Optimum design of steel space frames with composite beams using genetic algorithm

ARTAR M., Daloglu A.

STEEL AND COMPOSITE STRUCTURES, vol.19, no.2, pp.503-519, 2015 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 19 Issue: 2
  • Publication Date: 2015
  • Doi Number: 10.12989/scs.2015.19.2.503
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.503-519
  • Keywords: genetic algorithm, weight optimization, space frame, composite beams, fem analysis, OPTIMIZATION ALGORITHM, DISCRETE OPTIMIZATION, TRUSS STRUCTURES, CONSTRAINTS
  • Karadeniz Technical University Affiliated: Yes


This paper presents an optimization process using Genetic Algorithm (GA) for minimum weight by selecting suitable standard sections from a specified list taken from American Institute of Steel Construction (AISC). The stress constraints obeying AISC-LRFD (American Institute of Steel Construction - Load and Resistance Factor Design), lateral displacement constraints being the top and inter-storey drift, mid-span deflection constraints for the beams and geometric constraints are considered for optimum design by using GA that mimics biological processes. Optimum designs for three different space frames taken from the literature are carried out first without considering concrete slab effects in finite element analyses for the constraints above and the results are compared with the ones available in literature. The same optimization procedures are then repeated for the case of space frames with composite (steel and concrete) beams. A program is coded in MATLAB for the optimization processes. Results obtained in the study showed that consideration of the contribution of the concrete on the behavior of the floor beams results with less steel weight and ends up with more economical designs.