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The overall objective of the �Efficient lifting equipment with extra high-strength steel� (LiftHigh) research project was to obtain improved utilisation of extra high-strength steels, in this context defined as steels with yield strengths in the interval 460 to 1 100 MPa, and thereby expand the limits for structural steels available for crane manufacturers as well as for other applications. The work within the project included actions focusing on fatigue resistance, resistance to global and local buckling, and the development of methods for advanced design with non-linear FEM. A specific aim of the project was to show that the use of extra high-strength steel makes it possible to obtain a 20 to 40 % reduction in weight for a given function. This aim is in accordance with the desire amongst crane users, indicated by an enquiry at the beginning of the project, that decreased crane weight should be the first priority for future development. The final report presents examples of how to use FEM for design as well as examples of the redesign of an existing trolley structure and a telescopic boom. Some of the conclusions show that it is possible to achieve substantial weight reduction by using extra high strength steel. In the examples the weight reductions were 38 % and 18 %. Investigations focused on global and local buckling and gave no indication that the design models already in use, for instance in EN 1993-1-5, for steels with regular yield strengths cannot be applied also for high-strength steels with yield strength up to 1 100 MPa. However, as regards welded plates, the design rules in EN 1993-1-5 seem to slightly overestimate the resistance (if the modified slenderness is greater than ~ 0.9).

Additional information

Authors: LAGERQVIST O, Luleå University of Technology, Luleå (SE);CLARIN M, Luleå University of Technology, Luleå (SE);GOZZI J, Luleå University of Technology, Luleå (SE);VÖLLING B, RWTH, Aachen (DE);PAK D, RWTH, Aachen (DE);STÖTZL J, RWTH, Aachen (DE);LIEURADE H-P, CETIM, Senlis (FR);DEPALE B, CETIM, Senlis (FR);HUNTER I, CETIM, Senlis (FR);HERION S, University of Karlsruhe, Karlsruhe (DE);BERGERS J, University of Karlsruhe, Karlsruhe (DE);MARTSCH R-M, Liebherr-Werk Ehingen, Ehingen (DE);CARLSSON M, SSAB Oxelösund (SE);SAMUELSSON A, SSAB Oxelösund (SE);SONANDER C, SSAB Oxelösund (SE)
Bibliographic Reference: EUR 22569 EN (2007), 89 pp. Euro: 15
Availability: Katalogue Number: KI-NA-22569-EN-S The paper version can be ordered online and the PDF version downloaded at:
ISBN: ISBN: 978-92-79-05005-3
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