Two-phase genetic algorithm for topology optimization of free-form steel space-frame roof structures with complex curvatures

•A two-phase genetic algorithm is presented for simultaneous sizing and topology optimization of free-form steel space frame roof structures.•The topology optimization algorithm is applied to two real-life space roof structures.•Algorithm is effective for minimum weight design of structures with complex curvatures.

A two-phase genetic algorithm is presented for simultaneous sizing and topology optimization of free-form steel space frame roof structures consisting of discrete commercially available rectangular hollow structural sections. The algorithm is applied to two real-life space roof structures intended for Ottawa Light Rail Transit (OLRT). It is shown that the algorithm is effective for topology optimization of real-life roof structures with complex curvatures in multiple planes.

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