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研究了不同荷载布置形式、支承方式条件下,单层柱面网壳的抗连续倒塌性能和倒塌破坏模式,采用基于构件承载能力的敏感性评价指标,分析了初始缺陷、压杆失稳等因素对杆件、节点敏感性指标的影响。结果表明,当采用四边支承时,满跨均布荷载起控制作用,跨中节点为敏感构件,与之相邻斜杆为关键构件;当采用纵向两边支承时,半跨均布荷载起控制作用,杆件和节点的敏感性指标在1/3跨处最大,支座处最小。当考虑初始缺陷时,杆件、节点重要性系数分别增大了41%和53%;当考虑压杆失稳时,杆件和节点重要性系数分别增大了45%和62%。通过对关键构件进行加强,可以优化该类结构的抗连续倒塌性能。
The continuous collapse behavior and collapse failure mode of single-layer cylindrical reticulated shells under different loading arrangements and supporting conditions are studied. The sensitivity evaluation index based on component bearing capacity is used to analyze the factors such as initial defects and buckling instability Impact on bar and node sensitivity index. The results show that when the four-sided support is adopted, the full-span uniform load plays a control role and the mid-span node is the sensitive component, and the adjacent diagonal bars are the key components. When the longitudinal two-side support is adopted, the half-span uniform load plays a control role , The sensitivity index of the bar and the node is the largest at 1/3 span and the smallest at the support. When the initial defects are considered, the importance coefficients of the members and nodes increase by 41% and 53% respectively. When the failure of the stabilizer is considered, the importance coefficients of the members and joints increase by 45% and 62% respectively. By strengthening the key components, this kind of structure can be optimized for anti-continuous collapse performance.