Effect of serviceability limits on optimal design of steel portal frames

Duoc Phan, James Lim, Tiku Tanyimboh, Mark Lawson, Yixiang Xu, S Martin, Wei Sha

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

The design of hot-rolled steel portal frames can be sensitive to serviceability deflection limits. In such cases, in order to reduce frame deflections, practitioners increase the size of the eaves haunch and / or the sizes of the steel sections used for the column and rafter members of the frame. This paper investigates the effect of such deflection limits using a real-coded niching genetic algorithm (RC-NGA) that optimizes frame weight, taking into account both ultimate as well as serviceability limit states. The results show that the proposed GA is efficient and reliable. Two different sets of serviceability deflection limits are then considered: deflection limits recommended by the Steel Construction Institute (SCI), which is based on control of differential deflections, and other deflection limits based on suggestions by industry. Parametric studies are carried out on frames with spans ranging between 15 m to 50 m and column heights between 5 m to 10 m. It is demonstrated that for a 50 m span frame, use of the SCI recommended deflection limits can lead to frame weights that are around twice as heavy as compared to designs without these limits.
LanguageEnglish
Pages74–84
Number of pages11
JournalJournal of Constructional Steel Research
Volume86
DOIs
Publication statusPublished - Jul 2013

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Steel construction
Steel
Genetic algorithms
Industry
Optimal design

Keywords

  • optimization
  • hot-rolled steel
  • serviceability limits
  • portal frames
  • real coded niching GA

Cite this

Phan, Duoc ; Lim, James ; Tanyimboh, Tiku ; Lawson, Mark ; Xu, Yixiang ; Martin, S ; Sha, Wei. / Effect of serviceability limits on optimal design of steel portal frames. In: Journal of Constructional Steel Research. 2013 ; Vol. 86. pp. 74–84.
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abstract = "The design of hot-rolled steel portal frames can be sensitive to serviceability deflection limits. In such cases, in order to reduce frame deflections, practitioners increase the size of the eaves haunch and / or the sizes of the steel sections used for the column and rafter members of the frame. This paper investigates the effect of such deflection limits using a real-coded niching genetic algorithm (RC-NGA) that optimizes frame weight, taking into account both ultimate as well as serviceability limit states. The results show that the proposed GA is efficient and reliable. Two different sets of serviceability deflection limits are then considered: deflection limits recommended by the Steel Construction Institute (SCI), which is based on control of differential deflections, and other deflection limits based on suggestions by industry. Parametric studies are carried out on frames with spans ranging between 15 m to 50 m and column heights between 5 m to 10 m. It is demonstrated that for a 50 m span frame, use of the SCI recommended deflection limits can lead to frame weights that are around twice as heavy as compared to designs without these limits.",
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Effect of serviceability limits on optimal design of steel portal frames. / Phan, Duoc; Lim, James; Tanyimboh, Tiku; Lawson, Mark ; Xu, Yixiang; Martin, S; Sha, Wei.

In: Journal of Constructional Steel Research, Vol. 86, 07.2013, p. 74–84.

Research output: Contribution to journalArticle

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AU - Lawson, Mark

AU - Xu, Yixiang

AU - Martin, S

AU - Sha, Wei

N1 - NOTICE: This is the author’s version of a work that was accepted for publication in Journal of Constructional Steel Research. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published as: Effect of serviceability limits on optimal design of steel portal frames. / Phan, Duoc; Lim, James; Tanyimboh, Tiku; Lawson, Mark ; Xu, Yixiang; Martin, S; Sha, Wei. In: Journal of Constructional Steel Research, Vol. 86, 07.2013, p. 74–84. doi:10.1016/j.jcsr.2013.03.001

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AB - The design of hot-rolled steel portal frames can be sensitive to serviceability deflection limits. In such cases, in order to reduce frame deflections, practitioners increase the size of the eaves haunch and / or the sizes of the steel sections used for the column and rafter members of the frame. This paper investigates the effect of such deflection limits using a real-coded niching genetic algorithm (RC-NGA) that optimizes frame weight, taking into account both ultimate as well as serviceability limit states. The results show that the proposed GA is efficient and reliable. Two different sets of serviceability deflection limits are then considered: deflection limits recommended by the Steel Construction Institute (SCI), which is based on control of differential deflections, and other deflection limits based on suggestions by industry. Parametric studies are carried out on frames with spans ranging between 15 m to 50 m and column heights between 5 m to 10 m. It is demonstrated that for a 50 m span frame, use of the SCI recommended deflection limits can lead to frame weights that are around twice as heavy as compared to designs without these limits.

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