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The enhanced economy of tubular piles by improved buckling design (ETIB) project focuses on the development of safe buckling design rules specific to embedded tubular piles with a view to enhancing their economic use in growth-oriented major civil engineering applications (quay walls for ports and harbours, cofferdams for deep urban excavations, etc.). The current version of Eurocode 3 requires that buckling is to be addressed in the design of those steel members resulting in a 10-20 % larger wall thickness, without allowing for the beneficial constraining effects provided by the soil into which they are embedded. Further, for a design according to the common shell buckling rules, several extremely conservative assumptions have to be made. Many years of practice, however, have revealed no bad experience with respect to buckling. The reason for the positive difference in the carrying behaviour between tubular piles and the laboratory shells arises from the complexity of the problem far beyond the basic rules of the codes. The ETIB project tackled the specifics of the buckling limit state within the framework of a physical soil structure interaction, boundary conditions and loadings, and geometrical imperfections based on extensive numerical and experimental investigations. As a result, for the case of combiwalls, improved assessment rules based on the different aspects influencing the carrying behaviour in a different way were derived and given as design proposals for improving and extending the existing design codes on shell buckling.

Additional information

Authors: HÜBNER A, Universität Karlsruhe (TH) Versuchsanstalt für Stahl, Holz und Steine, Karlsruhe (DE);SAAL H, Universität Karlsruhe (TH) Versuchsanstalt für Stahl, Holz und Steine, Karlsruhe (DE);HOLEYMAN A, Université Catholique de Louvain, Louvain-la-Neuve (BE);CHARUE N, RDCS, Liège (BE);TOMBOY O, RDCS, Liège (BE);BORTOLOTTI E, RDCS, Liège (BE);SCHMITT A, ProfilARBED SA, Esch-sur Alzette (LU);MEYRER M, ProfilARBED SA, Esch-sur Alzette (LU);JOKINIEMI H, Rautaruukki, Helsinki (FI)
Bibliographic Reference: EUR 23851 EN (2009), 166 pp. Euro: 20
Availability: Katalogue Number: KI-NA-23851-EN-S The paper version can be ordered online and the PDF version downloaded at:
ISBN: ISBN: 978-92-79-11275-1
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