StahlbauVolume 85, Issue 1 InhaltsverzeichnisFree Access Inhaltsverzeichnis 2015 First published: 05 January 2016 https://doi.org/10.1002/stab.201690012AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onEmailFacebookTwitterLinkedInRedditWechat Volume85, Issue1January 2016 RelatedInformation

To be competitive on the international market, weight optimization is one of the main objectives in engineering. As Liebherr MCCtec GmbH mainly uses welded sheet metal- and tube constructions, there has to be a large focus on the proof of stability. A huge number of actual rules and regulations in the crane industry are based on nominal stress concepts. On the other hand, finite element method is a widely used method in the design and analysis of cranes. Using the very exact results of this method within these conservative safety concepts leads to uneconomic design. Therefore, creativity in the interpretation of results is required. In a first step, the theoretical background of stability issues will be covered in this paper. Subsequently the actual situation regarding rules and regulations is discussed. Based on that discussion, the actual approach in Liebherr MCCtec GmbH will be explained. A special attention is given to the issue of dealing with imperfections. By means of two examples the Liebherr MCCtec GmbH approach will be illustrated. Concluding, open issues and ongoing tasks will be examined.

Summary. This contribution deals with the numerical simulation of ultimate load tests on continuous beams made of br e reinforced concrete. The employed material model is based on the theory of plasticity taking into account the softening material behaviour of br e reinforced concrete in tension.