Anziehen von geschraubten Verbindungen nach Eurocode 3 und DIN EN 1090-2

Tightening of bolted connections according to Eurocode 3 and DIN EN 1090-2.

With the introduction of Eurocode 3 and DIN EN 1090-2, great confusions arise in Germany regarding the execution of bolted connections in steel structures. This is based essentially - but not exclusively - on the question: which preload level may be applied in which connection type with which tightening procedure? Where the question of the "correct" tightening procedure is resolved relatively quickly, since this is clearly linked via DIN EN 1993-1-8 / NA at the height of the applied preload level, yields the question of the "correct" preload level for both the structural engineer and the executive steel construction company to major discussions since DIN EN 1090-2 offers the minimum preloading force Fp,C which is allowed to be applied in Germany only by the - although known, but absolutely unusual - combined method. Alternatively, the lower "old" German preloading force Fp,C* is defined in DIN EN 1993-1-8 / NA with execution rules for the modified torque method. Other practical questions relate to the tightening of non-preloaded bolts and the use of non CE-marked components of a CE-marked bolt assembly. As part of this paper, these and other issues for the tightening of bolted connections in steel structures are answered.