Tomoki TANAKA
Study of CFRP repair in steel member joint was corrosion damage
Takeshi MIYASHITA
Most of the deterioration factor of steel structures is corrosion. Among them, the corrosion cases caused by water leakage from the expansion joint there have been many reports of. As one of its corrosion example, cases where the through hole occur in the steel member junction has been reported.
Caul plate repair as a conventional repair methods can be mentioned. However, Caul plate repair is not suitable if damage is remarkable. This is due to opening the bolt holes in the damaged member. Therefore, CFRP repair that can repair without damaging the existing structure has attracted attention. From the previous studies, by applying the CFRP repair, compressive load performance has been found to be restored to no damage condition. However, the tensile force is not investigated with respect to cases that act.
In this study, applying the CFRP repair in the test body simulating the damage situation of the steel member joint, were carried out tensile test. Test case, there are two types. The former is by creating an epoxy putty material to the junction of the steel member, pasted CFRP in the under flange. The latter pasted that stretched the CFRP to the weld toe. From the test results, by applying the CFRP repair, the tensile load performance has been found to be not restored to no damage condition. The former case results from the fact that the load transmission efficiency was reduced. In the latter case result from the fact that the CFRP was peeling.
Accordingly, in concrete structures was carried out addition tensile test using CF anchor that is used as the end fixing material of CFRP. From the test results, by applying the CF anchor repair, the tensile load performance has been found to be not restored to no damage condition. The reason is that by CF anchor folds, because the load transmission efficiency is lowered. This problem can be improved by a combination of CFRP and CF anchor. This will be the future of the agenda.
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