Analysis of fatigue tests results of steel elements in the light of the requirements of European standards

Parts 1÷9 and 1÷10 of the Eurocode 3 and the PN-EN ISO 5817: 2014 standard ordered the rules for designing steel structures exposed to fatigue. The given FAT fatigue class- es were determined according to the same algorithm for the tested quality level elements B and C. The article shows that this algorithm can not be used for aging elements and with welding incompatibilities, notches of quality level D and larger. Fatigue requirements from parts 1÷9 of Eurocode 3, as well as impact strengths from parts 1÷10, should not ap- ply to exploited structures.