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Structural steel is most commonly used in large-span buildings such as industrial buildings, exhibitions, theaters, gymnasiums, and stadiums because of its advantages including high strength, lightweight. The portal frame is the most popular structure which is normally applied to industrial buildings up to 40 m span. This article presents a study on the weight optimization of steel truss frames. The optimization process based on differential evolution algorithm, is implemented by VBA language. The design variables are the cross-section dimensions of column and truss members, the objective function is the weight of the truss frame while the design constraint includes satisfying both of ultimate limit state and serviceability limit state. The design constraints are checked using the software CSI SAP2000. An example is then conducted to demonstrate the applicability of the developed program. Moreover, a survey is carried out by changing the shape of the truss and the configuration of the web members. The purpose of the survey is to find the most suitable shape for this kind of structure.

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