Friction joints are used to join the cast iron deck and the main girder. In this study, the effect of the structural type of the support member between the deck and the girder on the slip behavior is investigated by push-out shear test. In addition, the presence or absence of taper in the joint and the effect of the bolt hole shape on the slip resistance will be examined. As a result, it was found that when the T-type support member was used, the slip resistance was lower than when the L-type support member. In addition, no significant difference was observed when slotted holes were used, and it was found that the slip resistance decreased when the taper was used.
