Port and harbor concrete structures suffer from the attack of chloride ion that may cause degradation of materials. As a result, expansion of rebars due to corrosion may induce cracks in concrete cover and consequent fall of cover concrete. Therefore, it is essential to keep port and harbor concrete structures in good condition during their service period by means of regular maintenance and repair or strengthening when required. The execution timing and methods of measures against chloride-induced deterioration should be well examined with the extent of damages. For this purpose, it is necessary to evaluate the remaining structural performances such as load-carrying capacity and ductility.
　From these points of view, the study on the relationship between the degree ofrebar corrosion and the basic mechanical behaviors of deteriorated concrete members has been undertaken experimentally by loading tests. As a part of the study, this paper presents the experimental results and discussion on T-shaped reinforced beam-to-column joint structures subject to rebar corrosion. At first rebars in the joint part was artificially and rapidly corroded by means of the electrolytic technique. The degree of corrosion was monitored by electrochemical methods. Then flexural and shear loads were applied at the joint. It was concluded that the decrement in load-carrying capacity due to corrosion was evaluated by taking into account of the reduced cross section of rebar. It was also made clear that local transverse displacement of the member was affected by deterioration of bond performance between rebars and concrete at the joint.