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For crane runways with large spans, the horizontal load from skewing is often relevant for the design. This article describes the origin of these forces and the correct input in CRANEWAY. The practical implementation and the theoretical background are discussed.
For suspension cranes, the bottom chord of the runway girder is subjected to local flange bending due to the wheel loads in addition to the main load bearing capacity. The bottom chord behaves like a slab due to these local bending stresses and has a biaxial stress condition .
The article series about the design of crane girder welds is concluded by this article describing the design of web fillet welds, following the previous articles about the design of rail welds of crane girders at ultimate limit state and fatigue limit state. Both the ultimate limit state and the fatigue limit state are considered.
Based on the technical article about the ultimate limit state design of rail welds, the following explanation refers to the process of fatigue design of rail welds. In particular, this article explains in detail the effects of considering the eccentric wheel load of 1/4 of the rail head width.
The eccentric wheel load application of 1/4 of the rail head width has to be considered only for the fatigue design from damage class S3 according to DIN EN 1993‑6. An additional input option in detail settings allows you to consider this eccentricity for the fatigue design at the ultimate limit state as well. By selecting this option, the design with the eccentric load applied is always considered without regard to the damage class.
In CRANEWAY, the eccentric wheel loading of 1/4 of the rail head width is used for the fatigue design of welds as well as for craneway girder design according to the National Annex of Germany and as from the damage class of S3.
If crane runway girders are designed with flat steel rails, the welding of these rails is always a detail for the design. As a rail fixing, you can generally select between continuous and intermittent fillet weld. The following article provides an overview of the design processes and their specific features, especially when using the EN 1993‑6.
The NCI to DIN EN 1993‑6, part 2.3.1 allows reductions of dynamic coefficients for the values ≧ 1.1. Therefore, you can use these reduced support loads for the design of support and hanger structures. In CRANEWAY, if you select the National Annex ‘DIN’ and the dynamic coefficients ≧ 1.1, the reduction is considered automatically.
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