 and PEB-C-3 improves 11%,21%,37% and 53% respectively,peak strain improves 112%,150%,159% and 142% respectively.Toughness index could be adopted to evaluate the ductility of constraint column,and the result shows that PEA is better than PEB in improving column toughness index I₁,but PEB which has high elongation rate improve column late ductility effect more apparent.