In their long standing existence, bridge constructions are facing a multitude of load cycles, which could cause a fatigue of the material. In contrast to the well studied fatigue behavior of steel there are a lot of uncertainties about the exact influences and about the concrete damage, caused by fatigue. For the construction of durable bridges, the Vienna University of Technology follows an approach, where the mild steel reinforcement and the waterproofing of post tensioned bridges can be omitted. This brings new and efficient construction methods. For the road surface a concrete layer is casted directly onto the roughened surface of the bearing structure. This causes a joint which is due to the lack of shear reinforcement an alleged weak point of the construction. This Masters Thesis is, beside the theoretically annotation of definitions about concrete fatigue, about the analysis of fatigue tests on prestressed concrete beams with an unreinforced concrete-shear-joint. There have been tests on four specimen in the experimental laboratory of the Institute of Structural Engineering.
There the fatigue behavior of the whole beam and especially of the concrete joint has been explored. The result of the tests was positive, because neither due to the fatigue tests nor to the static tests an optical or a metrological collapse could be noticed.