输电钢管塔空间KK型管板连接节点极限承载力

Ultimate strength analysis of KK-type tube-gusset plate connections in transmission steel tubular tower

空间KK型管板连接节点作为输电钢管塔中最主要的节点型式,其安全性是整个塔架结构安全的重要保证。相比较于平面K型节点,在考虑实际结构中节点空间效应后的KK型节点的受力性能更为复杂。在平面K型管板节点的试验研究基础上,对两类空间KK型管板节点展开参数化分析,重点讨论了节点几何尺寸参数和主管轴压应力比等因素对节点极限承载力的影响变化规律。结合大量有限元参数分析所得计算结果,并综合考虑各种因素对节点极限承载力的影响,提出了空间KK型管板连接节点在主管管壁局部屈曲破坏模式下的极限承载力建议计算方法。

Multiplanar KK-type tube-gusset plate connections are the main joint types in transmission steel tubular tower,the safety of the joints are critical to the entire tower.Compared to K-joints,the mechanic characteristics of KK-joints are more complex after considering the multiplanar effects in the actual structure.Based on the bearing capacity test of K-type tube-gusset plate connections,parameterization analysis on the two kinds KK-type tube-gusset plate connections are conducted respectively,the geometric parameters and the axial force of the main tube together with other factors on the influence of the ultimate bearing capacity of multiplanar KK-joints are studied in detail.According to the results of large scale finite element parametric analysis,and considering the influence of various factors on the ultimate strength of the joints,calculation formulas of KK-type tube-gusset plate connections ultimate bearing capacity are proposed.