| 英文摘要 |
The performance of reinforced concrete columns subjected to axial force is relative to its confinement. Carbon fiber reinforced polymer(CFRP) wrapping, a generally adopted retrofit method, has been proven to have not effectively provided the required confining force due to the bulging effect on the column face. Therefore, this paper focused on the performance of the retrofitted full-scale rectangular RC columns using different retrofit schemes that include the proposed CFRP wrapping conjugated with CFRP anchors method. A total of 11 rectangular RC columns with low transverse reinforcement ratio were constructed. Among them, one was tested as benchmark; one was purposely constructed with larger transverse reinforcement ratio; five were retrofitted using CFRP wrapping and CFRP anchors; and the other four were retrofitted using different shapes of steel jacketing only or with adhesive anchors. All the specimens were subjected to monotonic incremental axial force until failure occurred. Results demonstrated that the ductility of the specimens retrofitted using CFRP wrapping with CFRP anchors has significantly improved compared with those retrofitted using CFRP wrapping only. On the other hand, the specimen with octagonal steel jacketing performed better not only on ductility but also on strength than all other specimens. Finally, a novel numerical model considering the contribution of the retrofit material will be proposed and validated in the future. |
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