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Objective . The purpose of the study is to develop design and calculation schemes that can be used in the design of bistal load-bearing structures, ensuring optimization of their parameters by using steels of different strengths. Method . The research is based on the theory and methods of structural optimization. Result . Rational structural diagrams of beam structures and stepped columns of industrial buildings have been developed and assembled. Using individual examples, the consumption of metal and its cost are examined for various options for the layout of beams and columns. The necessary calculation formulas and recommendations are given that can be used in the practice of design and construction of metal beams and columns. Conclusion . The constructed structural diagrams and calculation algorithm indicate the effectiveness of using steels of different strengths in the design of beams and columns.
Yusupov et al. (Sun,) studied this question.