Optimum design of cold-formed steel portal frame buildings including joint effects and secondary members

Duoc T. Phan, James B.P. Lim, Tiku T. Tanyimboh, Wei Sha

Research output: Contribution to journalArticle

Abstract

In steel portal frames, cold-formed steel channel sections are increasingly used as the primary framing components, in addition to the secondary members e.g. purlins and side rails. For such framing systems, the stiffness of the joints at the eaves and apex affects the bending moment distribution, as well as the frame deflections. This paper investigates the influence of two joint configurations having full rigidity and semirigidity, respectively, on the optimum design of cold-formed steel portal frames. A real-coded genetic algorithm is used to search for the most cost-effective design. It is shown that through incorporating joint effects explicitly into the design process, a more appropriate balance between the joints and the member properties can be obtained, thus optimizing material use. The study then investigates the effect of secondary members on the optimum design. It is shown that incorporating the secondary members is important for portal frames having spans less than 12 m. For example, for a frame spacing less than 6 m, the material cost of the primary members can be reduced by up to 15%.
LanguageEnglish
JournalInternational Journal of Steel Structures
Publication statusAccepted/In press - 10 Oct 2016

Fingerprint

Steel
Bending moments
Rigidity
Rails
Costs
Genetic algorithms
Stiffness
Optimum design

Keywords

  • cold-formed steel
  • portal frames
  • optimisation
  • real-coded genetic algorithm

Cite this

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title = "Optimum design of cold-formed steel portal frame buildings including joint effects and secondary members",
abstract = "In steel portal frames, cold-formed steel channel sections are increasingly used as the primary framing components, in addition to the secondary members e.g. purlins and side rails. For such framing systems, the stiffness of the joints at the eaves and apex affects the bending moment distribution, as well as the frame deflections. This paper investigates the influence of two joint configurations having full rigidity and semirigidity, respectively, on the optimum design of cold-formed steel portal frames. A real-coded genetic algorithm is used to search for the most cost-effective design. It is shown that through incorporating joint effects explicitly into the design process, a more appropriate balance between the joints and the member properties can be obtained, thus optimizing material use. The study then investigates the effect of secondary members on the optimum design. It is shown that incorporating the secondary members is important for portal frames having spans less than 12 m. For example, for a frame spacing less than 6 m, the material cost of the primary members can be reduced by up to 15{\%}.",
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Optimum design of cold-formed steel portal frame buildings including joint effects and secondary members. / Phan, Duoc T.; Lim, James B.P.; Tanyimboh, Tiku T.; Sha, Wei.

In: International Journal of Steel Structures, 10.10.2016.

Research output: Contribution to journalArticle

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AU - Lim, James B.P.

AU - Tanyimboh, Tiku T.

AU - Sha, Wei

PY - 2016/10/10

Y1 - 2016/10/10

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AB - In steel portal frames, cold-formed steel channel sections are increasingly used as the primary framing components, in addition to the secondary members e.g. purlins and side rails. For such framing systems, the stiffness of the joints at the eaves and apex affects the bending moment distribution, as well as the frame deflections. This paper investigates the influence of two joint configurations having full rigidity and semirigidity, respectively, on the optimum design of cold-formed steel portal frames. A real-coded genetic algorithm is used to search for the most cost-effective design. It is shown that through incorporating joint effects explicitly into the design process, a more appropriate balance between the joints and the member properties can be obtained, thus optimizing material use. The study then investigates the effect of secondary members on the optimum design. It is shown that incorporating the secondary members is important for portal frames having spans less than 12 m. For example, for a frame spacing less than 6 m, the material cost of the primary members can be reduced by up to 15%.

KW - cold-formed steel

KW - portal frames

KW - optimisation

KW - real-coded genetic algorithm

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JO - International Journal of Steel Structures

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