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应用有限元分析方法对XKK型空间相贯节点进行全过程屈曲分析,揭示了相贯节点塑性区的扩展过程和节点区应变分布状态及破坏模式。通过对多组不同几何特性的XKK型节点进行对比分析,揭示了影响空间节点相贯承载力的主要参数以及其与承载力的关系,并将有限元计算结果与规范计算结果进行了对比。结果显示:支、主管管径比1β及腹、主管管径比2β的增大可有效提高节点承载力;各杆杆夹角对节点承载力影响较小;杆件径厚比iγ宜控制在一定范围之内。在参考平面X型,K型相贯节点承载力计算公式及相关资料的基础上,提出了XKK空间相贯节点承载力计算建议公式。
The full-process buckling analysis of XKK-type space intersection joints is carried out by using finite element analysis method. The expansion process of plastic zone and the distribution of strain state and failure mode in node area are revealed. By comparing and analyzing many sets of XKK nodes with different geometrical characteristics, the main parameters that affect the bearing capacity of space nodes and the relationship between XKK nodes and bearing capacity are revealed. The results of the finite element analysis are compared with those of the canonical calculation. The results showed that the increase of branch-and-main tube diameter ratio 1β, the ratio of tube diameter to tube diameter 2β could effectively increase the node bearing capacity, and the angle of each pole had little effect on the node bearing capacity. Within a certain range. Based on the calculation formulas of the bearing capacity of X-type and K-type cross-joints and the related data, the proposed formulas for calculating the bearing capacity of XKK space joints are proposed.