复杂加劲C形截面轴心受压构件优化设计

OPTIMAL DESIGN OF AXIAL COMPRESSION C-SECTION MEMBERS WITH COMPLEX STIFFENERS

  • 摘要: 工程结构优化对节省基建投资、提升结构效用、推进节能减排都起到很大作用。而冷弯型钢特殊的工业化加工方式,满足了可以从截面层面就开始的优化。本文提供了对冷弯C形截面的加劲优化。基于传统的弹性屈曲性能计算方法,考虑变形特点,对有限条的模态识别方法进行改进,克服了面对复杂截面时模态识别的不足,并借此编制了基于变形的改进有限条程序;基于改进有限条法计算弹性屈曲结果,对直接强度法进行了基于复杂加劲截面计算的修正;基于遗传算法,编制优化程序,并提供了角形加劲、帽形加劲和复杂卷边加劲的优化结果。本文提供的优化方法能够为材料利用效率的提高和建造成本的降低提供便捷的途径。

     

    Abstract: The optimization of engineering structures plays a great role in saving infrastructure investment, improving structural effectiveness, and promoting energy conservation and emission reduction. The special industrial processing method of cold-formed steel meets the optimization requirements starting from the section level. The stiffening optimization of cold-formed C-section is provided. Based on the traditional calculation method of elastic buckling performance and the deformation characteristics, the new mode identification method of finite strip is improved to overcome the deficiency of complex cross-section mode identification, and the modified finite strip program based on deformation is compiled. Based on the improved elastic buckling results of finite element method, the complex stiffening section direct strength method is modified. Based on genetic algorithm, the optimization program is developed, and the optimization results of corner stiffening, hat stiffening and complex curling stiffening are provided. The optimization method provided in this paper can provide a convenient way to improve the material utilization efficiency and reduce the construction cost.

     

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