Direct buckling resistance check of complex steel plated structures

Kövesdi, Balázs Géza and Dunai, László (2026) Direct buckling resistance check of complex steel plated structures. In: Annual Stability Conference of the Structural Stability Research Council, SSRC 2026. Structural Stability Research Council (SSRC), [s.l.], pp. 436-451. ISBN 9798331336813

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Abstract

Finite element analysis-based design of steel structures is increasingly prevalent in applied engineering. However, comprehensive standardization was lacking in the past. To address this gap, a new Eurocode part - EN 1993-1-14 - has been developed to support the application of the numerical model-based design. The design rules are divided into two categories: (1) numerical design calculations and (2) numerical simulations. The first category addresses practical design scenarios, while the second allows for supplementing physical experiments. Within numerical design calculations, there are two sub-tracks: (a) analyses requiring subsequent design checks and (b) direct resistance check. The current paper focuses on the direct buckling resistance checks, where the ultimate buckling resistance is obtained directly from the numerical analysis, eliminating the need for additional analytical or empirical calculations. This analysis method is widely employed for buckling assessments of members, and segments, but not for complex structures (e.g. full bridges). The paper demonstrates its application on complex structures, specifically a steel railway arch bridge with a span of 100 meters (328 feet), where arch buckling is the critical failure mode. The study presents the methodology for direct buckling resistance check and its application to complex bridge structures. It includes details on development, verification, and validation of the numerical model, application and combination of equivalent geometric imperfections, as well as results from the buckling resistance check. © SSRC 2026.

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