Reference to e.g. Industry Code of Practice FEM 9.841 / 10.2.10 “Storage systems with rail dependent storage and retrieval (S&R) equipment – Interfaces”. With the booming e-commerce also the number of racking structures operated by S&R equipment have been exploded.
The design standard “Eurocode 3: Design of steel structures – Part 1-9: Fatigue” provides rules to determine the fatigue resistance for details of steel structures. The S-N curves provided are for welded or bolted connection details as applied in “traditional” structures with steel thicknesses in accordance.
Cold-formed members have a relatively small thicknesses (1 mm – 6 mm) preventing three-dimensional stress distributions. Their connections subjected to fatigue are generally bolted. Therefore, the design rules in EN 1993-1-9 need to be extended to cold-formed structural details.