The Adhesion method is general to reinforce steel structures using FRP(Fiber reinforced Plastic) material. Until recently in many studies, the adhesion method is being utilized. Most of the problem of this method have been eliminated. The bond performance is not enough due to the delaminate of epoxy between FRP and steel. In order to improve the problem, a bolt tighting, FRP sheet wrapping is to evaluation the degree of bond performance improvement in study.

Rehabilitation of existing steel structure attached to a steel because cross-section is generally raising. But when the area of reinforcement increases, also increases the weight of steel can cause degradation of the operations. In addition, welding process cause discomfort which due to the interference of other process. To replace the existing method, there are researches and applications for civil steel structures on the outside. In this study, bond performance of FRP and Steel were tested to reinforce steel structures by using AFRP as well as CFRP.