Tarcie obrotowe w połączeniach zakładkowych na sworznie w złożonym stanie obciążenia

The paper presents the calculation model of any single-cut lap-joint, extended - in relation to up to now considered one by authors - about values of torsional moments. Torsional moments result from journal friction occurring in the axis of every bolt in the joint which is simultaneously bended and sheared. The modified analytical model has been verified experimentally on the example of eccentrically loaded 3- and 4-bolts joints, where walls of cold formed sections were connected by means of blind bolts of the type BOM R16. Experimental and numerical results are compared on the diagrams of relationship occurring between moment M bending the connection and angle of mutual rotation phi/J of joined walls. Values of stiffnesses of a 3-bolt joint according to EC3 determined on the basis of initial stiffness Sj.ini and by means of component method were compared.