There exist two fundamentally different construction methods for the hanger connections of tied arch bridges and network arch bridges, which correspond to the state of the art. The present master's thesis compares the welded and the forged hanger connections regarding their service life. The comparison is based on the fatigue check in accordance with Eurocode 3 and a technical code of the International Institute of Welding. The required input values are calculated using the finite element programm Abaqus FEA. With the help of a simplified 2D model the term stress concentration factor is introduced, meaning the relation of the maximum principal normal stress to the nominal stress at a defined cross section. Furthermore, the relevant geometric parameters for a fatigue analysis are determined. In a next step, a 3D model of the welded hanger connection is created. A geometric parameter analysis determines the range of the stress concentration factors. The geometry of the forged hanger connection is determined by scanning a real hanger connection using a 3D scanner. This scan is convered into a 3D model, which is used for calculations in Abaqus FEA. Stress concentration factors are identified. In the final chapter the welded and forged hanger connection are compared regarding the different fatigue checks. Finally, a comparison of the characterisic values used for a cost estimation is done.