2012 Volume 19 Issue 74 Pages 74_11-74_18
At hybrid joints of steel girders using bolted and welded joints, it is necessary to implement erection pieces as restrainers of welded joints and to remove them after welding. To enable the connection without the erection pieces, we proposed a new connection method of hybrid joints, in which we use the bolted connections of longitudinal ribs as the restrainers by tightening the bolts before welding. To establish a procedure of the method, we carried out trial execution tests of hybrid joints. As a result, it was clarified that the bolted joints slipped at the time of untightening the bolts, while they did not slip at the welding stage. After the slip, the damage of the friction surfaces was localized to small regions around the remaining bolts.