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.

由于地震，波浪或风的作用，陆上和海上民用基础设施中使用的管状接头可能需要进行改造，以承受静态和循环载荷。在本研究中，研究了碳纤维增强聚合物（CFRP）改造的受损管状T型接头的承载力，破坏模式和延性。分两步施加载荷：首先，施加预定载荷引起弦变形。然后进行卸载和CFRP改造。随后，将标本重新加载至失败。结果表明，在静载荷作用下，改型后的试件与裸试件相比具有最大的承载能力，塑性变形略大。没有严重损坏的改装样品，