Answer:
NCI to DIN EN 1993‑6, Cl. 2.3.1 allows for reductions of dynamic factors (vibration coefficients) for values ≥ 1.1. The reduced support loads may, therefore, be used for the design of support or suspension structures.
In CRANEWAY, if you select National Annex "DIN" and dynamic coefficients ≧ 1.1, the reduction is considered automatically.