The authors have proposed hybrid structures that can transmit the stress from steel girders to concrete piers without bearings. The structures consist of steel pipes and perfobond rib shear connectors. The concrete piers are put into the steel pipes. The authors carried out experiments in mechanical characteristics on three kinds of the structures with cyclic loading tests, Type 1 (the steel pipe with a plate at its top), Type 2 (the steel pipe with the plate at its top and the shear connectors) and Type 3 (the steel pipe and the shear connectors). As the results of the experiments, there are the following mechanical characteristics in the structures; adhesion stage between the steel pipes and the concrete piers, shear stage between the connecters and the concrete piers, and yield stage on steel bars in the piers. Type 2 and Type 3 have enough strength and ductility.
