中文摘要：

以XKK型空间相贯节点为例,应用有限元分析法对多组不同几何特性的XKK型节点进行比较,研究了影响空间节点承载力的主要参数、参数与承载力的关系以及几何特性对空间相贯节点承载力的影响,并对典型XKK型节点进行了弹塑性全过程屈曲分析,揭示了空间相贯节点塑性区的开展过程、应变分布规律及节点破坏模式.结果表明：提高支管与主管管径比、腹管与主管管径比可有效提高节点承载力;空间节点各管相贯角度对节点承载力影响较小;各管件径厚比宜控制在15-20之间;主管受压时其应力比不宜超过0.6;空间相贯节点具有较好的塑性变形能力,其破坏模式与节点几何特性密切相关.

英文摘要：

Several groups of XKK joints with different geometric characteristics were analyzed.The influence of geometric parameters on the ultimate strength was investigated and explained graphically.The elasto-plastic finite element analysis（FEA） was performed for the circular tubular XKK-Joints to demonstrate the strength capacity,plastic development zone,destruction forms,and stress-strain distribution status of the connections.The results indicate that the bearing capacity of XKK joints can be improved by the increasing of the diameter ratio of branch to chord or the diameter ratio of another branch to chord.The angles of branch-chord and branch-branch have slight influence on bearing capacity.The ratio of diameter to thickness should be controlled within 15 to 20 with the axial compressive force coefficient of chord-tube less than 0.6.The destruction forms of spatial penetrated joints are closely related to the geometric characteristics with good plastic deformation capacity.