Techno Press

Steel and Composite Structures   Volume 1, Number 1, March 2001, pages 17-32
The behaviour of a new type of connection system for light-weight steel structures applied to roof trusses
Olli Kaitila, Jyrki Kesti and Pentti Makelainen

Abstract     [Full Text]
    The Rosette-joining system is a completely new press-joining method for cold-formed steelrnstructures. One Rosette-joint has a shear capacity equal to that of approximately four screws or rivets.rnThe Rosette thin-walled steel truss system presents a new fully integrated prefabricated alternative tornlight-weight roof truss structures. The trusses are built up on special industrial production lines fromrnmodified top hat sections used as top and bottom chords and channel sections used as webs which arernjoined together with the Rosette press-joining technique to form a completed structure easy to transportrnand install. A single web section is used when sufficient but can be strengthened by double-nesting twornseparate sections or by using two lateral profiles where greater compressive axial forces are met. Anrnindividual joint in the truss can be strengthened by introducing a hollow bolt into the joint hole. Thernbolt gives the connection capacity a boost of approximately 20%. A series of laboratory tests havernbeen carried out in order to verify the Rosette truss system in practice. In addition to compression testsrnon individual sections of different lengths, tests have also been done on small structural assemblies andrnon actual full-scale trusses of a span of 10 metres. Design calculations have been performed on selectedrnroof truss geometries based on the test results, FE-analysis and on the Eurocode 3 and U.S.(AISI)rndesign codes.
Key Words
    Rosette-joint; truss testing; light-weight steel; roof truss; cold-formed steel; steel sheet joining.
Laboratory of Steel Structures, Department of Civil and Environmental Engineering Helsinki University of Technology, P.O. Box 2100, FIN-02015 HUT, Finland

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