Zum Tragverhalten von lasergeschweißten Stahlhohlplatten im Brückenbau

摘要

Abstract: In contrast to the widely used orthotropic plate in steel bridge constructions, hollow plates provide higher longitudinal and transverse load capacities and also a better load distribution perpendicular to the webs in the area of locally concentrated wheel loads. However a cost-efficient assembly of hollow plates was not possible with current welding methods so far.By now modern laser welding methods enable the assembling of these hollow plates with their statical and structural advantages in an economic way, like in the maritime application where laser-welded steel hollow plates are successfully used since the mid-1990s. Therefore previous studies on the load bearing behavior of hollow plates refer only to the typical dimensions of the plates on maritime application with a cover sheet thickness ≤ 4 mm. Research with the dimensions and sheet thicknesses which are normally used in steel bridge constructions are not provided.This study investigates the structural behavior of laser-welded hollow plates in the geometry and thickness range of steel bridges and corresponding load cases.Based on the examination of existing calculation methods, the main parameters influencing the structural performance were analyzed and the relevant effects in the area of local load introduction were identified by own experimental and extensive numerical investigations.The results of this analysis were used to develop a simplified approach to determining the main cover sheet tensions in the area of locally concentrated wheel loads. For two decisive load cases the approach is prepared in form of a design manual.For the certain use of hollow plates for example in the maritime application, in steel bridge construction or in steel building construction the various load cases can be reduced to a few corresponding cases. For these decisive load cases calculation methods can be developed according to the models and methods used in this work. -