Publication result detail

Imperfection sensitivity analysis of steel columns at ultimate limit state

KALA, Z.; VALEŠ, J.

Original Title

Imperfection sensitivity analysis of steel columns at ultimate limit state

English Title

Imperfection sensitivity analysis of steel columns at ultimate limit state

Type

WoS Article

Original Abstract

The present paper applies Sobol's variance-based global sensitivity analysis (SSA) to quantify the contribution of input imperfections to the load-carrying capacity (LCC) of an IPN 200 steel compressed member. LCC is evaluated using the geometrically and materially non-linear finite element solution with regard to the effects of initial random imperfections including residual stresses. Comparison of results of SSA for (i) buckling about the minor principal axis, (ii) buckling about the major principal axis and (iii) lateral–torsional buckling due to bending moment is performed on the non-dimensional slenderness interval of 0–2. SSA for (i) and (ii) is performed for steel grade (a) S235 and (b) S355, SSA for (iii) is performed only for steel grade S235. SSA found similarities in results (ia) and (ib), (iia) and (iib) and identified significant differences between results (ia) and (iiia), (iia) and (iiia), where sensitivity to the initial axial curvature is more than two times higher in (ia) than in (iiia). The relationships between the effects of initial imperfections on LCC and the design criteria of reliability of Eurocode 3 are discussed.

English abstract

The present paper applies Sobol's variance-based global sensitivity analysis (SSA) to quantify the contribution of input imperfections to the load-carrying capacity (LCC) of an IPN 200 steel compressed member. LCC is evaluated using the geometrically and materially non-linear finite element solution with regard to the effects of initial random imperfections including residual stresses. Comparison of results of SSA for (i) buckling about the minor principal axis, (ii) buckling about the major principal axis and (iii) lateral–torsional buckling due to bending moment is performed on the non-dimensional slenderness interval of 0–2. SSA for (i) and (ii) is performed for steel grade (a) S235 and (b) S355, SSA for (iii) is performed only for steel grade S235. SSA found similarities in results (ia) and (ib), (iia) and (iib) and identified significant differences between results (ia) and (iiia), (iia) and (iiia), where sensitivity to the initial axial curvature is more than two times higher in (ia) than in (iiia). The relationships between the effects of initial imperfections on LCC and the design criteria of reliability of Eurocode 3 are discussed.

Keywords

Sobol sensitivity analysis, Steel structure, Buckling, Imperfections, Finite element

Key words in English

Sobol sensitivity analysis, Steel structure, Buckling, Imperfections, Finite element

Authors

KALA, Z.; VALEŠ, J.

RIV year

2019

Released

01.10.2018

ISBN

1644-9665

Periodical

Archives of Civil and Mechanical Engineering

Volume

18

Number

4

State

Republic of Poland

Pages from

1207

Pages to

1218

Pages count

12

BibTex

@article{BUT151670,
  author="Zdeněk {Kala} and Jan {Valeš}",
  title="Imperfection sensitivity analysis of steel columns at ultimate limit state",
  journal="Archives of Civil and Mechanical Engineering",
  year="2018",
  volume="18",
  number="4",
  pages="1207--1218",
  doi="10.1016/j.acme.2018.01.009",
  issn="1644-9665"
}