Minimum cost design of steel frames with semi-rigid connections and column bases via genetic optimization

Harmony search-based algorithm is developed to determine the minimum cost design of steel frames with semi-rigid connections and column bases under displacement, strength and size constraints. Harmony search (HS) is recently developed metaheuristic search algorithm which is based on the analogy between the performance process of natural music and searching for solutions of optimum design problems. The geometric non-linearity of the frame members, the semi-rigid behaviour of the beam-to-column connections and column bases are taken into account in the design algorithm. The results obtained by semi-rigid connection and column base modelling are also compared to one developed by rigid connection modelling. The efficiency of HS algorithm, in comparison with genetic algorithms (GAs), is verified with three benchmark examples. The results indicate that HS could obtain lighter frames and less cost values than those developed using GAs.

Harmony search algorithm for minimum cost design of steel frames with semi-rigid connections and column bases

A genetic-algorithm-based optimum design method is presented for non-linear steel frames with semi-rigid connections and column bases. 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 the optimization method, which utilizes reproduction, crossover and mutation operators. Displacement and stress constraints of AISC Allowable Stress Design (ASD) specification and size constraints for beams and columns are imposed on the frame. The algorithm requires a large number of non-linear analyses of frames. The analyses cover both the non-linear behavior of beam-to-column connection and P-Δ effects of beam-column members. The Frye and Morris polynomial model is used for modeling semi-rigid connections. Two design examples with various types of connections are presented to demonstrate the application of the algorithm. The semi-rigid connection and column base modeling results in more economical solutions than rigid connection modeling, but increases the sway of frames.

Design of non-linear steel frames for stress and displacement constraints with semi-rigid connections via genetic optimization

Frame structures: global performance, static and stability behaviour

Buckling analysis of braced and unbraced steel frames exposed to fire

Numerical study of unbraced composite frames: generation of data to validate use of the wind moment method of design

Previous studies of the behaviour of steel column base connections are reviewed; attention is concentrated on the results from programmes of laboratory testing. Nominally pinned bases are shown to provide significant rotational restraint and to be capable of transferring quite large moments into the foundations. Ways of representing these effects in frame analysis are investigated and, based on sample studies, a recommendation is provided.

Utilisation of Test Data for Column Bases When Assessing Overall Frame Response: A Review

Design of Composite Sway Frames

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Papers

Numerical study of unbraced composite frames: generation of data to validate use of the wind moment method of design

Utilisation of Test Data for Column Bases When Assessing Overall Frame Response: A Review

Design of Composite Sway Frames