Experimentelle und numerische Untersuchungen der lokalen Spannungen in Kranbahnträgern nahe Quersteifen

Comprehensive study of local stresses at transverse stiffeners of crane runway girders based on tests and numerical calculations. In practice, welded crane runway girders with greater web heights are usually designed with additional transverse stiffeners between the supports. This increases the buckling resistance of the web and limits the torsion of the top flange due to eccentric wheel load application. However, this creates additional critical design details near the welded connections between top flange and stiffeners with regard to wheel load introduction into the girder web. These details have to be accounted for in the verification against fatigue failure. Furthermore, the current version of DIN EN 1993-6 does not contain any rules for calculating the local stresses in the web and in the transverse stiffeners for wheel load introduction near transverse stiffeners. This article therefore presents both laboratory tests and FE-calculations that investigate the local stresses in the vicinity of transverse stiffeners in detail. Subsequently, the determined stresses are used for comparative fatigue design checks at the relevant constructional details in relation to corresponding design checks without taking the influence of the transverse stiffeners into account. Finally, deficits in the current procedure are highlighted and recommendations for design practice are derived on the basis of the results obtained.