KT型相贯节点极限承载力非线性有限元分析

对KT型圆钢管空间相贯节点的极限承载力进行了非线性有限元分析,揭示了KT型相贯节点的受力性能.结果表明:随着支杆与弦杆直径比、腹杆与弦杆直径比、支杆与弦杆厚度比、腹杆与弦杆厚度比和弦杆径厚比的变化,节点发生弦杆局部屈曲模式和腹杆轴向屈曲破坏2种破坏模式;支杆弦杆直径比和支杆弦杆厚度比的变化对节点极限承载力没有显著影响;与规范中平面K型相贯节点计算结果的比值在0.75左右.

Nonlinear Finite Element Analysis of the Ultimate Strength on Tubular KT-Joints

A nonlinear finite-element analysis of multiplanar circular tubular KT-joints was carried out in this paper,and the behavior of the tubular KT-joints was described.The result showed that there were two failure modes of the joints with the variance of different joint parameters diameter ratio of branch to chord,diameter ratio of another branch to chord,thickness ratio of branch to chord,thickness ratio of another branch to chord and ratio of chord diameter to its thickness.These failure modes were branch failure and chord local buckling failure.Correspondingly,there was no a significant difference for ultimate strength when diameter ratio of branch to chord or thickness ratio of branch to chord varied.The ultimate strength of KT-joints was about 0.75 less than the K-joints.