Influence of geometrical imperfections and residual stresses on the reliability of high strength steel welded I-section columns using Monte Carlo simulation

Journal Article (2024)
Author(s)

José Osvaldo Ferreira Filho (Universidade de Coimbra)

Luís Carlos Silva (Universidade de Coimbra)

Trayana Tankova (TU Delft - Steel & Composite Structures)

H. Carvalho (Universidade de São Paulo, Universidade Federal de Minas Gerais)

Research Group
Steel & Composite Structures
Copyright
© 2024 José Osvaldo Ferreira Filho, Luís Simões da Silva, T. Tankova, Hermes Carvalho
DOI related publication
https://doi.org/10.1016/j.jcsr.2024.108548
More Info
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Publication Year
2024
Language
English
Copyright
© 2024 José Osvaldo Ferreira Filho, Luís Simões da Silva, T. Tankova, Hermes Carvalho
Research Group
Steel & Composite Structures
Volume number
215
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Abstract

This paper aims to assess the influence of geometrical imperfections and residual stresses on the reliability of the stability design rules for steel columns in Eurocode 3 considering a full probabilistic approach and further validate the new buckling curves in the scope of the ongoing revision of the Structural Eurocodes. A reliability assessment of major- and minor-axis flexural buckling of high-strength steel (HSS) welded I-section columns was performed, considering all basic variables as random, including the geometrical and material imperfections, in addition to the material properties of steel and the geometry of the cross-section. An advanced finite element model calibrated with experimental test results is used to perform a very large (290,126 simulations) parametric study covering the majority of practical geometries. Subsequently, Monte Carlo simulation is used to estimate the design values of the buckling resistance that correspond to the target probability of failure of the Eurocodes. Finally, these values are compared to the proposed buckling curves for HSS columns, showing good agreement and supporting their adoption in the revised EN 1993–1-1. It is also concluded that it is on the safe side to carry out a reliability assessment with deterministic reference values for structural imperfections.