Study on Composite Action between Steel Girder and Lower Concrete Slab in Steel-Concrete Double Composite I-girder Bridge

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Recently, in Japan, the steel-concrete composite bridge aiming at reducing construction cost and shortening work periods is extensively adopted. For instance, the steel-concrete double composite continuous box girder bridge, which has two concrete slabs at upper and lower surfaces of the steel box girder, is one of its examples. The structural system has the advantage of being able to reduce the steel lower flange thickness in the region of the intermediate supports. At the moment, the shop assembly cost of the box girder is more expensive than that of the Twin-I girder bridge. Therefore, the author had been proposed the steel-concrete double composite twin I-girder bridge.However, the composite action by adopting the headed studs welded both on the lower flange plate and web plate in double composite twin-I girder bridges is not yet clarified perfectly. In this research, the author carried out the static and fatigue push-out test for headed stud, which has combination arrangement both in horizontal and vertical directions.