Since corrosion of bridge connections has increased, various repair methods using bypass members, which take over the load transferred to the connections, have been developed extensively. In this study, the authors focus on the joints between the bypass member and the existing girder. When joining the bypass member using friction type bolted joint, the paint on existing girder must be removed to ensure roughness. To eliminate this step, we developed new joint system using combined joints with adjustment plates. The adjustment plates are needed to secure the space for removing bolts during joint disassembly. The joint between the existing girder and the adjustment plate consists of bearing type joints, while the joint between the adjustment plate and the bypass member is friction type joints. The combined joints can eliminate the surface treatment process of the existing girder and reduce the number of bolts compared to general frictional joints. This can improve work efficiency on-site. However, the stress transfer mechanism of the combined friction and bearing type joints has not been clarified, and a design method has not been established. Therefore, in this study, FE analysis was conducted to elucidate the load transfer mechanism of the combined friction and bearing type bolted joints. As a result, combined joints can smoothly transfer loads from the existing girder to bypass member. In addition, a method for estimating the bearing capacity of joints was discussed.