Abstract
Owing to seismic, wave, or wind actions, tubular joints used in onshore and offshore civil infrastructures may require retrofitting to withstand both static and cyclic loadings. In the present study, bearing capacities, failure modes, and ductilities of damaged tubular T-joints retrofitted with carbon fiber reinforced polymer (CFRP) were investigated. Two-step loading was applied: first, a pre-determined load was applied to induce chord deformation; this was followed by unloading and CFRP retrofitting. Subsequently, the specimens were reloaded to failure. Results showed that the retrofitted specimens exhibited a maximum capacity similar to and a plastic deformation slightly larger than that of the bare specimen when these subjected to static loading; the retrofitted specimens, which were not severely damaged, exhibited a higher compressive ductility index than that of the bare specimen when these subjected to cyclic loading.
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