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Received: 12 March 2007; Revised: 2 May 2007; Accepted: 3 August 2007 ABSTRACT: The paper presents the results of checking experimentally the way of calculating an m-bolt single-cut joint with blind-bolts, dealt with by Wuwer [1, 2]. The method of calculating any arbitrary lap-joint was checked there by testing symmetrical five-blind-bolt and eight-blind-bolt joints of cold-bent profiles, the walls of which were 5.0 mm thick, respectively: stretched eccentrically and alternately bent. The present report, however, deals with the results of investigations on test elements with asymmetrical four-blind-bolt joints of walls, 4.0 mm thick, which were simultaneously subjected to bending and shearing. In all the three kinds of joints single-cut blind bolts type BOM-Rl6-4 were used [3]. Loads increasing proportionally until the destruction of the joint, were reiterated cyclically on stabilized levels. The set of equations describing the static behaviour of a joint was solved numerically, and the results were compared with the results of experimental investigations. For the bolt subjected to the highest effort in the 4-blind-bolt joint boundary curves of the load-carrying capacity were plotted for three cases of boundary states I, II and III. Moreover, the boundary curve of the load-carrying capacity was determined for the boundary state I. Basing on the example of a frame with flexible joints attempts have been made as well to assess the influence of interactive connections between three rigidities in a lap-joint, combined with a rotation and two shifts (perpendicular to each other) between the joined walls of sheet-metal sections. Each of the three instantaneous rigidities has been expressed by the coefficient of rigidity reduction and the parameter of rigidity degradation, depending on the quantities acting in the joint of the loads M, V and H.

THE BEHAVIOUR AND DESIGN OF LAP-JOINTS IN THIN-WALLED BAR CONSTRUCTIONS