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单层网壳结构是缺陷敏感结构,经截面优化设计的单层网壳结构对初始几何缺陷分布形式更加敏感.在多种缺陷分布形式下,对截面优化后的网壳模型进行双重非线性整体稳定性分析,研究杆件截面取值与缺陷分布、结构极限承载力之间的关系.结果表明:截面优化寻优结果与初始几何缺陷分布有直接关系,增大缺陷较大处杆件截面能显著提高结构承载力;经截面优化设计的网壳仅在其设计初始几何缺陷下稳定承载力满足设计要求,在其他缺陷下承载力均下降明显.本文对这一现象进行了深入的研究,并通过优化“杆件分组”的方式改进了由截面优化设计导致的结构稳定承载能力对缺陷分布的高度敏感性,提高了结构整体稳定承载力的鲁棒性,同时降低了结构的耗钢量.
The single-layer reticulated shell structure is a defect-sensitive structure, and the single-layer reticulated shell structure optimized by cross-section is more sensitive to the initial geometric defect distribution.Under the various defect distribution forms, the double- Stability analysis, the relationship between the cross-section value and the defect distribution and the ultimate bearing capacity of the structure is studied.The results show that the optimal cross-section optimization results are directly related to the distribution of initial geometric defects, The reticulated shell with optimized section design can meet the design requirements only under the initial geometrical imperfections of its design, and its bearing capacity decreases obviously under other defects.In this paper, the phenomenon is studied in depth By optimizing the “rod grouping” method, the structural stability of the cross-section optimization design improves the sensitivity of the structure to the defect distribution, improves the robustness of the overall structural stability of the bearing capacity and reduces the consumption of structural steel the amount.