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The latest International Colloquium on Stability and Ductility of Steel Structures (SDSS 2025) took place from 8 to 10 September 2025 in the World Trade Center of the beautiful Spanish city Barcelona. The organizing committee, led by Esther Real and Enrique Mirambell, welcomed around 250 attendees. In addition to classic steel engineering topics, the wide-ranging program of the conference included presentations on additive manufacturing and 3D printing, digitalization and AI, high-strength and stainless steels, as well as reuse and retrofitting. The series of international colloquia started in Paris in 1972. The original International Colloquium on Column Strength started at a time when Professor H. Beer and Dr. G. Schulz from Graz University of Technology had just developed the first version of the European buckling curves. With the support of the Structural Stability Research Council (SSRC) and of the European Convention for Constructional Steelwork (ECCS), the colloquium was organized to provide a forum for international scientific knowledge exchange on the buckling strength of columns. Later, the colloquium was extended by a variety of stability phenomena in steel construction and plastic design. The last conferences took place in Budapest (2002), Lisbon (2006), Rio de Janeiro (2010), Timisoara (2016), Prague (2019), Aveiro (2022) and last September in Barcelona. Following the great success of the previous conferences in Timisoara, Prague and Aveiro, the ECCS Technical Committee 8 − Structural Stability (TC8) organised a Special Session with a total of 16 presentations. In the opening address, the Chairman of TC8, Prof. Bert Snijder, reported on the objectives and activities of ECCS and its TC8 committee. ECCS is the umbrella organisation of the European Steel Construction Associations. It promotes steel construction, participates in the development of standards, supports research and development, and provides information on steel construction topics through publications, conferences and educational events. TC8 is one of the 11 active technical committees of the Technical Management Board (TMB) of ECCS. It is the leading European technical committee in the broad field of stability of steel structures. Within TC8, new design rules and recommendations are developed and discussed to fill the gaps present in the European codes. The technical presentations of the TC8 Special Session covered a wide range of topics in the field of stability of steel structures. Among others, Bert Snijder, Chair of TC8 and Professor of Structural Design at Eindhoven University of Technology, gave an overview of the Technical Report CEN/TR 1993-1-102 on the elastic critical buckling of members. In addition, there were contributions on imperfection assumptions used for GMNIA and GNIA, residual stresses and buckling resistances of HSS welded sections, and closely spaced double angle members with typical support conditions. Furthermore, presentations were given on the lateral torsional buckling capacity based on an advanced residual stress approach, a general formulation of uniform and non-uniform slender I-section beams as well as on stability and plasticity interaction effects of steel sway structures. In preparation for the present issue of Steel Construction, a working group of TC8 was asked to make a selection of submitted papers, which were then adapted to the format of this journal by the authors and supplemented in terms of content. We wish you an interesting and informative reading of these contributions. Dresden, Eindhoven and Barcelona, January 2026 Prof. Dr. Richard Stroetmann Prof. ir Bert Snijder Prof. Esther Real Prof. Enrique Mirambell