Beitrag zur Ermüdungsfestigkeit von Schienenschweißnähten bei Kranbahnen

Contribution to characteristic fatigue strength of rail welds at crane runways. The rail welds of today's crane runways usually made of hot rolled sections for light and moderate crane service form one important critical detail of the wheel load application in terms of fatigue. The characteristic fatigue strengths and the definition of damage accumulation under combined loading of the national and European design codes are compared and critically discussed. Moreover, an overview of the few, available test data of large‐scale specimens on the fatigue behaviour under wheel load application is given, and own girder tests are presented.     

Zur Frage der Ermüdungsfestigkeit von Kopfbolzendübeln

Fatigue resistance of headed shear studs. The design concepts in current national and international standards for headed shear studs in composite structures under fatigue loads are based on the assumptions, that the ultimate shear resistance of headed shear studs and the load‐deflection behaviour under service loads are not affected by high cyclic loading up to the theoretical value of their life time. These assumptions do not represent the real behaviour of headed shear studs subjected to fatigue loading. The paper deals with the results of the project C8 within the scope of Collaborative Research Centre 398 funded by the German Research Foundation. Based on a comprehensive program of experimental investigations new damage models to describe the effect of high cyclic loading on the local behaviour of headed shear studs are developed. On this basis the interaction between the local damage at the studs and the global behaviour of composite beams is investigated.