The cast iron deck is a lightweight deck slab with excellent fatigue resistance. The cast iron decks are joined by high-strength bolts at the end ribs. However, there is a problem that the deck is separated when negative bending acts on the joint. As a countermeasure, we proposed a structure that uses both friction joint by the splice plate to the upper surface of the deck and tension type joint of end ribs. In this study, this new joint structure was analyzed by FEA to clarify the effect on separation of deck and the interaction between friction and tension type joint. Furthermore, we investigated how to improve the performance of the joint.
