Advanced design and optimization of steel portal frames

Petr Hradil, Matti Mielonen, Ludovic Fulop

Research output: Contribution to journalArticleScientificpeer-review

Abstract

This study brings new insights into the advantages of using more sophisticated design methods for steel portal frames (e.g. geometrically and materially nonlinear analysis with imperfections or GMNIA, and the general method introduced in Eurocode 3), compared to the commonly used member checks with interaction formulae. The differences between the design alternatives are discussed, focusing on assessing lateral-torsional stability, and the potential benefits of using advanced shell model instead of widely used beam elements. In addition to the advanced design methods, the topic of shape optimization of frames was explored using realcoded genetic algorithm (GA).
The developed optimisation tools highlight the possibility of using GA in everyday design in the future. The results of the study clearly point to the advantages of using advanced modelling, e.g. GMNIA, instead of the classical member checks. While both methods are accepted by the current steel design code EN 1993, using GMNIA can result in important savings, because it eliminates some of the conservativeness brought in by the unavoidable simplifications of the other methods. The experience shows that using complex 3D models is possible with current computational capabilities.
Original languageEnglish
Pages (from-to)44-60
JournalRakenteiden Mekaniikka
Volume43
Issue number1
Publication statusPublished - 2010
MoE publication typeA1 Journal article-refereed

Fingerprint

Steel
Genetic algorithms
Shape optimization
Nonlinear analysis
Defects

Keywords

  • portal frames
  • genetic algorithm
  • general method
  • lateral-torsional stability

Cite this

@article{3414b43468df431096038e8886fdc997,
title = "Advanced design and optimization of steel portal frames",
abstract = "This study brings new insights into the advantages of using more sophisticated design methods for steel portal frames (e.g. geometrically and materially nonlinear analysis with imperfections or GMNIA, and the general method introduced in Eurocode 3), compared to the commonly used member checks with interaction formulae. The differences between the design alternatives are discussed, focusing on assessing lateral-torsional stability, and the potential benefits of using advanced shell model instead of widely used beam elements. In addition to the advanced design methods, the topic of shape optimization of frames was explored using realcoded genetic algorithm (GA).The developed optimisation tools highlight the possibility of using GA in everyday design in the future. The results of the study clearly point to the advantages of using advanced modelling, e.g. GMNIA, instead of the classical member checks. While both methods are accepted by the current steel design code EN 1993, using GMNIA can result in important savings, because it eliminates some of the conservativeness brought in by the unavoidable simplifications of the other methods. The experience shows that using complex 3D models is possible with current computational capabilities.",
keywords = "portal frames, genetic algorithm, general method, lateral-torsional stability",
author = "Petr Hradil and Matti Mielonen and Ludovic Fulop",
note = "Project code: 12596",
year = "2010",
language = "English",
volume = "43",
pages = "44--60",
journal = "Rakenteiden Mekaniikka",
issn = "0783-6104",
number = "1",

}

Advanced design and optimization of steel portal frames. / Hradil, Petr; Mielonen, Matti; Fulop, Ludovic.

In: Rakenteiden Mekaniikka, Vol. 43, No. 1, 2010, p. 44-60.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Advanced design and optimization of steel portal frames

AU - Hradil, Petr

AU - Mielonen, Matti

AU - Fulop, Ludovic

N1 - Project code: 12596

PY - 2010

Y1 - 2010

N2 - This study brings new insights into the advantages of using more sophisticated design methods for steel portal frames (e.g. geometrically and materially nonlinear analysis with imperfections or GMNIA, and the general method introduced in Eurocode 3), compared to the commonly used member checks with interaction formulae. The differences between the design alternatives are discussed, focusing on assessing lateral-torsional stability, and the potential benefits of using advanced shell model instead of widely used beam elements. In addition to the advanced design methods, the topic of shape optimization of frames was explored using realcoded genetic algorithm (GA).The developed optimisation tools highlight the possibility of using GA in everyday design in the future. The results of the study clearly point to the advantages of using advanced modelling, e.g. GMNIA, instead of the classical member checks. While both methods are accepted by the current steel design code EN 1993, using GMNIA can result in important savings, because it eliminates some of the conservativeness brought in by the unavoidable simplifications of the other methods. The experience shows that using complex 3D models is possible with current computational capabilities.

AB - This study brings new insights into the advantages of using more sophisticated design methods for steel portal frames (e.g. geometrically and materially nonlinear analysis with imperfections or GMNIA, and the general method introduced in Eurocode 3), compared to the commonly used member checks with interaction formulae. The differences between the design alternatives are discussed, focusing on assessing lateral-torsional stability, and the potential benefits of using advanced shell model instead of widely used beam elements. In addition to the advanced design methods, the topic of shape optimization of frames was explored using realcoded genetic algorithm (GA).The developed optimisation tools highlight the possibility of using GA in everyday design in the future. The results of the study clearly point to the advantages of using advanced modelling, e.g. GMNIA, instead of the classical member checks. While both methods are accepted by the current steel design code EN 1993, using GMNIA can result in important savings, because it eliminates some of the conservativeness brought in by the unavoidable simplifications of the other methods. The experience shows that using complex 3D models is possible with current computational capabilities.

KW - portal frames

KW - genetic algorithm

KW - general method

KW - lateral-torsional stability

M3 - Article

VL - 43

SP - 44

EP - 60

JO - Rakenteiden Mekaniikka

JF - Rakenteiden Mekaniikka

SN - 0783-6104

IS - 1

ER -