Effect of serviceability limits on optimal design of steel portal frames

T. D. Phan, J. H Lim, J. B.P. Lim, W. Sha, T. T. Tanyimboh, M. Dundu

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The design of hot-rolled steel portal frames can be sensitive to serviceability deflections. In such cases, in order to reduce frame deflections, practitioners can increase the size of the haunch and/or the sizes of the steel standard sections used for the column and rafter members of the frame. This paper investigates the effect of such serviceability deflection on the optimal design of steel portal frames, using evolutionary algorithms that optimizes frame weight, taking into account both ultimate as well as serviceability limit states. The results show that heuristic search methods, namely, real-coded and real-coded niching genetic algorithms are efficient and reliable. The niching strategy results in a 66.7% reduction in the computational time. It is shown that serviceability deflections, as recommended by the Steel Construction Institute, govern the design of a 30 m span portal frame, where material cost increases by 27% compared to an ultimate limit state design only.

Original languageEnglish
Title of host publicationResearch and Applications in Structural Engineering, Mechanics and Computation - Proceedings of the 5th International Conference on Structural Engineering, Mechanics and Computation, SEMC 2013
Pages2123-2128
Number of pages6
Publication statusPublished - 09 Dec 2013
Event5th International Conference on Structural Engineering, Mechanics and Computation, SEMC 2013 - Cape Town, South Africa
Duration: 02 Sep 201304 Sep 2013

Conference

Conference5th International Conference on Structural Engineering, Mechanics and Computation, SEMC 2013
Country/TerritorySouth Africa
CityCape Town
Period02/09/201304/09/2013

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Mechanical Engineering

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