Abstract
Based on the experimental tests of timber square columns strengthened by fibre-reinforced polymer sheets under axial compression, the failure modes, load carrying capacity, loading–strain curves, ductile and stiffness factors were examined. The results showed that in comparison with specimens without FRP reinforcement, the axial load carrying capacity, the peak of compression strain and stiffness of specimens with fibre-reinforced polymer reinforcement were all improved. The ultimate load carrying capacity of specimens with fibre-reinforced polymer reinforcement was improved by 68·9–100·2%. However, the ultimate displacement was decreased by 46·1–56·9%, and the lowest displacement was found in the specimens strengthened by two layers of basalt fibre-reinforced polymer. Meanwhile, specimens reinforced by two layer of carbon fibre-reinforced polymer and aramid fibre-reinforced polymer sheets showed a higher level of ultimate displacement and stiffness than specimens with basalt fibre-reinforced polymer reinforcement. Additionally, the failure mode of tested specimens was influenced not only by the type of fibre-reinforced polymer sheets but also by the fractured wood texture.
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