Hayalioglu, MSDegertekin, SO2024-04-242024-04-2420050045-79491879-2243https://doi.org/10.1016/j.compstruc.2005.02.009https://hdl.handle.net/11468/15285In this paper, an optimum design method is presented for non-linear steel frames with semi-rigid connections and semi-rigid column bases using a genetic algorithm. The design algorithm obtains the minimum total cost which comprises total member plus connection costs by selecting suitable sections from a standard set of steel sections such as American Institute of Steel Construction (AISC) wide-flange (W) shapes. A genetic algorithm is employed as optimization method which utilizes reproduction, crossover and mutation operators. Displacement and stress constraints of AISC-Load and Resistance Factor Design (LRFD) specification and also size constraints for beams and columns are imposed on the frame. The Frye and Morris polynomial model and also a linear spring model are used for semi-rigid connections and column bases respectively. Three design examples with various type of connections are presented. The designs obtained using AISC-LRFD code are compared to those where AISC-Allowable Stress Design (ASD) is considered. The comparisons show that the former code yields frames with less costs. Moreover, the semi-rigid connection and column base modelling is compared to rigid connection modelling. (c) 2005 Elsevier Ltd. All rights reserved.eninfo:eu-repo/semantics/closedAccessOptimizationGenetic AlgorithmSemi-Rigid ConnectionsSemi-Rigid Column BasesNon-Linear Steel FramesAiscLrfdAsdArticle8321-2218491863WOS:0002309944000122-s2.0-2044448289310.1016/j.compstruc.2005.02.009N/AQ2