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摘要
Here, through inequality iterative analysis for load-bearing capacity relations of different components in structure, a yield mechanism control method for steel concentrically braced frame was established. Combined with the improved genetic algorithm, a structural optimization analysis method based on yield mechanism control was proposed taking the total weight of structure as the objective function. Through existing tests, 48 finite element models and multiple actual examples of centrally supported steel frame structure, computational efficiencies and accuracies of the structural yield mechanism control method and the proposed optimization method were verified and analyzed, respectively. The results showed that the yield mechanism control method can ensure structural components yielding according to the preset sequence; in practical applications, it is inappropriate to select range edge parameters with higher sensitivity, but parameters of support cross-section with larger outer diameter should be selected within parametric ranges to avoid premature yielding of compressed braces; adopting parametric ranges for optimization analysis can effectively reduce initial solution domain of optimization search and improve computational efficiency of optimization analysis. ? 2023 Chinese Vibration Engineering Society.
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